CN115322370A - Preparation method of antifreeze high-conductivity cellulose-based ionic elastomer - Google Patents

Preparation method of antifreeze high-conductivity cellulose-based ionic elastomer Download PDF

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CN115322370A
CN115322370A CN202211044948.8A CN202211044948A CN115322370A CN 115322370 A CN115322370 A CN 115322370A CN 202211044948 A CN202211044948 A CN 202211044948A CN 115322370 A CN115322370 A CN 115322370A
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cellulose
monomer
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储富祥
王欣语
卢传巍
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Nanjing Forestry University
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    • C08G73/00Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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Abstract

The invention discloses a preparation method of an antifreeze high-conductivity cellulose base ionic elastomer, which comprises the following steps: choline chloride, a monomer A and cellulose react for 0.5 to 5 hours at a temperature of between 70 and 130 ℃ according to a certain proportion to prepare the reactive eutectic solvent. The second step is that: adding a certain mass of photoinitiator, oxidant and cross-linking agent into the reactive eutectic solvent, reacting at 70-130 ℃ for 5-30 min, adding a certain amount of monomer B, reacting at 25-50 ℃ for 0.15-4 min, and finally pouring the reaction solution into a mould for ultraviolet curing for 5-60 min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer. The antifreeze high-conductivity cellulose-based ionic elastomer with excellent performance can be simply and efficiently prepared by the method, and the obtained elastomer has great application value in the field of flexible self-powered wearable strain sensors.

Description

Preparation method of antifreeze high-conductivity cellulose-based ionic elastomer
Technical Field
The invention relates to an antifreeze high-conductivity cellulose base ionic elastomer and a preparation method thereof.
Technical Field
As the world population expands, the global demand for energy, chemicals and polymeric materials continues to increase. However, most of chemicals and polymer materials are derived from fossil resources, and the use of a large amount of fossil resources for the production of chemicals, polymer materials, etc. causes energy shortage and environmental problems. Therefore, the research focused on the sustainable polymer materials of renewable biomass can reduce the dependence on fossil resources and relieve the environmental problems, wherein cellulose is the biomass resource with the maximum yield in the world, has the advantages of wide source, low price, renewability and the like, and is the most potential renewable resource in petroleum substitute materials.
In recent years, conductive polymer materials have attracted the interest of researchers and are applied to various fields due to their advantages of high conductivity, structural controllability, good electrical and optical properties, and the like, and have gradually developed toward industrial applications. Common conductive polymer materials are Polyaniline (PANI), polythiophene (PTh), polypyrrole (PPy) and their derivatives. A certain amount of monomer (aniline, thiophene or pyrrole), oxidant and other composite substances are added into a reaction solvent through a chemical oxidation synthesis method, and the monomer is subjected to polymerization reaction under the action of the oxidant and a doping agent, so that the polymer conductive composite material is formed with the composite substances. In addition, the prepared polymer conductive composite material can not only retain the function of a single component and the synergistic effect of other functional materials during integration, but also endow the material with new performance, and greatly improve the conductivity and the application range of the composite material.
Cellulose has good mechanical properties, flexibility, hydrophilicity and chemical and temperature stability, and has been widely used in various fields, and cellulose materials can be effectively connected with conductive polymer materials based on the characteristics of porosity and rich hydroxyl groups of the cellulose materials. The prepared polymer conductive composite material has the advantages of thermal stability, mechanical strength, flexibility and bendability of a fiber material besides environmental stability and high conductivity based on a conductive polymer material, and has a high application value in flexible wearable equipment, and meanwhile, the equipment has the advantages of low energy consumption, quick response, high sensitivity and the like. Therefore, by preparing the antifreeze high-conductivity cellulose base ionic elastomer, the environmental pollution caused by the traditional petroleum base preparation of conductive polymer materials can be relieved, and the method has important significance for further expanding the application range of cellulose, improving the utilization value of the cellulose and promoting the further development of flexible electronic devices.
