CN106947133A - A kind of water-responsive elastomer functional composite material and preparation method thereof - Google Patents
A kind of water-responsive elastomer functional composite material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The present invention relates to a kind of water-responsive elastomer functional composite material and preparation method thereof, belong to technical field of function materials.The fibrillar silicate of 0.7~3.0 mass parts, the nano micro crystal cellulose filler of 1.0~4.3 mass parts are added in the epoxy natural latex of 100 mass parts by the present invention, a kind of quick water-responsive elastomer functional composite material is prepared by In-situ reaction membrane formation process, the composite has with low cost, the characteristics of preparation technology is simple, with multiple hydrogen bonding network structure, with high water-responsive sensitiveness, invertibity.It can be used as shape memory elastic body, biology sensor and in fields such as medical science (such as self-tightening type suture).
Description
Technical field
The present invention relates to a kind of water-responsive elastic composite and preparation method thereof.Belong to functional material technology neck
Domain.
Background technology
Water-responsive sexual function composite is a kind of can be changed under the stimulation of water by changing the structure of therein
Become the shape of material and the composite of performance.Water is a kind of most common stimulus for organism, is also most safe
With direct stimulus, so compared with other stimuli responsive functional composite materials, water-responsive sexual function composite, in biology
Had a very wide range of applications in terms of medical and biology sensor.
The preparation method of traditional water-responsive sexual function composite mainly adds nanofiber whisker in elastomer
Prepare composite.Great amount of hydroxy group is contained on nanofiber whisker surface, and nanofiber whisker is added in elastomer, can pass through hydrogen
Key, which is acted on, forms hydrogen bond network in elastomer matrix, greatly promote the mechanical property of rubber matrix.Meet hydrogen bond network quilt after water
Destruction, the enhancing effect to rubber matrix weakens significantly.The Hong Kong Polytechnic University utilizes dry/hygrometric state of nano micro crystal cellulose first
Under reversible Percolation network, with reference to the entropic elasticity of macromolecular elastomer, using nano micro crystal cellulose as filler, thermoplastic poly
Urethane as matrix, construct out with water-responsive feature composite material of shape memory system (referring to ZhuY, HuJL,
LuoHS,YoungRJ,DengLB,ZhangS,etal.Rapidly switchable water-sensitive shape-
memory cellulose/elastomer nano-composites.SoftMatter2012,8:2509-2517).But this
Composite is planted, the dispersion effect of nano micro crystal cellulose is substantially reduced with the increase of its consumption, the increasing to elastomer matrix
Potent fruit also weakens significantly, and the hydrogen bond network structure formed in this composite is single, causes water-responsive not excellent enough.
To solve the problems, such as the decentralized of nano micro crystal cellulose, Beijing University of Chemical Technology is prepared scattered using sulphuric acid hydrolysis filter paper
Property good nano micro crystal cellulose, be added into epoxy natural rubber, be prepared for nano micro crystal cellulose/epoxidation day
Right rubber functional elastomer (flies preparation and performance study Beijing of nano-cellulose base functional elastomers referring to [D] Wang Zhi
Work university, 2015.), the enhancing effect of nano micro crystal cellulose in the elastomer is improved, water-responsive is functional.But make
With the hydrogen bond network structure or relatively simple of single filler formation, also fail to make the water-responsive of material to be optimal, and system
Standby process is more complicated, and cost is higher.The A of patent CN 104693545 disclose a kind of water-responsive of whisker containing bacteria cellulose
Sensing rubber film and preparation method thereof.Added with homemade bacteria cellulose as filler in rubber latex and mixed liquor be made,
Mixed liquor is flocculated using flocculant, so that composite material film is prepared into, with certain water-responsive.But flocculating latex
Afterwards, rubber molecular chain is released, and filler is embedded so that gap very little between rubber particles, and contact of the filler with water is more
Plus it is difficult, reduce water-responsive sensitiveness.And bacteria cellulose is to synthesize to make by bacterium, preparation method is more complicated, into
Ben Genggao.
Therefore, for water-responsive sexual function composite, the dispersiveness and water-responsive for improving nano micro crystal cellulose are quick
The problem of perception and invertibity are always primary study.Fibrillar silicate is as a kind of common gum filler, and hydroxyl is contained on surface
Base is less, is typically only used for reinforced rubber, not yet has and is applied to the research for preparing water-responsive composite report.This hair
It is bright and a kind of hypersensitivity is made with nano micro crystal cellulose, two kinds of fillers of fibrillar silicate and epoxy natural latex, it is high reversible
The rapid water response elastomer functional composite material of property.
