An effective strategy for improving the interface adhesion of the immiscible methyl vinyl silicone elastomer/thermoplastic polyurethane blends via developing a hybrid janus particle with amphiphilic brush
An effective strategy for improving the interface adhesion of the immiscible methyl vinyl silicone elastomer/thermoplastic polyurethane blends via developing a hybrid janus particle with amphiphilic brush
复制标题
通过开发具有两亲刷的混合 janus 颗粒来提高不混溶的甲基乙烯基有机硅弹性体/热塑性聚氨酯共混物的界面粘附力的有效策略
DOI：
10.1016/j.polymer.2020.123375
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发表时间：
2021-01-06
期刊：
影响因子：
4.6
通讯作者：
Tian, Ming
中科院分区：
文献类型：
--
作者：
Hu, Jing;Song, Yanyan;Tian, Ming
甲基乙烯基硅橡胶(MVQ)/热塑性聚氨酯(TPU)共混是开发高强度、高化学稳定性生物医用弹性体的有效途径。然而，MVQ和TPU两相互不相容，界面粘附性很弱。本研究将聚二甲基硅氧烷(PDMS)和聚氨酯(PU)分子链分别接枝到SiO_2@PDVB粒子的两侧，合成了两亲性杂化粒子(PU-SiO_2@PDVB-PDMS)，形成了带有两亲性刷子的Janus粒子相容剂，通过界面上类似分子链的缠结作用，改善了界面的粘附性。与传统的polydimethylsiloxane-polybutadiene-polyurethanes(PU-PB-PDMS)三嵌段共聚体增容剂相比，该粒子增容的共混物在180℃下仍保持较好的稳定性，在溶液共混法中仅加入1wt%的质量分数时，分散相平均尺寸(Dn)急剧减小约3.5倍。在我们看来，这种两亲性的杂化Janus粒子将为实现MVQ与其他不相容聚合物的共混铺平了新的可能性。
Methyl vinyl silicone rubber (MVQ)/thermoplastic polyurethane (TPU) blending is an efficient way to develop biomedical elastomer with high strength and chemical stability. However, the MVQ and TPU phases are immiscible with each other and the interfacial adhesion is very weak. In this research, the amphiphilic hybrid particles (PU-SiO2@PDVB-PDMS) are synthesized by grafting polydimethylsiloxane (PDMS) and polyurethane (PU) molecular chains respectively onto two sides of SiO2@PDVB particles, which formed Janus particle compatibilizer with amphiphilic brush which can improve the interfacial adhesion via the similar molecular chain entanglement at the interface. Compared with traditional polydimethylsiloxane-polybutadiene-polyurethanes (PU-PB-PDMS) triblock copolymer compatibilizer, the MVQ/TPU blending compatibilized with this Janus particle is very stable even after annealing at 180 degrees C, with the average size of dispersed phase (Dn) decreasing sharply about 3.5 times under the addition of only 1 wt% content addition through solution mixing. In our opinion, this amphiphilic hybrid Janus particle will pave a new possibility to realize blending MVQ with other immiscible polymers.