A method for preparing (1-vinyl-3-ethylimidazole borate) polyionic liquid/polyvinyl alcohol polymer composite
A technology of ethylimidazolium borate and polyionic liquid, which is applied in the field of preparation of microwave-driven shape memory polymers, can solve problems such as uneven heating, slow heating rate, poor compatibility between inorganic fillers and polymers, and achieve Good shape memory effect, avoid poor compatibility, avoid uneven heating effect
Active Publication Date: 2018-02-16
TAIYUAN UNIV OF TECH
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Problems solved by technology
[0004] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of method for preparing (1-vinyl-3-ethylimidazole borate) polyionic liquid / polyvinyl alcohol polymer composite material, it passes Introducing a microwave absorbing medium into the composite material, so that the polymer material can produce a good shape memory effect under the microwave drive, so as to solve the problem of the compatibility between the inorganic filler and the polymer in the shape memory polymer prepared by adding inorganic filler Poor performance, uneven heating, slow heating rate, unsatisfactory shape memory performance, etc.
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[0031] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0032] 1. 1-vinyl-3-ethylimidazolium borate ionic liquid monomer [ViEtIm][BF 4 ] synthesis and polymerization
[0033] P[ViEtIm][BF 4 ] The synthetic steps are as follows:
[0034]
[0035] The first step: the synthesis of 1-vinyl-3-ethylimidazolium bromide [ViEtIm] [Br]:
[0036] Add 2g of N-vinylimidazole and 4g of bromoethane into a 50mL round-bottomed flask in turn, reflux reaction in an oil bath at 80°C until white turbidity appears, keep the reaction until the white turbidity disappears until the reaction product becomes solid, and then continue the reflux reaction , when the reflux is not obvious, stop heating, wash with ether 2 to 3 times, and dry in vacuo to obtain a white-yellow solid [ViEtIm][Br]; ...
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The invention provides a method for preparing a (1-vinyl-3-ethylimidazole borate)polyion liquid / polyvinyl alcohol polymer composite material. The method comprises the following steps: synthesizing an ethylimidazole functional ion liquid monomer; performing in situ polymerization on the ethylimidazole functional ion liquid monomer in a polyvinyl alcohol solution; introducing the polyion liquid into crosslinked polyvinyl alcohol in order to form a network-like composite material. Large anion-cation groups exist in the polyion liquid structure, have excellent polarization density and polarization rate, and serve as a very good microwave absorbing medium, so that the polymer composite material has a very good shape memory effect under the driving actions of microwaves. Compared with the convention shape memory polymer for realizing optical, electrical and magnetic remote responses by means of adding inorganic fillers under current research, the polymer composite material disclosed by the invention is totally based on a polymer, and is a non-directly-contact microwave-driven shape memory polymer, so that the problems of poor compatibility, non-uniform heating and the like caused by filling of the polymer with the inorganic fillers can be solved.
Description
technical field [0001] The invention relates to the technical field of shape-memory polymers, in particular to a preparation method of microwave-driven shape-memory polymers. Background technique [0002] Shape memory materials are a class of intelligent polymer materials that can respond to external environmental stimuli and have been continuously developed since the 1980s. It is widely used in mechanical systems and medical equipment and other fields due to its advantages such as light weight, easy processing, large deformation, and significant memory effect. In recent years, researchers have been exploring a variety of driving methods that can cause shape memory materials to undergo deformation recovery (see: Shape memory polymers: Past, present and future developments, Martin D. Hager, Stefan Bode, Christine Weber, Ulrich S. Schubert, Progress in Polymer Science 49 (2015) 3-33; New directions in the chemistry of shape memory polymers, Gayla J. Berg, Matthew K. McBride, ...
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IPC IPC(8): C08L29/04C08L39/04C08F126/06
CPCC08F126/06C08L29/04C08L2201/12C08L2312/00C08L39/04
Inventor 杜海燕李启庚梁镇海邹娜王忠德
Owner TAIYUAN UNIV OF TECH