The content of the invention
It is an object of the invention to provide a kind of quick water-responsive elastomer functional composite material and preparation method thereof.The present invention
Fibrillar silicate, two kinds of fillers of nano micro crystal cellulose are added in epoxy natural latex, using In-situ reaction film forming legal system
Have preferable synergy, two kinds of filler surface hydroxyls and epoxidized natural latex substrate ring oxide group three between a kind of filler
Multiple hydrogen bonding network structure, hypersensitivity, high reversible quick water-responsive elastomer functional composite material are formed between person.
Water-responsive elastomer functional composite material of the present invention, its composition includes:The epoxy of 100 mass parts is natural
The nano micro crystal cellulose filler of latex matrix, the fibrillar silicate of 0.7~3.0 mass parts and 1.0~4.3 mass parts.
Above-mentioned epoxy natural latex solid content is 40%~60%, and epoxy content is 25%~50%
Above-mentioned fibrillar silicate is the one or two in attapulgite, palygorskite.
A diameter of 20~the 60nm of above-mentioned fibrillar silicate, length is 400~1100nm.
Between a diameter of 20~60nm of above-mentioned nano micro crystal cellulose, length is 100~400nm.
The preparation method of above-mentioned water-responsive elastomer functional composite material is as follows:
(1) preparation of nano micro crystal cellulose/fibrillar silicate suspension
The fibrillar silicate of 0.7~3.0 mass parts is added in deionized water, 1~3h is stirred;Add 1.0~4.3 mass
The nano micro crystal cellulose of part, 1~3h of ultrasonic disperse produces nano micro crystal cellulose/fibrillar silicate suspension;
(2) preparation of mixed liquor
The epoxy natural latex of 100 mass parts is stirred into 1~3h at 20~30 DEG C, the obtained suspension of step (1) is added
Liquid, 1~3h is stirred at 10~30 DEG C, and finely dispersed mixed liquor is made;
(3) mixed liquor made from step (2) is poured into mould, 30~60h is dried at 25~80 DEG C, film is made.
Above-mentioned mould is Teflon mould.
Above-mentioned microcrystalline cellulose/fibrillar silicate suspension add first be placed on before latex at 30~50 DEG C except 1~
2h water, to reduce the film formation time of mixed liquor.
Different from traditional water-responsive elastic composite, the present invention not only adds nanofiber whisker fillers, together
When be also added into just can reach the fibrillar silicate of good dispersion effect under mechanical action, the fibrillar silicate of addition and receive
The two forms hydrogen bond action to rice fibrous crystal palpus, not only greatly improves the dispersiveness of nano micro crystal cellulose;And needle-like silicon
Although hydrochlorate surface hydroxyl is less, draw ratio is conducive to building forming hydrogen bond network than larger, and nano micro crystal cellulose is long
Footpath is than smaller, but surface is rich in hydroxyl, and with two kinds of fillers, can be had complementary advantages, and plays good synergy, shape
Into more multiple hydrogen bond network structure, make its enhancing effect more preferably, water-responsive sensitiveness and invertibity are stronger.In addition, this hair
Bright to use the epoxy natural rubber for containing epoxy-functional as matrix, except forming hydrogen bond network between filler, rubber is with filling out
Also hydrogen bond is formed between material so that the interface interaction between filler and matrix is stronger, the network structure of formation is also more multiple, this
Plant the water-responsive that multiple hydrogen bonding network structure further increases composite.Therefore, the present invention by nano micro crystal cellulose,
Two kinds of fillers of fibrillar silicate are added in epoxy natural rubber latex, the water-responsive bullet prepared by In-situ reaction membrane formation process
Property body function composite compared with the water-responsive composite prepared in the past, with low cost, technique is simple, nano microcrystalline fiber
The dispersion effect of element more preferably, and forms multiple hydrogen bonding network structure, and the rigid multiple hydrogen bonding network structure is in the thorn of water
Swash lower destroyed, after material is dried, this characteristic formed again so that the sensitiveness and invertibity of water-responsive are stronger.This hair
Bright obtained water-responsive elastomer functional composite material can be led as shape memory elastic body, biology sensor and medical science etc.
Domain uses (such as self-tightening type suture).
