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Thermosetting epoxy resin/thermoplastic system with combined shape memory and self-healing properties

机译：热固性环氧树脂/热塑性体系，兼具形状记忆和自愈性能

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摘要

A novel and facile strategy was proposed to construct a thermosetting/thermoplastic system with both shape memory and self-healing properties based on commercial epoxy resin and poly(epsilon-caprolactone)-PCL. Thermoplastic material is capable of re-structuring and changing the stiffness/modulus when the temperature is above melting temperature. PCL microfiber was used as a plasticizer in epoxy resin-based blends, and served as a 'hard segment' to fix a temporary shape of the composites during shape memory cycles. In this study, the electrospun PCL membrane with a porous network structure enabled a homogenous PCL fibrous distribution and optimized interaction between fiber and epoxy resin. The self-healing capability is achieved by phase transition during curing of the composites. The mechanism of the shape memory effect of the thermosetting (rubber)/thermoplastic composite is attributed to the structural design of the thermoplastic network inside the thermosetting resin/rubber matrix.
机译：提出了一种新颖，简便的策略，以商业环氧树脂和聚（ε-己内酯）-PCL为基础，构建具有形状记忆和自愈特性的热固性/热塑性体系。当温度高于熔化温度时，热塑性材料能够重构并改变刚度/模量。 PCL超细纤维在基于环氧树脂的共混物中用作增塑剂，并充当“硬段”以在形状记忆周期内固定复合材料的临时形状。在这项研究中，具有多孔网络结构的电纺PCL膜实现了PCL纤维的均匀分布，并优化了纤维与环氧树脂之间的相互作用。通过在复合材料固化过程中的相变来实现自我修复能力。热固性（橡胶）/热塑性复合材料的形状记忆效应的机理归因于热固性树脂/橡胶基体内部的热塑性网络的结构设计。

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