Disclosure of Invention
The purpose of the invention is as follows: one of the purposes of the invention is to provide a freeze-resistant and high-conductivity cellulose-based ionic elastomer which has excellent freeze resistance and conductivity, can be applied to a flexible self-powered wearable sensor for monitoring human motion, and has the potential of working in a severe environment, so that the added value of cellulose is further improved, and the application range of the cellulose is expanded; the second purpose of the invention is to provide a preparation method of the antifreeze high-conductivity cellulose base ionic elastomer, which has the characteristics of greenness, convenience, high efficiency and low cost.
The technical scheme is as follows: the antifreeze high-conductivity cellulose base ionic elastomer has the structural general formula as follows:
Figure BSA0000282693330000021
wherein R is a functional group characteristic of cellulose and is H, -CH 2 CH 3 、-COCH 3 、-CH 2 CH 2 OH、-CH 2 CH 2 CH 2 Any one of OH.
The invention also provides a preparation method of the antifreeze high-conductivity cellulose base ionic elastomer, which comprises the following steps:
(1) Choline chloride, a monomer A and cellulose react for 0.5 to 5 hours at the temperature of between 70 and 130 ℃ according to a certain proportion to prepare a reactive eutectic solvent;
(2) Adding a certain mass of photoinitiator, oxidant and cross-linking agent into a reactive eutectic solvent, reacting at 70-130 ℃ for 5-30 min, adding a certain mass of monomer B, reacting at 25-50 ℃ for 0.15-4 min, pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 5-60 min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
In the step (1), the molar ratio of choline chloride to monomer A is 1: 1-5, and the mass ratio of monomer A to cellulose is 1: 0.01-0.05.
Wherein the monomer A is any one of acrylic acid, acrylamide, methacrylic acid, hydroxymethyl acrylamide, hydroxyethyl acrylate and hydroxyethyl methacrylate; the cellulose is any one of carboxymethyl cellulose, CM-cellulose, nanocellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose nanocrystal and carboxylated cellulose nanofiber.
The mass of the photoinitiator in the step (2) is 1 to 5 weight percent of that of the monomer A; the mass of the oxidant is 1 to 5 weight percent of the mass of the monomer B; the mass of the cross-linking agent is 0.5 to 3 weight percent of that of the monomer A; the mass of the monomer B is 50-300 wt% of the mass of the cellulose.
Wherein the photoinitiator is any one of benzoin dimethyl ether, 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone and 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide; the oxidant is any one of ferric trichloride, ammonium persulfate and hydrogen peroxide; the cross-linking agent is any one of polyethylene glycol diacrylate, polypropylene glycol diacrylate and N, N' -methylene-bisacrylamide; the monomer B is any one of pyrrole, aniline and thiophene.
Has the beneficial effects that:
(1) The preparation method of the antifreeze high-conductivity cellulose-based ionic elastomer has the characteristics of simplicity, convenience and low cost, the conductivity of the ionic conductive elastomer can be obviously improved by introducing the conductive polymer, the performance of the ionic elastomer can be effectively regulated and controlled by changing the content of cellulose, and the conductivity can be effectively regulated and controlled by changing the proportion of the conductive polymer to the oxidant.
(2) The antifreeze high-conductivity cellulose-based ionic elastomer serving as a novel green conductive polymer has important application value in the field of flexible self-powered wearable strain sensors, has the potential of working in severe environments, and has important significance in further expanding the application range of cellulose, improving the utilization value of the cellulose and promoting the further development of flexible electronic devices.
Drawings
FIG. 1 is a graph of the conductivity of the freeze resistant, highly conductive cellulose-based ionic elastomer of example 1.
FIG. 2 is a graph showing the freezing resistance of the freezing-resistant, highly conductive cellulose-based ionic elastomer of example 1.
FIG. 3 is a unidirectional tensile stress-strain curve of the freeze resistant, highly conductive cellulose-based ionic elastomer of example 1.
