文献类型：期刊文献

英文题名：Morphology evolution, crystalline orientation, and thermal expansion of PA6/SEBS blends with nanolayer networks

作者：Wu, Guozhang[1];Xu, Haibo[1];Zhou, Ting[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2010

卷号：51

期号：15

起止页码：3560

外文期刊名：POLYMER

收录：;EI(收录号：20102713053861);WOS:【SCI-EXPANDED(收录号:WOS:000279756000029)】；

基金：This research was supported by grants from the National Natural Science Foundation of China (50873033), Shanghai Pujiang Program (06PJ14028) and Shanghai Leading Academic Discipline Project (B502). The authors also thank Dr. Hironari Sano in Mitsubishi Chemical Corporation, Japan, for the TEM observation (Figs. 3 and 9).

语种：英文

外文关键词：Thermal expansion; Polymer alloy; Crystalline orientation

摘要：A blend of polyamide 6 (PA6) and styrene-ethylene/butylene-styrene (SEBS) with a co-continuous nanolayer network was fabricated by reactive compounding and subsequent injection molding. The nanostructured polymer alloy was found to exhibit an extremely low coefficient of linear thermal expansion (CLTE) in the flow direction, accompanied by a largely suppressed molding shrinkage. To clarify the influence of the microstructure on thermal expansion behavior, a systematic study of morphology evolution, crystalline orientation, and confined crystallization of the PA6/SEBS (60/40) blend was carried out by means of TEM. DMA, DSC and WAXD measurements. It was found that a lower viscosity of SEBS and the capability of in situ compatibility with PA6 enable a morphology evolution from a disordered co-continuous to droplet-continuous and, finally, to a nanolayer network structure. Multi-scale orientations take place during the injection molding process, and the large reduction of CLTE may originate from the high order microstructure in two aspects: (1) the rubber-deformation-induced orientation of PA6 crystalline in which the b-axis with a negative CLTE orients along the flow direction, and (2) the co-continuous orientation of the rubber and plastic nanolayers, of which the thermal expansion favors towards the normal direction. (C) 2010 Elsevier Ltd. All rights reserved.