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首页> 外文期刊>Journal of Polymers and the Environment >Design and Characterization of Novel Potentially Biodegradable Triple-Shape Memory Polymers Based on Immiscible Poly(L-lactide)/ Poly(ε-caprolactone) Blends
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Design and Characterization of Novel Potentially Biodegradable Triple-Shape Memory Polymers Based on Immiscible Poly(L-lactide)/ Poly(ε-caprolactone) Blends

机译：基于不溶混聚（L-丙交酯）/聚（ε-己内酯）共混物的新型潜在生物可降解三元形状记忆聚合物的设计与表征

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摘要

In this study, covalently cross-linked network strategy has been applied to prepare new triple-shape memory polymers (TSPs) based on poly(l-lactide) (PLA)/poly(-caprolactone) (PCL) blends. The TSPs were fabricated by adding di-cumyl peroxide, with triallyl isocyanurate as a coagent for performing the cross-linking reaction. The differential scanning calorimetry (DSC) analysis demonstrated that all the PLA/PCL blends show two melting points (T-m,T-PCL and T-m,T-PLA), which can be employed as the transition temperature (T-trans) to induce triple-shape memory behavior. The scanning electron microscopy (SEM) analysis indicated that there are two immiscible morphologies: co-continuous structure and matrix-droplet. The influence of temperature on the crystalline phase changes was analyzed by X-ray diffraction at various temperatures. The results revealed that during the heating-cooling cycle, the degree of crystallinity decreased when the temperature increased and at higher temperature, the crystallization peaks of PCL disappeared. Multiple thermal-mechanical tests were performed and the results showed that the composition ratio of the two phases plays an important role in the triple-shape memory behavior. The results confirmed that the excellent shape memory behavior was obtained for the sample containing 50wt% PCL.
机译：在这项研究中，共价交联网络策略已被应用于基于聚（l-丙交酯）（PLA）/聚（己内酯）（PCL）混合物制备新的三重形状记忆聚合物（TSP）。通过添加过氧化二枯基与三烯丙基异氰脲酸酯作为进行交联反应的助剂来制备TSP。差示扫描量热法（DSC）分析表明，所有PLA / PCL共混物均显示两个熔点（Tm，T-PCL和Tm，T-PLA），可用作过渡温度（T-trans）诱导三重形状记忆行为。扫描电子显微镜（SEM）分析表明，存在两种不混溶的形态：共连续结构和基质液滴。在不同温度下，通过X射线衍射分析了温度对结晶相变化的影响。结果表明，在加热-冷却循环中，随着温度的升高，结晶度降低，而在较高的温度下，PCL的结晶峰消失。进行了多次热机械试验，结果表明，两相的组成比在三重形状记忆行为中起重要作用。结果证实，对于包含50wt％PCL的样品，获得了优异的形状记忆性能。

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