Brief description of the drawings
Fig. 1 is nano micro crystal cellulose, fibrillar silicate, the natural rubber of epoxy in water-responsive elastomer nanocomposites
The formation of multiple hydrogen bonding network and destruction (anhydrous/to have water) schematic diagram between glue three.
Fig. 2 be embodiment 1, comparative example 1, comparative example 2 and comparative example 3 composite membrane respectively before being swelled, be swelled after and
It is swelled the storage modulus figure at 37 DEG C measured under rear drying condition.
Fig. 3 be embodiment 2, embodiment 3 and embodiment 4 composite membrane respectively before being swelled, be swelled after and dry after being swelled
The storage modulus figure at 37 DEG C measured under the conditions of dry.
Embodiment:
With reference to embodiment, the present invention will be further described:
Embodiment 1
(1) 1.81g fibrillar silicates are added in deionized water, rotating speed 600r/min, stirs 1h, stable needle-like is made
Silicalite suspension;Nano micro crystal cellulose 2.65g, ultrasonic disperse 1h are added, nano micro crystal cellulose/fibrillar silicate is made
Suspension.(2) it is 50% by 100g solid contents, epoxy content is placed in 1L beakers for 50 epoxy natural latex, is stirred at 20 DEG C
Mix 1h;1h is dried in addition in 30 DEG C of baking ovens, removes the nano micro crystal cellulose after a large amount of water/fibrillar silicate suspension, room temperature
Under, magnetic agitation 1h produces mixed liquor.(3) mixed liquor of gained is poured into Teflon mould, puts it into baking oven,
60h is dried at 30 DEG C, the thick films of about 0.5mm are made.
The above-mentioned fibrillar silicate that uses be 30~50nm of diameter, length be 500~1000nm, density be 2.2 ×
103kg/m3Attapulgite.
The above-mentioned nanocrystalline cellulose used flies preparation and the property of nano-cellulose base functional elastomers referring to [D] Wang Zhi
It can study Beijing University of Chemical Technology, 2015., specific preparation method is as follows:
With the sulfuric acid 87.5ml of 98% concentrated sulfuric acid configuration quality fraction 64%, at 45 DEG C, 2g cellulosic filter papers are added, with perseverance
Fixed mixing speed sour water solution 1h.Obtained suspension deionized water dilutes 10 times, 5000 revs/min of centrifugation 10min, so that fine
Dimension element is concentrated, and removes unnecessary aqueous acids.Washing obtains sediment, and centrifuges again.This obtained suspension is positioned over
In bag filter, using deionized water as dialyzate, continuous dialysis to the pH value of suspension reaches 6~7, then obtained suspension is entered
One step is by ultrasonically treated scattered, to form the cellulose of nano-scale.Finally, suspension is carried out using freeze drier cold
It is 1.5 × 10 that jelly, which is dried to obtain density,3kg/m3Powdered nanocrystalline cellulose.Using the SEM of Japanese Hitachi S4800 models
Powdered nanocrystalline cellulose is characterized, its size is basically identical, diameter about 30~50nm, length is 200~300nm.
The method of testing of storage modulus:Using particular manufacturing craft by nano micro crystal cellulose/natural rubber of fibrillar silicate/epoxy
Glue laminated film is cut into three groups of long 50mm × wide 6mm sample, and first group of sample is set as into strain 0.1% by test condition,
DMTA tests under frequency 1Hz, -100 DEG C of temperature scanning scope~100 DEG C, 5 DEG C/min of heating rate stretch mode, from obtaining
The curve that the storage modulus obtained is varied with temperature, obtains the storage modulus at 37 DEG C.Second group of sample is entered into trip temperature for 37 DEG C
Under isothermal stretching, constant force is continuously applied after 40min, in the water that sample is immersed in 37 DEG C, record storage modulus anaplasia at any time
The curve of change, the minimum value of storage modulus is swelled the storage modulus value at latter 37 DEG C for sample, and measuring condition is that strain is
0.2%, stress is 0.05N, and frequency is 1Hz, and sweep speed is 1 DEG C/min.By the water of the 3rd group of sample, plus 37 DEG C, 2h is soaked,
24h is dried after being swelled at 45 DEG C, the DMTA tests with first group of sample are carried out again.Test result is shown in accompanying drawing 2.
