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首页> 外文期刊>Journal of Applied Polymer Science >Lignin Valorization by Forming Thermally Stimulated Shape Memory Copolymeric Elastomers—Partially Crystalline Hyperbranched Polymer as Crosslinks
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Lignin Valorization by Forming Thermally Stimulated Shape Memory Copolymeric Elastomers—Partially Crystalline Hyperbranched Polymer as Crosslinks

机译：通过形成热刺激的形状记忆共聚物弹性体（部分结晶的超支化聚合物作为交联剂）形成木质素平衡

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摘要

Lignin based thermal-responsive elastomers were produced by a melt polycondensation reaction with a long alkyl chain hyperbranched poly(ester-amine-amide) (B_3-A_2-CB_3~1). The effect of lignin content on elastomers properties was investigated. The thermal and mechanical properties of the copolymers were characterized by DMA, DSC, and TGA. The morphology of the copolymer was examined by SEM. Tensile properties were dominated by HBP <25% lignin content while lignin dominated >25% content. The copolymers glass transition temperature (T_g) increased with lignin content. The elastomer with 30% lignin content demonstrated optimal mechanical properties (tensile strength 5.3 MPa, Young’s modulus 8.9 MPa, strain at break 301%, and toughness 1.03 GPa). Thermally stimulated dual shape memory effects (SME) of the copolymers were quantified by cyclic thermomechanical tests. The transition temperature (T_(trans)) of the polymer was able to be controlled (room to body temperature) by varying the amount of lignin added which broadens the range to medical applications.
机译：通过与长烷基链超支化聚（酯-胺-酰胺）（B_3-A_2-CB_3〜1）的熔融缩聚反应生产木质素基热响应性弹性体。研究了木质素含量对弹性体性能的影响。共聚物的热和机械性能通过DMA，DSC和TGA表征。通过SEM检查共聚物的形态。拉伸性能主要由HBP <25％木质素含量决定，而木质素占25％含量。共聚物的玻璃化转变温度（T_g）随木质素含量的增加而增加。木质素含量为30％的弹性体表现出最佳的机械性能（抗张强度5.3 MPa，杨氏模量8.9 MPa，断裂应变301％，韧性1.03 GPa）。通过循环热机械试验对共聚物的热激发的双重形状记忆效应（SME）进行定量。通过改变所添加的木质素的量，可以控制聚合物的转变温度（T_（反式））（室温至体温），从而扩大了医学应用的范围。

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