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首页> 外文期刊>Journal of Applied Polymer Science >Lignin Valorization by Forming Toughened Thermally Stimulated Shape Memory Copolymeric Elastomers: Evaluation of Different Fractionated Industrial Lignins
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Lignin Valorization by Forming Toughened Thermally Stimulated Shape Memory Copolymeric Elastomers: Evaluation of Different Fractionated Industrial Lignins

机译：通过形成增韧的热刺激形状记忆共聚物弹性体来实现木质素的平衡：不同工业木质素的评估

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摘要

Lignin-based thermal responsive dual shape memory copolymeric elastomers were prepared with a highly branched prepolymer (HBP, A(2)B(3) type) via a simple one-pot bulk polycondensation reaction. The effect of fractionated lignin type (with good miscibility in the HBP) on copolymer properties was investigated. The thermal and mechanical properties of the copolymers were characterized by DMA, DSC, and TGA. Tensile properties were dominated by HBP <45% lignin content while lignin dominated >45% content. The copolymers glass transition temperature (T-g) increased with lignin content and lignin type did not play a significant role. Thermally stimulated dual shape memory effects (SME) of the copolymers were quantified by cyclic thermomechanical tests. All copolymers had shape fixity rate >95% and >90% shape recovery for all compositions. The copolymer shape memory transition temperature (T-trans) increased with lignin content and T-trans was 20 degrees C higher than T-g. Lignin, a renewable resource, can be used as a netpoint segment in polymer systems with SME behavior. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41389.
机译：通过简单的一锅式本体缩聚反应，用高度支化的预聚物（HBP，A（2）B（3）型）制备基于木质素的热响应双形状记忆共聚物弹性体。研究了分馏木质素类型（在HBP中具有良好的可混溶性）对共聚物性能的影响。共聚物的热和机械性能通过DMA，DSC和TGA表征。拉伸性能主要由HBP <45％木质素含量决定，而木质素占> 45％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，木质素类型没有明显的作用。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。对于所有组合物，所有共聚物的形状固定率均＞ 95％和＞ 90％。共聚物的形状记忆转变温度（T-trans）随木质素含量的增加而提高，T-trans比T-g高20摄氏度。木质素是一种可再生资源，可用作具有SME行为的聚合物系统的网段。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41389。

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