Preparation and characterization of PLA foam chain extended through grafting octa(epoxycyclohexyl) POSS onto carbon nanotubes

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-03-19 DOI:10.1177/0262489320912521

Wei Liu, Xunxian Zhu, Hongxiang Gao, Xiangdong Su, Xian Wu

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引用次数: 6

Abstract

Improving foamability of poly (lactic acid) (PLA) resin is a key issue for its critical foaming applications with high-performance and ultralow density. However, owing to the rheological nature of linear PLA chain structure with relatively low molecular weight, the overall foamability of PLA resin cannot meet the processing requirements of foaming purpose. Here, we describe a simple and versatile technique to prepare high foamability PLA resin by inducing chain extender through grafting octa(epoxycyclohexyl) polyhedral oligomeric silsesquioxanes (POSS) on carbon nanotubes (CNT). After the orderly assemble of the two nanoparticles, an obvious increase in melt elasticity of PLA is observed. The enhanced melt elasticity of PLA had a significant effect on controlling subsequent foaming behavior. Thus, a homogeneous and finer cellular morphology of PLA rigid foam was obtained with a proper content of CNT-POSS. Eventually, the expansion ratio of chain-extended PLA foam was 13 times higher than that of unmodified PLA foam. The proposed design methodology will potentially pave a way for designing and preparing high-performance PLA rigid foam products.

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碳纳米管接枝八（环氧环己基）POSS扩链聚乳酸泡沫的制备与表征

提高聚乳酸（PLA）树脂的发泡性是其高性能、超低密度发泡应用的关键问题。然而，由于分子量相对较低的线性PLA链结构的流变性，PLA树脂的整体发泡性不能满足发泡目的的加工要求。在这里，我们描述了一种简单而通用的技术，通过在碳纳米管（CNT）上接枝八（环氧环己基）多面体低聚倍半硅氧烷（POSS）诱导扩链剂来制备高发泡性PLA树脂。两种纳米颗粒有序组装后，PLA的熔体弹性明显增加。PLA熔体弹性的增强对控制后续发泡行为有显著影响。因此，在CNT-POSS含量适当的情况下，获得了均匀且精细的PLA刚性泡沫的细胞形态。最终，扩链PLA泡沫的膨胀率比未改性PLA泡沫高13倍。所提出的设计方法将有可能为设计和制备高性能PLA硬质泡沫产品铺平道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.