Poly(vinyl alcohol) particle-reinforced elastomer composites with water-active shape-memory effects
Poly(vinyl alcohol) particle-reinforced elastomer composites with water-active shape-memory effects
复制标题
DOI：
10.1016/j.eurpolymj.2014.01.031
复制
发表时间：
2014-04-01
影响因子：
6
通讯作者：
Chen, Biqiong
中科院分区：
文献类型：
--
作者：
Wu, Tongfei;O'Kelly, Kevin;Chen, Biqiong
以聚乙烯醇（PVA）为亚微米颗粒，热塑性聚氨酯（TPU）为弹性源和基体，制备了具有优异水活性形状记忆效应（SMEs）的聚合物复合材料。高模量亲水性PVA颗粒（粒径为80-200 nm）的掺入显著提高了弹性体和疏水性TPU的杨氏模量和吸水率，这导致其在遇水时模量发生较大变化。水作为PVA相的增塑剂，降低了其模量。这种模量变化是可逆的，并且依赖于PVA颗粒的含量，可高达16倍。因此，复合材料的形状记忆性能也依赖于PVA颗粒的含量。PVA颗粒含量为15%的PVA颗粒增强TPU复合材料，其形状固形率为97%，形状恢复率为97%。(C) 2014 Elsevier Ltd.版权所有。
Polymer composites with excellent water-active shape-memory effects (SMEs) were successfully prepared using polyvinyl alcohol (PVA) submicron particles as the SME-activating phase and thermoplastic polyurethane (TPU) as the resilient source and matrix. The incorporation of high-modulus, hydrophilic PVA particles (with a size of 80-200 nm) improved the Young's modulus and water uptake of elastomeric and hydrophobic TPU significantly, which leads to large changes of the modulus upon exposure to water. Water acted as a plasticizer of PVA phase, decreasing its modulus. Such modulus changes were reversible and dependent on the content of PVA particles, which can be up to 16 times. As a result, the shape-memory performance of the composite was also dependent on the content of PVA particles. The PVA particle-reinforced TPU composite containing 15 vol.% PVA particles exhibited the best SMEs among the composites investigated, with the shape fixing and shape recovery ratios being 97% and 97%, respectively. (C) 2014 Elsevier Ltd. All rights reserved.