Detailed Description
The present invention is described in further detail below with reference to examples.
The starting materials and reagents in the following examples are all commercially available.
Example 1: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using hydroxypropyl cellulose
The first step is as follows: adding choline chloride, acrylic acid and hydroxypropyl cellulose into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ acrylic acid ] = 1: 2 and the mass ratio of [ acrylic acid ]/[ hydroxypropyl cellulose ] = 1: 0.01, and reacting at 95 ℃ for 2.5 hours to prepare a reactive eutectic solvent;
the second step is that: adding 2wt% of photoinitiator 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone based on the mass of acrylic acid, 2wt% of oxidant ferric trichloride based on the mass of pyrrole and 2wt% of cross-linking agent polyethylene glycol diacrylate based on the mass of acrylic acid into a reactive eutectic solvent, reacting at 95 ℃ for 10min, adding 1wt% of pyrrole based on the mass of hydroxypropyl cellulose, reacting at 25 ℃ for 0.5min, pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 15min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
FIG. 1 is the conductivity of the freeze resistant, highly conductive cellulose-based ionic elastomer of example 1: the ionic elastomer has good conductivity at 25 ℃ and-20 ℃, which respectively reach 0.231S/cm and 0.187S/cm, and the characteristics of high conductivity and frost resistance of the ionic elastomer are demonstrated.
FIG. 2 is the freeze resistance of the freeze resistant, highly conductive cellulose-based ionic elastomer of example 1: it can be seen from the figure that the ionic elastomer can still perform good bending and stretching at-20 ℃, which indicates that the ionic elastomer has excellent freezing resistance.
FIG. 3 is a uniaxial tensile stress-strain curve of the freeze resistant, highly conductive cellulose-based ionic elastomer of example 1: as can be seen from the figure, the conductive elastomer has good mechanical properties, the mechanical strength is 0.33MPa, and the elongation at break is 612%.
Example 2: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using carboxylated cellulose nano-fiber
The first step is as follows: adding choline chloride, acrylic acid and carboxylated cellulose nanofibers into a round bottom flask according to the molar ratio of [ choline chloride ]/[ acrylic acid ] = 1: 4 and the mass ratio of [ acrylic acid ]/[ carboxylated cellulose nanofibers ] = 1: 0.03, and reacting at 130 ℃ for 1 hour to prepare a reactive eutectic solvent;
the second step: adding 3wt% of photoinitiator benzoin dimethyl ether of acrylic acid, 3wt% of oxidant ferric trichloride of pyrrole and 1wt% of cross-linking agent polyethylene glycol diacrylate of acrylic acid into a reactive eutectic solvent, reacting at 110 ℃ for 10min, adding 100wt% of pyrrole of carboxylated cellulose nanofiber, reacting at 50 ℃ for 1.5min, finally pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 40min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
Example 3: preparation of antifreeze high-conductivity cellulose base ionic elastomer by utilizing nanocellulose
The first step is as follows: adding choline chloride, acrylamide and nanocellulose into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ acrylamide ] = 1: 5 and the mass ratio of [ acrylamide ]/[ nanocellulose ] = 1: 0.01, and reacting at 70 ℃ for 5 hours to prepare a reactive eutectic solvent;
the second step is that: adding a photoinitiator benzoin dimethyl ether accounting for 5wt% of the mass of acrylamide, an oxidant ammonium persulfate accounting for 5wt% of the mass of aniline and a cross-linking agent polypropylene glycol diacrylate accounting for 0.5wt% of the mass of acrylamide into a reactive eutectic solvent, reacting for 5min at 95 ℃, adding aniline accounting for 50wt% of the mass of nano-cellulose, reacting for 4min at 25 ℃, finally pouring the reaction liquid into a polytetrafluoroethylene mold, and curing for 15min under an ultraviolet lamp to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
Example 4: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using carboxymethyl cellulose
The first step is as follows: choline chloride, methacrylic acid and carboxymethyl cellulose are added into a round bottom flask according to the molar ratio of [ choline chloride ]/[ methacrylic acid ] = 1: 2 and the mass ratio of [ methacrylic acid ]/[ carboxymethyl cellulose ] = 1: 0.02, and the mixture is reacted at 120 ℃ for 3 hours to prepare a reactive eutectic solvent;
the second step: adding 1wt% of photoinitiator 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide based on the mass of methacrylic acid, 2wt% of oxidant ammonium persulfate based on the mass of thiophene and 2wt% of cross-linking agent polypropylene glycol diacrylate based on the mass of methacrylic acid into a reaction type eutectic solvent, reacting at 95 ℃ for 15min, adding 200wt% of thiophene based on the mass of carboxymethyl cellulose, reacting at 25 ℃ for 2min, finally pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 5min to obtain the antifreeze and high-conductivity cellulose-based ionic elastomer.
