Microstructure and mechanical properties of microcellular injection molded polyamide-6 nanocomposites
Microstructure and mechanical properties of microcellular injection molded polyamide-6 nanocomposites
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DOI：
10.1016/j.polymer.2005.06.054
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发表时间：
2005-08
期刊：
影响因子：
4.6
通讯作者：
M. Yuan;L. Turng
中科院分区：
文献类型：
--
作者：
M. Yuan;L. Turng
研究了注射成型聚酰胺6（PA6）纳米复合材料的微观结构和力学性能。细胞壁结构和光滑度由晶体结构的大小决定，而晶体结构的大小又取决于材料体系和成型条件。泡孔密度与泡孔尺寸之间的相关性遵循指数关系。超临界流体（SCF）促进了纳米粘土在微孔注射成型过程中的插层和剥离。研究了纳米粘土在微单元表面附近和微单元之间的取向，并观察到微单元周围的优先取向。微孔注射成型过程中纳米粘土促进了PA6的γ晶型，抑制了PA6的α晶型。纳米粘土和SCF都降低了部件的结晶度。微胞改善了纳米复合材料的归一化韧性。微泡和纳米粘土都对部件的机械性能有显着的影响，这取决于成型条件。
The microstructure and mechanical properties of microcellular injection molded polyamide-6 (PA6) nanocomposites were studied. Cell wall structure and smoothness were determined by the size of the crystalline structure, which, in turn, were based on the material system and molding conditions. The correlation between cell density and cell size of the materials studied followed an exponential relationship. Supercritical fluid (SCF) facilitated the intercalation and exfoliation of nanoclays in the microcellular injection molding process. The orientation of nanoclays near the surface of microcells and between microcells was examined and a preferential orientation around the microcells was observed. Nanoclays in the microcellular injection molding process promoted the γ-form and suppressed the α-form crystalline structure of PA6. Both nanoclays and SCF lowered the crystallinity of the parts. Microcells improved the normalized toughness of the nanocomposites. Both microcells and nanoclay had a significant influence on the mechanical properties of parts depending on the molding conditions.