• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >The study of microcellular injection molded polyamide-6 composites.
【24h】

The study of microcellular injection molded polyamide-6 composites.

机译：微孔注塑聚酰胺6复合材料的研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study aims to explore the processing benefits and property improvements of combining nanocomposites and core-shell rubber composites with microcellular injection molding. The relationships among microstructures, thermal behaviors, mechanical properties, and molding conditions of microcellular nanocomposites were studied. Molding conditions and nanoclay contents were found to have profound effects on cell structures and mechanical properties of polyamide-6 (PA6) microcellular neat resin and microcellular nanocomposites. Microcellular nanocomposites exhibited smaller cell size and uniform cell distribution as well as higher tensile strength compared to the corresponding PA6 microcellular neat resin. Among the molding parameters studied, shot size had the most significant effect on cell size, cell density, and tensile strength. Fractographic study revealed evidence of different modes of failure and different structural features in the fractured regions depending on the molding conditions. The morphology of the crystalline structures determined by the material properties and the molding conditions influenced the cell wall structure and cell surface smoothness. The correlation between cell density and cell size followed an exponential relationship. Supercritical fluid (SCF) facilitated the intercalation and exfoliation of nanoclay in the microcellular molding process. Nanoclay acted as the nucleation agents for both cell and crystal formations. The addition of nanoclay increased the crystallization rate.; Nanocomposites with a proper amount of nanoclay exhibited the maximal magnitude of crystallization activation energy and produced fine and dense microcell structures, which leads to better mechanical properties. Nanoclay and PA6 crystallite lamella exhibited spatially preferential orientation in the parts. Both nanoclay and supercritical fluid lowered the crystallinity of the parts. Microcells improved the normalized toughness of the nanocomposites. The presence of both microcells and nanoclay rather than modifications of crystalline structures had a significant influence on the mechanical properties of the parts depending on the molding conditions.
机译：这项研究旨在探讨将纳米复合材料和核-壳橡胶复合材料与微孔注射成型相结合的加工益处和性能改进。研究了微孔纳米复合材料的微观结构，热行为，力学性能和成型条件之间的关系。发现模塑条件和纳米粘土含量对聚酰胺6（PA6）微孔纯树脂和微孔纳米复合材料的孔结构和机械性能产生深远影响。与相应的PA6微孔纯树脂相比，微孔纳米复合材料具有更小的孔尺寸和均匀的孔分布以及更高的拉伸强度。在研究的成型参数中，丸粒尺寸对孔尺寸，孔密度和拉伸强度影响最大。分形研究表明，取决于成型条件，断裂区域的破坏模式和结构特征不同。由材料性能和成型条件决定的晶体结构形态影响了细胞壁结构和细胞表面光滑度。细胞密度和细胞大小之间的相关性遵循指数关系。超临界流体（SCF）在微孔成型过程中促进了纳米粘土的嵌入和剥落。纳米粘土充当细胞和晶体形成的成核剂。纳米粘土的添加增加了结晶速率。具有适当数量的纳米粘土的纳米复合材料表现出最大的结晶活化能强度，并产生了细密的微孔结构，从而导致更好的机械性能。纳米粘土和PA6微晶片在零件中表现出空间优先的取向。纳米粘土和超临界流体都降低了零件的结晶度。微孔改善了纳米复合材料的归一化韧性。取决于模塑条件，微孔和纳米粘土的存在而不是晶体结构的改变对零件的机械性能有重大影响。

著录项

  • 作者

    Yuan, Mingjun.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Mechanical.; Plastics Technology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;整形外科学（修复外科学）;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号