Example 5: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using CM-cellulose
The first step is as follows: adding choline chloride, hydroxyethyl acrylate and CM-cellulose into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ hydroxyethyl acrylate ] = 1: 1 and the mass ratio of [ hydroxyethyl acrylate ]/[ CM-cellulose ] = 1: 0.04, and reacting at 130 ℃ for 0.5h to prepare a reactive eutectic solvent;
the second step: adding a photoinitiator 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone accounting for 3wt% of hydroxyethyl acrylate into a reactive eutectic solvent, reacting oxidant hydrogen peroxide accounting for 3wt% of aniline with a cross-linking agent N, N' -methylenebisacrylamide accounting for 1.5wt% of hydroxyethyl acrylate at 130 ℃ for 5min, adding aniline accounting for 300wt% of CM-cellulose to react at 25 ℃ for 1.5min, pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 60min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
Example 6: preparation of anti-freezing high-conductivity cellulose base ionic elastomer by using cellulose nanocrystals
The first step is as follows: choline chloride, methacrylic acid and cellulose nanocrystals are added into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ methacrylic acid ] = 1: 2 and the mass ratio of [ methacrylic acid ]/[ cellulose nanocrystals ] = 1: 0.02, and the mixture is reacted at 95 ℃ for 3 hours to prepare a reactive eutectic solvent;
the second step: adding 4wt% of photoinitiator benzoin dimethyl ether of methacrylic acid, 2.5wt% of oxidant ferric trichloride of thiophene and 2wt% of cross-linking agent N, N' -methylene-bis-acrylamide of methacrylic acid into a reactive eutectic solvent, reacting for 5min at 130 ℃, adding 250wt% of thiophene of cellulose nanocrystal, reacting for 3min at 25 ℃, finally pouring the reaction liquid into a polytetrafluoroethylene mold, and curing for 60min under an ultraviolet lamp to obtain the antifreeze and high-conductivity cellulose-based ionic elastomer.
Example 7: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using hydroxyethyl cellulose
The first step is as follows: choline chloride, hydroxyethyl methacrylate and hydroxyethyl cellulose are added into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ hydroxyethyl methacrylate ] = 1: 3 and the mass ratio of [ hydroxyethyl methacrylate ]/[ hydroxyethyl cellulose ] = 1: 0.01, and the mixture reacts for 2.5 hours at 85 ℃ to prepare a reactive eutectic solvent;
the second step is that: adding 2wt% of photoinitiator 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone based on the mass of hydroxyethyl methacrylate, 1wt% of oxidant hydrogen peroxide based on the mass of pyrrole and 0.5wt% of cross-linking agent polypropylene glycol diacrylate based on the mass of hydroxyethyl methacrylate into a reactive eutectic solvent, reacting at 70 ℃ for 20min, adding 200wt% of pyrrole based on the mass of hydroxyethyl cellulose, reacting at 25 ℃ for 3.5min, pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 15min to obtain the antifreeze and high-conductivity cellulose-based ionic elastomer.
