CN112226209B - Preparation and Application of Hollow Tubular Conductive Polymer Composite Fiber Aerogel Materials - Google Patents
Preparation and Application of Hollow Tubular Conductive Polymer Composite Fiber Aerogel Materials Download PDFInfo
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- 238000000034 method Methods 0.000 claims description 16
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
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- 239000011259 mixed solution Substances 0.000 claims description 12
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims description 10
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 claims description 10
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- 238000006243 chemical reaction Methods 0.000 claims description 9
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- 238000004108 freeze drying Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- BGHCVCJVXZWKCC-UHFFFAOYSA-N tetradecane Chemical compound CCCCCCCCCCCCCC BGHCVCJVXZWKCC-UHFFFAOYSA-N 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012520 frozen sample Substances 0.000 claims description 7
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 6
- 229920000123 polythiophene Polymers 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 229930192474 thiophene Natural products 0.000 claims description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005470 impregnation Methods 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 claims 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 abstract description 2
- 239000012510 hollow fiber Substances 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 11
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- 230000008014 freezing Effects 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
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- 238000005338 heat storage Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
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- 125000000524 functional group Chemical group 0.000 description 3
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- 239000002028 Biomass Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
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- 238000001000 micrograph Methods 0.000 description 2
- RZJRJXONCZWCBN-UHFFFAOYSA-N octadecane Chemical compound CCCCCCCCCCCCCCCCCC RZJRJXONCZWCBN-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
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- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000006262 metallic foam Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229940038384 octadecane Drugs 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Silicon Compounds (AREA)
- Inorganic Fibers (AREA)
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Abstract
本发明公开了一种中空管状导电聚合物复合纤维气凝胶的制备方法，属于新型复合材料领域。将导电聚合物在天然木棉纤维的内外壁上原位聚合，形成导电聚合物涂层，后通过再组装形成中空管状导电聚合物复合纤维气凝胶，将该气凝胶与有机相变材料结合获得复合相变材料。本发明的优点在于导电聚合物复合纤维气凝胶的制备工艺简单，原料为天然中空纤维廉价易得，绿色环保；制备得到的中空管状导电聚合物复合纤维气凝胶密度低，孔隙率高；气凝胶复合相变材料无泄漏，相变潜热高，热导率高，具有很好的热循环稳定性，为其在储能、电极、催化等领域的应用打下基础。
The invention discloses a preparation method of a hollow tubular conductive polymer composite fiber aerogel, which belongs to the field of novel composite materials. The conductive polymer is in-situ polymerized on the inner and outer walls of natural kapok fibers to form a conductive polymer coating, and then reassembled to form a hollow tubular conductive polymer composite fiber aerogel, which is combined with an organic phase change material A composite phase change material is obtained. The advantages of the invention are that the preparation process of the conductive polymer composite fiber aerogel is simple, the raw material is natural hollow fiber, which is cheap and easy to obtain, and is environmentally friendly; the prepared hollow tubular conductive polymer composite fiber aerogel has low density and high porosity; The aerogel composite phase change material has no leakage, high latent heat of phase change, high thermal conductivity, and good thermal cycle stability, which lays the foundation for its application in energy storage, electrodes, catalysis and other fields.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a preparation method of a hollow tubular conductive polymer composite fiber aerogel and an energy storage application thereof.
Background
The organic phase-change material is widely applied to the field of phase-change energy storage as a material with high heat storage density, stable chemical performance, no toxicity and no corrosiveness. Common organic phase change materials include paraffins, alkanes, unsaturated alcohols, fatty acids, and the like. However, the organic phase change material is easy to leak in the solid-liquid phase change process, so that the repeatable utilization rate of the material is reduced, and in addition, the organic phase change material generally has the defects of poor heat conductivity and low thermal conductivity.
At present, a porous network structure material and an organic phase change material are often selected to prevent the organic phase change material from leaking, the porous material is selected to contain aerogel materials, metal foams, polymer networks and the like, a heat conducting medium and the organic phase change material are often combined to improve the heat conductivity of the composite material in the aspect of improving the heat conducting performance, and the common heat conducting medium is carbon materials, metals, conductive polymers and the like. However, the preparation process of the porous material is generally complicated, the application of the phase-change material is limited, the improvement of the thermal conductivity of the composite material is limited due to the direct addition of a small amount of the heat-conducting medium, and the excessive addition of the heat-conducting medium can reduce the heat storage density of the composite phase-change material and the heat storage performance of the composite phase-change material.
