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首页> 外文期刊>Polymers for advanced technologies >Effect of comonomer on thermal/mechanical and shape memory property of L-lactide-based shape-memory copolymers
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Effect of comonomer on thermal/mechanical and shape memory property of L-lactide-based shape-memory copolymers

机译：共聚单体对基于L-丙交酯的形状记忆共聚物的热力学和形状记忆性能的影响

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摘要

In this study, three kinds of L-lactide-based copolymers, poly(lactide-co-glycolide) (PLGA), poly(lactide-co-p-dioxanone) (PLDON) and poly(lactide-co-caprolactone) (PLC), were synthesized by the copolymerization of L-lactide (L) with glycolide (G), or p-dioxanone (DON) or e-caprolactone (CL), respectively. The copolymers were easily soluble in common organic solvents. The compositions of the copolymers were determined by 1{sup left}H-NMR. Thermal/mechanical and shape-memory properties of the copolymers with different comonomers were compared. Moreover, the effect of the chain flexibility of the comonomers on thermal/mechanical and shape-memory properties of the copolymers were investigated. The copolymers with appropriate lactyl content showed good shape-memory properties where both the shape fixity rate (R{sub}f)and the shape recovery rate (R{sub}r) could exceed 95%. It was found that the comonomers with different flexible molecular chain have different effects on their thermal/mechanical and shape-memory properties. Among them, PLGA has the highest mechanical strength and recovery rate while PLC copolymer has high recovery rate when the lactyl content exceeded 85% and the lowest transition temperature (T{sub}(trans)).
机译：在这项研究中，三种L-丙交酯基共聚物，聚（丙交酯-共-乙交酯）（PLGA），聚（丙交酯-对-二恶烷酮）（PLDON）和聚（丙交酯-己内酯）（PLC ）分别通过L-丙交酯（L）与乙交酯（G）或对二恶烷酮（DON）或ε-己内酯（CL）的共聚反应合成。该共聚物容易溶于普通的有机溶剂。共聚物的组成通过1 H-NMR测定。比较了具有不同共聚单体的共聚物的热/机械性能和形状记忆性能。此外，研究了共聚单体的链挠性对共聚物的热/机械和形状记忆性能的影响。具有合适的乳酰基含量的共聚物表现出良好的形状记忆性能，其中形状固定率（R {sub} f）和形状回复率（R {sub} r）均可以超过95％。发现具有不同柔性分子链的共聚单体对其热/机械和形状记忆性能具有不同的影响。其中，当乳酸含量超过85％时，PLGA具有最高的机械强度和回收率，而PLC共聚物具有较高的回收率和最低的转变温度（T {sub}（trans））。

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