- 【SCI通讯】A new X-shaped copolymer role in PLLA shape memory
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- 所属单位：化学工程学院
- 发表刊物：European Polymer Journal
- 项目来源：其他课题
- 关键字：X-shaped copolymer; PLLA; Shape-memory; Toughness
- 摘要：Thermo-responsive shape memory polymers which are a class of important smart materials can recover permanent shape from temporary shape by simple thermal stimulus, but most of the polymers lack of biodegradability and biocompatibility. Poly(L-lactide) (PLLA) is a green degradable thermoplastic, however, only limited studies involve controlling its shape change. In the work, a new x-shaped copolymer with defined architecture has been devised by using tetramethyltetravinylcyclotetrasiloxane (D4 vi) as centronucleus and polytetrahydrofuran-co-poly(ε-caprolactone) (PTMG-co-PCL) as branch to achieve PLLA shape memory. When the weight ratio of DAPP and PLLA is 50/50, the composite exhibits good thermo-responsive shape memory capacity because a balance between Tm of the x-shaped polymer rand Tg of PLLA is kept. The shape fixation ratio is 84% at 15 °C, and the recovery ratio 94% at 55 °C. And the shape memory capability does not change evidently after the reversible spiral transition is repeated for 30 times. At the same time, the composite shows great flexibility. So the obtained composite is promising for medical and bionic devices, self-healing systems, self-assembly structures.
- 第一作者：宋晓峰
- 论文类型：期刊论文
- 卷号：119
- 页面范围：1
- 是否译文：否
- 发表时间：2019-10-01
