Shape-Memory Behavior of Polylactide/Silica Ionic Hybrids
Shape-Memory Behavior of Polylactide/Silica Ionic Hybrids
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DOI：
10.1021/acs.macromol.7b00195
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发表时间：
2017-03
期刊：
影响因子：
5.5
通讯作者：
J. Odent;J. Raquez;C. Samuel;S. Barrau;A. Enotiadis;P. Dubois;E. Giannelis
中科院分区：
文献类型：
--
作者：
J. Odent;J. Raquez;C. Samuel;S. Barrau;A. Enotiadis;P. Dubois;E. Giannelis
通过合成基于 PLA 与咪唑鎓封端 PLA 和聚[e-己内酯-co-d,l-丙交酯] (P[CL-co-LA]) 和表面改性二氧化硅纳米颗粒的共混物的离子杂化物，对商业聚丙交酯 (PLA) 进行转化并赋予其形状记忆特性。静电相互作用有助于二氧化硅纳米颗粒在聚合物基质中的分散。由于纳米粒子在聚合物中的分散是一个长期的挑战，并且阻碍了纳米复合材料在性能方面充分发挥潜力，我们预计这种新设计将在其他聚合物系统中得到利用，以合成分散良好的纳米复合材料。离子杂化物的流变测量与网络的形成一致。与纯 PLA 相比，离子杂化物的可变形性也更高。更重要的是，对于含有 25 wt% im-PLA 和 25 wt% im-P[CL-co-LA] 以及 5 wt% SiO2-SO3Na 的混合物，它们表现出形状记忆行为，固定率 Rf ≈ 100%，恢复率 Rr = 79%。介电...
Commercial polylactide (PLA) was converted and endowed with shape-memory properties by synthesizing ionic hybrids based on blends of PLA with imidazolium-terminated PLA and poly[e-caprolactone-co-d,l-lactide] (P[CL-co-LA]) and surface-modified silica nanoparticles. The electrostatic interactions assist with the silica nanoparticle dispersion in the polymer matrix. Since nanoparticle dispersion in polymers is a perennial challenge and has prevented nanocomposites from reaching their full potential in terms of performance we expect this new design will be exploited in other polymers systems to synthesize well-dispersed nanocomposites. Rheological measurements of the ionic hybrids are consistent with the formation of a network. The ionic hybrids are also much more deformable compared to the neat PLA. More importantly, they exhibit shape-memory behavior with fixity ratio Rf ≈ 100% and recovery ratio Rr = 79%, for the blend containing 25 wt % im-PLA and 25 wt % im-P[CL-co-LA] and 5 wt % of SiO2–SO3Na. Dielectr...