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

IF 1.3 4区医学 Q4 MATERIALS SCIENCE, BIOMATERIALS

Cellular Polymers 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

Cellular Polymers 工程技术-材料科学：生物材料

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Cellular Polymers is concerned primarily with the science of foamed materials, the technology and state of the art for processing and fabricating, the engineering techniques and principles of the machines used to produce them economically, and their applications in varied and wide ranging uses where they are making an increasingly valuable contribution. Potential problems for the industry are also covered, including fire performance of materials, CFC-replacement technology, recycling and environmental legislation. Reviews of technical and commercial advances in the manufacturing and application technologies are also included. Cellular Polymers covers these and other related topics and also pays particular attention to the ways in which the science and technology of cellular polymers is being developed throughout the world.