Preparation method of reshapeable shape memory elastomer based on eutectic crystal

An elastomer and memory technology, applied in the field of chemically cross-linked copolyester with low-temperature shape memory effect and its preparation, can solve the problems of reducing material modulus and thermal stability, achieve excellent shape memory performance, accelerate degradation rate, The effect of reducing stress

Active Publication Date: 2020-06-12
QUZHOU RES INST OF ZHEJIANG UNIV
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Problems solved by technology

On the other hand, copolymers with low crystallinity r

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  • Preparation method of reshapeable shape memory elastomer based on eutectic crystal
  • Preparation method of reshapeable shape memory elastomer based on eutectic crystal
  • Preparation method of reshapeable shape memory elastomer based on eutectic crystal

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] (1) Preparation of polyester diol

[0049] The polyester diol is prepared by the ring-opening polymerization method, and the specific steps can refer to the content introduced in the Chinese patent document CN107022070B.

[0050] Table 1: Initiators, monomers, catalysts, reaction temperatures, and reaction times used in the preparation of homopolyesters 1 to 4

[0051]

[0052] Note: Sn(Oct) 2 For stannous octoate.

[0053] (2) Preparation of cocrystallizable copolyesterdiol

[0054] The specific steps for preparing eutectic copolyesterdiol by transesterification are: uniformly mixing two or more cocrystallizable polyesterdiols and a transesterification catalyst in an appropriate amount of solvent, the transesterification catalyst accounting for 0.2-2.0 wt% of the total mass of the diol; after the solvent is removed, the...

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Abstract

The invention relates to a shape memory elastomer technology, and aims to provide a preparation method of a reshapeable shape memory elastomer based on eutectic crystal. The method comprises the following steps: preparing linear aliphatic polylactone glycol by a ring-opening polymerization method, dissolving two or more than two of linear aliphatic polylactone glycol and an ester exchange catalystin a proper amount of solvent, uniformly dispersing the raw materials, and removing the solvent; heating the mixture for reaction; carrying out chemical crosslinking on eutecticable copolyester diolobtained by the reaction and polyfunctional isocyanate to prepare an elastomer; or modifying the eutecticable copolyester diol into a prepolymer modified by terminal double bonds, and then performingchemical crosslinking on the prepolymer with a polyfunctional group sulfhydryl compound to prepare the elastomer. The method achieves simple preparation of copolyesters with different sequence structures and melting points, and is suitable for mass production. The elastomer with different thermal transition temperatures and high crystallinity is obtained, and the application requirement is satisfied. The product has excellent shape memory performance at respective deformation temperatures, the fixation rate and the recovery rate are close to 100%, and the requirements of different occasions can be met.

Description

technical field [0001] The invention relates to the technical field of shape-memory elastomers, and more specifically relates to a chemically cross-linked copolyester based on eutectic and having high-temperature remodeling performance and low-temperature shape-memory effect and a preparation method thereof. Background technique [0002] As a class of smart materials, shape memory polymers can change their shape under external stimuli, such as heat, light, electricity, magnetism, and solvents. Therefore, in recent years, it has developed into a polymer material that has attracted much attention, and is expected to play a huge role in the fields of biomedicine, smart fabrics, packaging, soft robots, and aerospace. Thermal transition temperature is one of the most important parameters of shape memory materials, which determines the applications of such materials. Thermal transition temperature generally refers to the glass transition temperature of an amorphous polymer or the...

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Application Information

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IPC IPC(8): C08G18/42C08F299/04C08F2/48
CPCC08G18/4275C08G18/4277C08G18/4269C08F299/0428C08F299/0492C08F2/48C08G2280/00
Inventor 潘鹏举袁文华单国荣包永忠
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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