Transcrystalline Regions in the Vicinity of Nanofillers in Polyamide-6

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• 作者：Aravind Dasari ; Zhong-Zhen Yu ; Yiu-Wing Mai
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：January 9, 2007
• 年：2007
• 卷：40
• 期：1
• 页码：123 - 130
• 全文大小：1159K
• 年卷期：v.40,no.1(January 9, 2007)
• ISSN：1520-5835

文摘

The presence of preferential organization of lamellar regions in the vicinity of soft (maleic anhydridegrafted polyethylene-octene copolymer, POE-g-MA) and rigid (clay) nanofillers and how these interfaces orligament regions between the nanoadditives and a polymer, polyamide-6, contribute toward the toughening processeswere studied. The preferential lamellar orientation was observed only in the core region of the injection-moldedpolymer nanocomposites, while in other regions flow-induced crystallization was the controlling factor. In thecase of soft fillers, it was shown that the orientation of transcrystalline lamellae along the tensile direction topromote shear yielding is a complex process, but it is not a predominant factor controlling the total toughness ofthe polymer blend, which is the sum of all the deformation processes occurring in all the regions (i.e., surface,intermediate, and core) of the injection-molded samples. For rigid clay systems, delamination of the clay layersoccurred and resulted in only a slight increase of the toughness. Hence, it was suggested that without extensivematrix shear yielding activated by full debonding of the clay/matrix interfaces large improvements in toughnesscannot be realized.