Kapok fiber is a natural biomass material with a hollow tubular structure, can be polymerized on the inner wall and the outer wall of a hollow pipeline to form a conductive polymer coating, the kapok fiber modified by the conductive polymer coating is prepared into a porous aerogel structure to form hollow tubular conductive polymer composite fiber aerogel, and the aerogel material is combined with an organic phase-change material, so that the leakage of the organic phase-change material in a solid-liquid phase-change process can be prevented, the heat conduction performance of the composite phase-change material can be improved, and meanwhile, higher phase-change material load rate and heat storage density can be kept. The hollow tubular conductive polymer composite fiber aerogel has good conductive and heat-conducting properties, and can be widely applied to the fields of energy storage materials, electrode materials, catalytic materials and the like.
Disclosure of Invention
The invention aims to provide a method for preparing a hollow tubular conductive polymer composite fiber aerogel and a phase-change composite material thereof. Taking natural kapok fibers with a hollow tubular structure as a template, carrying out in-situ oxidative polymerization on the inner wall and the outer wall of a kapok fiber pipeline to generate a continuous conductive polymer coating, and assembling the kapok fibers modified by the conductive polymer coating to generate the hollow tubular conductive polymer composite fiber aerogel. The composite fiber aerogel is used for effectively loading the phase-change material by a melt impregnation method, a solution impregnation method and the like to obtain the composite phase-change material. The preparation method adopts natural biomass as a template, has wide raw material source, low cost, simple process, no pollution and easy large-scale industrial production.
The invention also aims to provide a hollow tubular conductive polymer composite fiber aerogel and a phase-change composite material thereof. The obtained aerogel material successfully reserves the hollow tubular structure of the kapok fiber, the porosity of the aerogel can be greatly improved, meanwhile, the kapok fiber modified by the conductive polymer coating is mutually overlapped to form the aerogel with a three-dimensional porous network structure, a heat conduction and electric conduction channel and rich organic functional groups containing oxygen, nitrogen, sulfur and the like are provided, and the composite fiber aerogel material has the characteristics of low density, high porosity, large pore volume and rich functional groups. The obtained composite phase change material has high load rate, large latent heat of phase change, high thermal conductivity and good thermal cycle stability.
The invention discloses a preparation method of a hollow tubular conductive polymer composite fiber aerogel, which is implemented by the following technical scheme: adopting natural kapok fiber with a hollow tubular structure as a template, and carrying out pretreatment on the template by a solvent or a chemical method to remove lipid on the surface of the kapok fiber so as to obtain the kapok fiber with good hydrophilicity; adding conductive polymer monomers such as pyrrole, aniline and thiophene and an oxidant, and carrying out in-situ oxidative polymerization on the inner and outer tube walls of the kapok fiber to generate conductive polymer coatings such as polypyrrole, polyaniline and polythiophene; then assembling the kapok fiber modified by the conductive polymer coating, and then obtaining hollow tubular conductive polymer composite aerogel by a freeze-drying method; and loading the organic phase-change material in the composite aerogel by adopting a melt impregnation method, a solution method and the like to obtain the composite phase-change material, and inspecting the energy storage efficiency and the heat conduction performance of the composite phase-change material.
The preparation method of the hollow tubular conductive polymer composite fiber aerogel specifically comprises the following steps:
step 1: soaking the kapok fiber in 0.1-10wt% sodium hydroxide solution, treating at 20-120 deg.c for 10-240min to eliminate fiber surface lipid, washing with ethanol and water separately, and drying to obtain hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of conductive polymer monomer and oxidant into the solution, fully mixing and reacting for 0.5-24h at-10-120 ℃ to ensure that the conductive polymer monomer is oxidized and polymerized on the inner and outer pipe walls of the kapok fiber, and filtering after the reaction is finished to obtain the conductive polymer coating modified kapok fiber.
And step 3: in order to obtain hollow tubular conductive polymer composite fiber aerogels with different densities, kapok fibers modified by the conductive polymer coating obtained in the above steps are fully mixed with water according to the mass ratio of 1:5-100, physical crosslinking is formed among the fibers, then liquid nitrogen is used for quickly freezing the mixed solution, and the frozen sample is subjected to freeze drying to obtain the hollow tubular conductive polymer composite fiber aerogels with low density and high porosity.