Comparative example 1
Without using epoxy natural latex, 200g is used instead, solid content is 30% Heveatex, configures receiving for be the same as Example 1
Rice microcrystalline cellulose/fibrillar silicate suspension, puts in baking oven and dries 1h at 30 DEG C, to remove after substantial amounts of water, add it to
In the Heveatex of gained, at room temperature, magnetic agitation 1h.The mixed liquor of gained is poured into Teflon mould, at 30 DEG C
60h is dried in baking oven, the thick films of about 0.5mm are made, method of testing be the same as Example 1, test result is shown in accompanying drawing 2.
The above-mentioned fibrillar silicate used, nanocrystalline cellulose be the same as Example 1.
Comparative example 2
Without using nano micro crystal cellulose, directly 3.64g fibrillar silicates are added 1h is stirred in deionized water, ultrasound point
1h is dissipated, stable fibrillar silicate suspension is prepared;Dried in 30 DEG C of baking ovens after 1h, be added to the epoxy natural gum of gained
Breast, at room temperature, magnetic agitation 1h;The mixed liquor of gained is poured into Teflon mould, 60h is dried in 30 DEG C of baking ovens, is made
Into the thick films of about 0.5mm, method of testing be the same as Example 1, test result is shown in accompanying drawing 2.
The above-mentioned fibrillar silicate be the same as Example 1 used.
Comparative example 3
Fibrillar silicate is not added with, directly 5.29g nano micro crystal celluloses are added in deionized water and stir 1h, ultrasonic disperse
1h, prepares stable nano micro crystal cellulose suspension;Dried in 30 DEG C of baking ovens after 1h, be added to the epoxy natural gum of gained
In breast, at room temperature, magnetic agitation 1h.The mixed liquor of gained is poured into Teflon mould, baking oven is put it into, at 30 DEG C
Lower baking 60h, is made the thick films of about 0.5mm, and method of testing be the same as Example 1, test result is shown in accompanying drawing 2.
The above-mentioned fibrillar silicate used, nanocrystalline cellulose be the same as Example 1.
Embodiment 2
(1) 2.91g attapulgite is added in deionized water, rotating speed 600r/min, stirs 1.5h, prepare stabilization
Fibrillar silicate suspension;Homemade nano micro crystal cellulose 1.06g, ultrasonic disperse 1h are added, obtained nano micro crystal cellulose/
Fibrillar silicate suspension.(2) it is 40% by 100g solid contents, epoxy content is placed in 1L beakers for 25 epoxy natural latex,
3h is stirred at room temperature;1.5h is dried in addition in 40 DEG C of baking ovens, removes nano micro crystal cellulose/fibrillar silicate after a large amount of water and hangs
Supernatant liquid, 20 DEG C of magnetic agitation 1.5h produce mixed liquor.(3) mixed liquor of gained is poured into Teflon mould, put
Enter baking oven, 50h is dried at 40 DEG C, the thick films of about 0.5mm are made, method of testing be the same as Example 1, test result is shown in accompanying drawing 3.
The above-mentioned fibrillar silicate used, nanocrystalline cellulose be the same as Example 1.
Embodiment 3
1.45g fibrillar silicate is added in deionized water, rotating speed 600r/min, stir 2h, prepare stable pin
Shape silicalite suspension;Homemade nano micro crystal cellulose 3.71g, ultrasonic disperse 1h are added, nano micro crystal cellulose/pin is made
Shape silicalite suspension.(2) it is 60% by 100g solid contents, epoxy content is placed in 1L beakers for 40 epoxy natural latex, 27
DEG C stirring 2h;80min is dried in addition in 45 DEG C of baking ovens, removes nano micro crystal cellulose/fibrillar silicate after a large amount of water and suspends
Liquid, at 10 DEG C, magnetic agitation 2h produces mixed liquor.(3) mixed liquor of gained is poured into Teflon mould, put it into
Baking oven, 40h is dried at 60 DEG C, and the thick films of about 0.5mm are made, and method of testing be the same as Example 1, test result is shown in accompanying drawing 3.
The above-mentioned fibrillar silicate used, nanocrystalline cellulose be the same as Example 1.
