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Elastomer with flexible region constructed by hydrogen bonds and preparation method thereof

An elastomer and flexible technology, applied in the field of flexible polymer elastomer preparation, can solve the problems of weak strength, poor elastic properties, poor mechanical properties, etc.

Active Publication Date: 2020-06-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides an elastomer with a flexible region constructed by hydrogen bonds and a preparation method thereof, aiming to solve the problems of weak strength, poor mechanical properties and poor elastic properties of polymer hydrogen bond composite flexible elastomers in the prior art

Method used

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  • Elastomer with flexible region constructed by hydrogen bonds and preparation method thereof
  • Elastomer with flexible region constructed by hydrogen bonds and preparation method thereof
  • Elastomer with flexible region constructed by hydrogen bonds and preparation method thereof

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preparation example Construction

[0189] The preparation method of the elastic body with the flexible region constructed by hydrogen bonds, the polymer P and the polymer Q are respectively dissolved and mixed at a temperature of 40 to 50 ° C, and after mixing evenly, they are poured into a polytetrafluoroethylene mold, or coated on polytetrafluoroethylene. On the vinyl fluoride plate, the solvent is removed to obtain an elastomer with a flexible region constructed by hydrogen bonds;

[0190] The solvent used for dissolving is N,N dimethylformamide (DMF), N,N dimethylacetamide (DMAC), dimethyl sulfoxide (DMSO) or nitrogen methylpyrrolidone (NMP);

[0191] The dissolved concentration is between 5% and 20% by weight;

[0192] The solvent removal refers to volatilizing most of the solvents in an environment of 40-50° C., and finally drying thoroughly.

[0193] When A in the polymer P is PEO, the preparation steps of the polymer P are as follows:

[0194] (1) Prepare macromolecular chain transfer reagent RAFT-PEO...

Embodiment 1

[0224] Method for constructing elastomers from triblock polymer polystyrene-polyacrylic acid-polystyrene (PS-PAA-PS) and homopolymer polyethylene oxide PEO:

[0225] The molecular weight of PAA is Mn=78000, the molecular weight of PEO is Mn=40000, and the mass fraction of PS accounts for 15wt% of PS-PEO-PS / PAA;

[0226] Dissolve PS-PEO-PS and PAA respectively in the solvent DMF (the dissolved concentration is 5wt%) and mix them at a temperature of 40°C. After mixing evenly, pour them into a polytetrafluoroethylene mold, and volatilize all Solvent, an elastomer with flexible regions constructed by hydrogen bonds is obtained.

[0227] The strength of the elastic body constructed by the hydrogen bond to construct the flexible region is 6MPa under the environment of 40% humidity, the elongation at break is 600%, and the elastic recovery rate is 91%. It has humidity responsiveness (as the humidity increases, the softer) and pH responsiveness.

Embodiment 2

[0229] Method for constructing elastomers from triblock polymer polystyrene-polyethylene oxide-polystyrene (PS-PEO-PS) and homopolymer polyacrylic acid PAA:

[0230] The molecular weight of PEO is Mn=70000, the molecular weight of PAA is Mn=84000, and the mass fraction of PS accounts for 20wt% of PS-PAA-PS / PEO;

[0231] Dissolve PS-PAA-PS and PEO respectively in the solvent DMF (the dissolved concentration is 10wt%) and mix them at a temperature of 45°C. After mixing evenly, inject them into a polytetrafluoroethylene mold, and volatilize at 50°C Solvent, and finally completely dried to obtain an elastomer with a flexible region constructed by hydrogen bonds.

[0232] The strength of the elastic body constructed by the hydrogen bond to construct the flexible region is 6MPa under the environment of 60% humidity, the elongation at break is 600%, and the elastic recovery rate is 93%. It has humidity responsiveness (as the humidity increases, the softer) and pH responsiveness.

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Abstract

The invention relates to an elastomer with a flexible region constructed by hydrogen bonds and a preparation method thereof. A hydrogen bond compound formed between a hydrogen bond donor polymer (D) and a hydrogen bond acceptor polymer (A) is used as a flexible region; rigid molecules with higher glass-transition temperature are introduced into two ends of molecular chains D and A through covalentbonds to serve as hard regions; a hard-b-soft-b-hard block molecular structure is formed; micro-phase separation is formed by utilizing the molecular polarity difference between the hard region and the flexible region; according to the present invention, the hydrogen bond composite elastomer has characteristics of high tensile strength, high elastic property and special functionality (such as humidity responsiveness, pH responsiveness and the like); besides, the constructed elastomer with the physical cross-linking structure has advantages of recycling and cyclic utilization.

Description

technical field [0001] The invention belongs to the technical field of preparation of flexible polymer elastomers, and relates to an elastomer with a flexible region constructed by hydrogen bonds and a preparation method thereof. Background technique [0002] Flexible intelligent materials are increasingly valued by the healthy development of human life. With the advent of the 5G era, as a catalyst for artificial intelligence, it has opened the door to the fourth industrial revolution of mankind, especially for the material requirements of intelligent flexible robots. Elastomer materials can no longer meet the requirements of advanced intelligent technology development. Therefore, the development of smart elastomers with high mechanical properties and multifunctionality with multiple components has become a research hotspot in today's society. In the cutting-edge research report of the Chinese Academy of Sciences at the end of 2018, it was proposed that flexible elastomeric...

Claims

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Application Information

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IPC IPC(8): C08L53/00C08L71/02C08L33/02C08L39/06C08L29/04C08L83/12C08L83/10C08J3/24C08F293/00C08F2/38
CPCC08F2/38C08F293/005C08F2438/03C08J3/246C08J2329/04C08J2333/02C08J2339/06C08J2353/00C08J2371/02C08J2383/10C08J2383/12C08J2429/04C08J2433/02C08J2439/06C08J2453/00C08J2471/02C08J2483/10C08J2483/12
Inventor 杨曙光王伟杰徐弦廖建文
Owner DONGHUA UNIV
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