Characterization of stereocomplex polylactide/nanoclay nanocomposites

Yottha Srithep*, D. Pholharn, L. S. Turng

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

5 引文 斯高帕斯(Scopus)

摘要

Poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA)/nanoclay nanocomposites with nanoclay contents ranging from 1 % to 8 % w/w were prepared by melt blending using an internal mixer. Wide-angle X-ray diffraction (XRD) and differential scanning calorimetry (DSC) results confirmed that complete stereocomplex polylactide (PLA) crystallites without any homocrystallites were produced when equal amounts of PLLA and PLDA were mixed. The nanoclay in the stereocomplex polylactide nanocomposites acted as a nucleating agent that significantly enhanced stereocomplex crystallization, resulting in smaller and finer spherulites. Compared to neat PLLA, the melting temperature of the stereocomplex polylactide and its nanocomposites was about 558C higher. The crystallization temperature of the stereocomplex nanocomposites was also 168C and 55 8C higher than that of the stereocomplex PLA and neat PLLA, respectively. These significant increases in transition temperatures improved the thermal stability of the stereocomplex nanocomposites compared to regular polylactide, which was confirmed by thermogravimetric analysis (TGA). The TGA results also showed that increasing nanoclay content increased the thermal stability of the stereocomplex nanocomposites. Finally, XRD and transmission electron microscopy showed an intercalation nanoclay basal spacing of 3.22 nm in the stereocomplex nanocomposites; a slight increase from the 1.86 nm basal spacing in the as-received nanoclay.

原文英語
頁(從 - 到)121-128
頁數8
期刊International Polymer Processing
32
發行號1
DOIs
出版狀態已出版 - 03 2017
對外發佈

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© Carl Hanser Verlag GmbH & Co. KG.

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