And 4, step 4: and (3) efficiently compounding the hollow tubular conductive polymer composite fiber aerogel obtained in the step (3) with an organic phase change material under the vacuum condition of 60-200 ℃ to obtain the shaped composite phase change material with enhanced heat conductivity.
Further, the conductive polymer monomer includes: pyrrole, aniline, thiophene.
Further, the initiator comprises: ferric salts such as ferric chloride, ferric sulfate and ferric nitrate, peroxides such as ammonium persulfate and potassium persulfate.
Further, the organic phase change material comprises: paraffin, octadecanoic acid, tetradecanoic acid, octadecanol, polyethylene glycol with different molecular masses, octadecane, tetradecane and the like.
The invention has the following remarkable advantages:
(1) the preparation raw materials of the hollow tubular conductive polymer composite fiber aerogel are green, cheap and easily available, the preparation process is simple, convenient and easy to operate, the preparation process is environment-friendly and pollution-free, and the large-scale production is easy to realize.
(2) This hollow tubular conductive polymer composite fiber aerogel has kept the original hollow pipeline structure of kapok fiber, and its low density, high porosity characteristic can ensure the high load factor of organic phase change material, promote composite phase change material's heat-retaining density, can effectively prevent organic phase change material at the emergence of revealing of solid-liquid phase change in-process simultaneously, improve composite phase change material's structural stability.
(3) The hollow tubular conductive polymer composite fiber aerogel prepared by the method is in a three-dimensional porous network structure formed by mutually lapping kapok fibers modified by a conductive polymer coating, effectively provides a heat conduction and electric conduction channel, and organic functional groups rich in oxygen, nitrogen, sulfur and the like on the surface can further take charge of other catalytic materials and energy materials, so that a foundation is laid for the application of the hollow tubular conductive polymer composite fiber aerogel in the fields of energy storage, electrodes, catalysis and the like.
(4) The conductive polymer composite aerogel has good light-heat conversion characteristics, and the composite phase-change material is endowed with the same high-efficiency light-heat conversion function.
Drawings
FIG. 1 is a scanning electron micrograph of a hollow kapok fiber according to example 1 of the present invention.
Fig. 2 is a scanning electron microscope image of the hollow tubular conductive polymer composite aerogel obtained in example 1 of the present invention.
FIG. 3 is a scanning electron microscope image of the composite phase change material obtained in example 2 of the present invention.
FIG. 4 is a DSC chart of the composite phase change material obtained in example 2 of the present invention.
Detailed Description
In order to make the features and advantages of the present invention more obvious, the following embodiments are further described.
Example 1
Step 1: soaking the kapok fiber in a sodium hydroxide solution with the mass concentration of 1wt%, treating at 20 ℃ for 10min to remove lipid on the surface of the fiber, then washing with ethanol and water respectively, and drying to obtain the hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of pyrrole monomer and ferric chloride into the solution, fully mixing and reacting for 0.5h at-10 ℃ so that the pyrrole monomer is oxidized and polymerized on the inner and outer tube walls of the kapok fiber, and filtering after the reaction is finished to obtain the polypyrrole coating modified kapok fiber.
And step 3: fully mixing the polypyrrole coating modified kapok fibers obtained in the step with water according to the mass ratio of 1:5 to form a uniform mixed solution, quickly freezing the mixed solution by using liquid nitrogen, and freeze-drying the frozen sample to obtain the hollow tubular polypyrrole composite fiber aerogel with low density and high porosity.
And 4, step 4: and (4) efficiently compounding the hollow tubular polypyrrole composite fiber aerogel obtained in the step (3) with paraffin under the vacuum condition of 80 ℃ to obtain the heat-conducting property-enhanced shaped composite phase-change material.
The stable load rate of the paraffin in the obtained composite phase-change material is 88 percent, the melting enthalpy value is 167J/g, and the heat conductivity increasing rate is 300 percent
Example 2
Step 1: soaking the kapok fiber in a sodium hydroxide solution with the mass concentration of 3wt%, treating at 60 ℃ for 30min to remove lipid on the surface of the fiber, then washing with ethanol and water respectively, and drying to obtain the hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of pyrrole monomer and ammonium persulfate into the solution, fully mixing and reacting for 2 hours at 10 ℃ so that the pyrrole monomer is oxidized and polymerized on the inner and outer tube walls of the kapok fiber, and filtering after the reaction is finished to obtain the polypyrrole coating modified kapok fiber.
