Thermal stability of poly(l-lactide)/poly(butylene succinate)/clay nanocomposites

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• 作者：Chen ; Guang-Xin ; Yoon ; Jin-San
• 关键词：Organophilic clay ; X-ray diffractometry ; Tranmission electron microscopy ; Exfoliated silicate layers
• 刊名：Polymer Degradation and Stability
• 出版年：2005
• 出版时间：May, 2005
• 年：2005
• 卷：88
• 期：2
• 页码：206-212
• 全文大小：490 K

文摘

Composites of poly(l-lactide) (PLLA)/poly(butylene succinate) (PBS) with an organophilic clay having a special functional group, namely twice-functionalised organoclay (TFC) were prepared. TFC was produced by treating the commercially available organoclay (Cloisite25A) (C25A) with (glycidoxypropyl)trimethoxy silane (GPS). The morphological structure of nanocomposites was analysed by using X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The silicate layers of PLLA/PBS/TFC were exfoliated to a larger extent than PLLA/PBS/C25A. Not only tensile modulus and tensile strength but also elongation at break of PLLA/PBS was greatly enhanced as a result of melt compounding with TFC. The larger amount of exfoliation of the silicate layers in PLLA/PBS/TFC as compared with that in PLLA/PBS/C25A was attributed to the increased interfacial interaction between the polyesters and the clay through chemical reaction. Thermo gravimetric analysis revealed that both T_{5 %} , which was the temperature corresponding to 5 % weight loss, and activation energy of thermal decomposition of PLLA/PBS/TFC were far superior to those of PLLA/PBS/C25A as well as to those of PLLA/PBS, indicating that the composites with exfoliated silicate layers were more thermally stable than those with intercalated silicate layers.