The effect of carbon nanotubes-grafted lactide on the mechanical and thermal properties of poly (lactic acid) biocomposites
The effect of carbon nanotubes-grafted lactide on the mechanical and thermal properties of poly (lactic acid) biocomposites
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DOI：
10.1177/0731684417696155
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发表时间：
2017-03
影响因子：
3.1
通讯作者：
Gai-hong Wu;Shuqiang Liu;Xiongying Wu;Xuemei Ding
中科院分区：
文献类型：
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作者：
Gai-hong Wu;Shuqiang Liu;Xiongying Wu;Xuemei Ding
源自可再生作物的聚乳酸 (PLA) 是石油产品的有前景的替代品。尽管PLA具有积极的特性，但它也存在脆性等缺点，这阻碍了其在特定应用中的扩展。在这项研究中，丙交酯（LA）被用来接枝碳纳米管（CNT）来增强PLA。在催化下，LA通过开环聚合聚合成PLA，同时接枝到CNT上，得到LA改性的碳纳米管（LA/CNTs）。并利用改性CNTs制备PLA复合薄膜(LA/CNTs/PLA)。改性碳纳米管的傅里叶变换红外光谱（FT-IR）分析表明，LA 与纳米管接枝。扫描电子显微镜图像显示，改性碳纳米管相容且均匀分散在 PLA 基体中。碳纳米管优异的分散性和相容性导致良好的界面附着力，直接增强了PLA的机械性能。 CNT的添加还改善了PLA的热性能。本研究旨在改善PLA的机械和热性能，并为灵活制造具有广泛应用的生物基PLA材料提供基础。
Poly(lactic acid) (PLA) derived from renewable crops is a promising substitute for petroleum-based products. Although PLA exhibits positive features, it also possesses drawbacks, such as brittleness, which hinder its extension in specific applications. In this study, lactide (LA) was used to graft carbon nanotubes (CNTs) to reinforce PLA. Under catalysis, LA was polymerized into PLA through ring-opening polymerization and simultaneously was grafted onto CNTs to obtain CNTs modified by LA (LA/CNTs). And the modified CNTs were used to prepare PLA composite films (LA/CNTs/PLA). Analysis of the Fourier transform infrared spectra (FT-IR) of the modified CNTs indicated that LA was grafted with the nanotubes. The scanning electron microscopy images showed that the modified CNTs were compatible and homogeneously dispersed in the PLA matrix. The excellent dispersibility and compatibility of the CNTs led to good interfacial adhesion, which directly enhanced the mechanical properties of PLA. The addition of CNTs also improved the thermal properties of PLA. This research aims to ameliorate the mechanical and thermal properties of PLA and provides basis for flexible fabrication of bio-based PLA materials for a wide range of applications.