Example 8: preparation of antifreeze high-conductivity cellulose base ionic elastomer by using hydroxypropyl cellulose
The first step is as follows: choline chloride, hydroxymethyl acrylamide and hydroxypropyl cellulose are added into a round-bottom flask according to the molar ratio of [ choline chloride ]/[ hydroxymethyl acrylamide ] = 1: 2 and the mass ratio of [ hydroxymethyl acrylamide ]/[ hydroxypropyl cellulose ] = 1: 0.03, and the mixture reacts for 3 hours at 100 ℃ to prepare a reactive eutectic solvent;
the second step is that: adding a photoinitiator 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone accounting for 1wt% of the mass of hydroxymethyl acrylamide, an oxidant ferric trichloride accounting for 5wt% of the mass of aniline and a cross-linking agent N, N' -methylene bisacrylamide accounting for 1wt% of the mass of hydroxymethyl acrylamide into a reactive eutectic solvent, reacting at 100 ℃ for 25min, adding aniline accounting for 100wt% of hydroxypropyl cellulose to react at 25 ℃ for 0.15min, pouring the reaction solution into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 20min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer.
Tests show that the anti-freezing and high-conductivity cellulose-based ionic elastomers prepared in the embodiments 1 to 8 have good mechanical properties, conductivity and anti-freezing properties, have important application prospects in the fields of flexible wearable self-powered sensors and the like, and have the potential of working in severe environments.

Claims (2)

1. An antifreeze high-conductivity cellulose base ionic elastomer is characterized by having the following structural general formula:
Figure FSA0000282693320000011
wherein R is a functional group characteristic of cellulose and is H, -CH 2 CH 3 、-COCH 3 、-CH 2 CH 2 OH、-CH 2 CH 2 CH 2 Any one of OH.
2. A preparation method of an anti-freezing and high-conductivity cellulose base ionic elastomer is characterized by comprising the following steps:
(1) The preparation method comprises the steps of reacting choline chloride, a monomer A and cellulose at 70-130 ℃ for 0.5-5 h according to a certain proportion to prepare a reactive eutectic solvent, wherein the molar ratio of choline chloride to monomer A is 1: 1-5, the mass ratio of monomer A to cellulose is 1: 0.01-0.05, the cellulose is any one of carboxymethyl cellulose, CM-cellulose, nano-cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose nanocrystals and carboxylated cellulose nanofibers, and the monomer A is any one of acrylic acid, acrylamide, methacrylic acid, hydroxymethyl acrylamide, hydroxyethyl acrylate and hydroxyethyl methacrylate.
(2) Adding a certain mass of photoinitiator, oxidant and cross-linking agent into a reactive eutectic solvent, reacting at 70-130 ℃ for 5-30 min, adding a certain mass of monomer B, reacting at 25-50 ℃ for 0.15-4 min, finally pouring the reaction liquid into a polytetrafluoroethylene mold, and curing under an ultraviolet lamp for 5-60 min to obtain the antifreeze high-conductivity cellulose-based ionic elastomer, wherein the certain mass of photoinitiator is 1-5 wt% of the mass of monomer A, the certain mass of oxidant is 1-5 wt% of the mass of monomer B, the certain mass of cross-linking agent is 0.5-3 wt% of the mass of monomer A, the certain mass of monomer B is 50-300 wt% of cellulose, the photoinitiator is benzoin dimethyl ether, 2-hydroxy-4 '- (2-hydroxyethoxy) -2-methyl phenylpropanone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone, 2,4, 6-trimethyl benzoyl-2-methyl phenylpropanone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, 2-methyl-1-phenyl-1-acetone, any one of diphenyl-1-ethylene glycol-bis (N-propylene glycol) ammonium persulfate and any one of N-propylene glycol (N' -propylene glycol) ammonium persulfate and bis (N-propylene glycol) ammonium persulfate.
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