Embodiment 4
(1) 0.73g fibrillar silicates are added in deionized water, rotating speed 600r/min, stirs 3h, prepare stable pin
Shape silicalite suspension;Homemade nano micro crystal cellulose 4.23g, ultrasonic disperse 1h are added, nano micro crystal cellulose/pin is made
Shape silicalite suspension.(2) it is 45% by 100g solid contents, epoxy content is placed in 1L beakers for 30 epoxy natural latex, 30
DEG C stirring 1.5h;2h is dried in addition in 50 DEG C of baking ovens, removes nano micro crystal cellulose/fibrillar silicate after a large amount of water and suspends
Liquid, at 30 DEG C, magnetic agitation 3h produces mixed liquor.(3) mixed liquor of gained is poured into Teflon mould, put it into
Baking oven, 40h is dried at 60 DEG C, and the thick films of about 0.5mm are made, and method of testing be the same as Example 1, test result is shown in accompanying drawing 3.
The above-mentioned fibrillar silicate used, nano micro crystal cellulose be the same as Example 1.
Compared with Example 1, comparative example 1 uses Heveatex, does not contain and is used only in epoxide group, comparative example 2
Fibrillar silicate is as single filler, and nano micro crystal cellulose is used only as single filler in comparative example 3, the test in accompanying drawing 2
As a result show, filler is all relatively low to the enhancing effect of matrix in comparative example, and storage modulus declines up to 36.4% after water suction,
Storage modulus response rate is up to 79.1%, and water-responsive sensitiveness and invertibity are all poor.And the present invention uses In-situ reaction
Nano micro crystal cellulose/fibrillar silicate/epoxy natural rubber functional composite material prepared by membrane formation process is (see accompanying drawing 2, accompanying drawing
3), storage modulus is minimum after its water suction declines 67.4%, averagely declines 73.8%, water-responsive sensitiveness is good, time of storage modulus
Multiple rate minimum 97.4%, average out to 97.0%, invertibity is excellent.Wherein the water-responsive sensitiveness and invertibity of embodiment 1 is most
Excellent, storage modulus declines 81.0% after it absorbs water, and storage modulus response rate is 98.3%.In summary, the present invention is prepared
Water-responsive sensitiveness and invertibity all very excellent water-responsive elastic composites.
Claims (8)
1. a kind of water-responsive elastomer functional composite material, it is characterised in that its composition includes:The epoxy day of 100 mass parts
The nano micro crystal cellulose filler of right latex matrix, the fibrillar silicate of 0.7~3.0 mass parts and 1.0~4.3 mass parts.
2. water-responsive elastomer functional composite material according to claim 1, it is characterised in that described epoxy is natural
Latex solid content is 40%~60%, and epoxy content is 25%~50%.
3. water-responsive elastomer functional composite material according to claim 1, it is characterised in that described needle-like silicic acid
Salt is the one or two in attapulgite, palygorskite.
4. water-responsive elastomer functional composite material according to claim 1, it is characterised in that described needle-like silicic acid
Salt 20~60nm of diameter, length is 400~1100nm.
5. water-responsive elastomer functional composite material according to claim 1, it is characterised in that described nano microcrystalline
A diameter of 20~the 60nm of cellulose, length is 100~400nm.
6. according to the preparation method of any described water-responsive elastic composite of claim 1 to 5, it is characterised in that
Comprise the following steps:
(1) preparation of nano micro crystal cellulose/fibrillar silicate suspension
The fibrillar silicate of 0.7~3.0 mass parts is added in deionized water, 1~3h is stirred;Add 1.0~4.3 mass parts
Nano micro crystal cellulose, 1~3h of ultrasonic disperse produces nano micro crystal cellulose/fibrillar silicate suspension;
(2) preparation of mixed liquor
The epoxy natural latex of 100 mass parts is stirred into 1~3h at 20~30 DEG C, suspension, 10 made from step (1) is added
1~3h is stirred at~30 DEG C, finely dispersed mixed liquor is made;
(3) mixed liquor made from step (2) is poured into mould, 30~60h is dried at 25~80 DEG C, film is made.
7. the preparation method of water-responsive elastomer functional composite material according to claim 6, it is characterised in that described
Mould be Teflon mould.
8. the preparation method of water-responsive elastomer functional composite material according to claim 6, it is characterised in that described
Nano micro crystal cellulose/fibrillar silicate suspension add the water for being first placed on before latex at 30~50 DEG C and removing 1~2h.
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CN110527036A (en) * | 2019-09-12 | 2019-12-03 | 临沂大学 | High molecular material and preparation method thereof with water-responsive bidirectional reversible shape memory function |
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Cited By (3)
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CN108467517A (en) * | 2018-02-02 | 2018-08-31 | 桂林理工大学 | A kind of preparation method of high intensity water-responsive cellulose base composite material of shape memory |
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