Stereocomplex-type polylactide with remarkably enhanced melt-processability and electrical performance via incorporating multifunctional carbon black
Stereocomplex-type polylactide with remarkably enhanced melt-processability and electrical performance via incorporating multifunctional carbon black
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通过掺入多功能炭黑显着增强熔融加工性能和电性能的立体络合物型聚丙交酯
DOI：
10.1016/j.polymer.2019.122136
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发表时间：
2020-02
期刊：
影响因子：
4.6
通讯作者：
Fu Qiang
中科院分区：
文献类型：
--
作者：
Liu Zhenwei;Ling Fangwei;Diao Xingyuan;Fu Meirui;Bai Hongwei;Zhang Qin;Fu Qiang
立体复合型聚乳酸（SC-PLA）作为一种受欢迎的“绿色”工程塑料，具有优异的物理化学性能和耐久性，在各个领域显示出巨大的应用潜力。然而，SC-PLA的应用仍然面临着主要与其较差的熔融加工性（即，弱的熔体记忆效应促进了排他的SC结晶和极低的熔体粘度）和缺乏必要的功能特征（例如，导电性）在某些情况下。在此，我们设计了一个简单和强大的策略，以克服这些障碍，将炭黑（CB）到等摩尔聚（L-丙交酯）/聚（D-丙交酯）（PLLA/PDLA）共混物。有趣的是发现CB颗粒可以在其表面上吸附许多PLLA/PDLA链段，并且这些强烈吸附的PLA链段可以与表面外的PLA链相互作用以形成能够稳定熔体中的PLLA/PDLA链组装体的物理连接，最终在随后的结晶过程中诱导排他性SC形成。同时，CB颗粒可以显著提高共混物的熔体粘度（当在250 °C和50 Hz下测量时，从3.9 Pa s至844.1 Pa s）。由于PLLA/PDLA/CB复合材料的熔融加工性能得到了很大的改善，通过注射成型，PLLA/PDLA/CB复合材料已成功地加工成具有独特的SC微晶和优异的热机械性能的高度结晶的产品。此外，CB颗粒可以赋予复合产品迷人的电导率（19.0 S/m）和电磁干扰屏蔽效能（26.6 dB）。本研究为高性能、多功能PLA工程生物塑料的开发开辟了一条新的途径。
As a popular “green” engineering plastic, stereocomplex-type polylactide (SC-PLA) exhibits great application potential in various fields owing to its outstanding physicochemical performance and durability. However, the applications of SC-PLA still face formidable challenges mostly associated with its inferior melt-processability (i.e., the weak melt memory effect to motivate exclusive SC crystallization and extremely low melt viscosity) and the lack of necessary functional features (e.g., electrical conductivity) in some cases. Herein, we devise a facile and robust strategy to overcome these obstacles by incorporating carbon black (CB) into equimolar poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blend. It is interesting to find that the CB particles can adsorb many PLLA/PDLA chain segments on their surface and such strongly adsorbed PLA segments could interact with PLA chains outside the surface to form physical junctions capable of stabilizing the PLLA/PDLA chain assemblies in the melt, finally inducing the exclusive SC formation during subsequent crystallization. Meanwhile, the CB particles can substantially enhance the melt viscosity of the blend (from 3.9 Pa s to 844.1 Pa s when measuring at 250 °C and 50 Hz). Because of the greatly improved melt-processability, the PLLA/PDLA/CB composites have been successfully processed into highly crystalline products with exclusive SC crystallites and excellent thermomechanical performance by injection molding. Additionally, the CB particles can endow the composite products with fascinating electrical conductivity (19.0 S/m) and electromagnetic interference shielding effectiveness (26.6 dB). This work could open up a promising avenue towards high-performance and multifunctional PLA engineering Bioplastic.
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影响因子：
15.1
作者：
Cui, Cheng-Hua;Yan, Ding-Xiang;Li, Zhong-Ming
通讯作者：
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影响因子：
4.6
作者：
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通讯作者：
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影响因子：
5.9
作者：
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通讯作者：
Yong Wang
碳纳米管接枝聚（L-丙交酯）-嵌段聚（D-丙交酯）在聚（L-乳酸）/聚（D-乳酸）共混物结晶中的作用：抑制同晶化和增强立构复合物结晶
影响因子：
6
作者：
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通讯作者：
Yang Ming-Bo
影响因子：
9.5
作者：
Jia, Li-Chuan;Zhang, Guoqiang;Li, Zhong-Ming
通讯作者：
Li, Zhong-Ming