And step 3: fully mixing the polypyrrole coating modified kapok fibers obtained in the step with water according to the mass ratio of 1:10 to form a uniform mixed solution, quickly freezing the mixed solution by using liquid nitrogen, and freeze-drying the frozen sample to obtain the hollow tubular polypyrrole composite fiber aerogel with low density and high porosity.
And 4, step 4: and (3) efficiently compounding the hollow tubular polypyrrole composite fiber aerogel obtained in the step (3) with octadecanoic acid under the vacuum condition of 120 ℃ to obtain the heat-conducting property-enhanced shaped composite phase change material.
The stable load rate of octadecanoic acid in the obtained composite phase change material is 85 percent, the melting enthalpy value is 207J/g, and the heat conductivity improvement rate is 290 percent
Example 3
Step 1: soaking the kapok fiber in a sodium hydroxide solution with the mass concentration of 5wt%, treating at 80 ℃ for 60min to remove lipid on the surface of the fiber, then washing with ethanol and water respectively, and drying to obtain the hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of aniline monomer and ferric sulfate into the solution, fully mixing and reacting for 6 hours at 60 ℃ to ensure that the aniline monomer is oxidized and polymerized on the inner and outer pipe walls of the kapok fiber, and filtering after the reaction is finished to obtain the polyaniline coating modified kapok fiber.
And step 3: fully mixing the polyaniline coating modified kapok fiber obtained in the step with water according to the mass ratio of 1:20 to form a uniform mixed solution, quickly freezing the mixed solution by using liquid nitrogen, and freeze-drying the frozen sample to obtain the hollow tubular polyaniline composite fiber aerogel with low density and high porosity.
And 4, step 4: and (3) efficiently compounding the hollow tubular polyaniline composite fiber aerogel obtained in the step (3) with octadecanol under the vacuum condition of 140 ℃ to obtain the shaped composite phase change material with enhanced heat conductivity.
The stable load rate of octadecanol in the obtained composite phase change material is 85%, the melting enthalpy value is 192J/g, and the heat conductivity improvement rate is 320%.
Example 4
Step 1: soaking the kapok fiber in a sodium hydroxide solution with the mass concentration of 8wt%, treating at 100 ℃ for 90min to remove lipid on the surface of the fiber, then washing with ethanol and water respectively, and drying to obtain the hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of aniline monomer and potassium persulfate into the solution, fully mixing and reacting for 8 hours at 80 ℃ so that the aniline monomer is subjected to oxidative polymerization on the inner and outer pipe walls of the kapok fiber, and filtering after the reaction is finished to obtain the polyaniline coating modified kapok fiber material.
And step 3: fully mixing the polyaniline coating modified kapok fiber obtained in the step with water according to the mass ratio of 1:40, after a uniform mixed solution is formed, quickly freezing the mixed solution by using liquid nitrogen, and freeze-drying a frozen sample to obtain the hollow tubular polyaniline composite fiber aerogel with low density and high porosity.
Example 5
Step 1: soaking the kapok fiber in a sodium hydroxide solution with the mass concentration of 10wt%, treating at 120 ℃ for 150min to remove lipid on the surface of the fiber, then washing with ethanol and water respectively, and drying to obtain the hydrophilic kapok fiber.
Step 2: adding a certain amount of hydrophilic kapok fiber into water for uniform dispersion, then adding a certain amount of thiophene monomer and ferric nitrate into the solution, fully mixing and reacting for 20 hours at 10 ℃ so that the thiophene monomer is oxidized and polymerized on the inner and outer tube walls of the kapok fiber, and filtering after the reaction is finished to obtain the polythiophene coating modified kapok fiber material.
And step 3: fully mixing the polythiophene coating modified kapok fiber obtained in the step with water according to the mass ratio of 1:80 to form a uniform mixed solution, quickly freezing the mixed solution by using liquid nitrogen, and freeze-drying the frozen sample to obtain the hollow tubular polythiophene composite fiber aerogel material with low density and high porosity.
And 4, step 4: and (4) efficiently compounding the hollow tubular polythiophene composite fiber aerogel obtained in the step (3) with tetradecane at the temperature of 200 ℃ under a vacuum condition to obtain the heat-conducting property-enhanced shaped composite phase change material.
The stable tetradecane loading rate of the obtained composite phase change material is 80%, the melting enthalpy value is 157J/g, and the heat conductivity improvement rate is 360%.
Claims (4)
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| CN116103774B (en) * | 2023-02-23 | 2024-06-25 | 青岛大学 | Preparation method and application of polylactic acid hollow fiber aerogel |
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