• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Morphology control and ionic crosslinking of pectin domains to enhance the toughness of solvent cast PVA/pectin blends
【24h】

Morphology control and ionic crosslinking of pectin domains to enhance the toughness of solvent cast PVA/pectin blends

机译：果胶结构域的形态对照和离子交联，提高溶剂浇注PVA /果胶共混物的韧性

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

Blending water soluble synthetic polymers, such as polyvinyl alcohol (PVA), with natural polymers, such as pectin, has many advantages. However, due to the brittle nature of pectin, the mechanical properties become inferior in the blends. In this work, two strategies to enhance the toughness and tensile strength of solvent cast PVA/pectin blends are presented. This study shows that the tensile strength and toughness of PVA/pectin 80/20 blends can be enhanced by decreasing the solvent evaporation rate. The phase separation proceeds through 'nucleation and growth' and spinodal decomposition, respectively, at lower and higher rates of solvent evaporation. The equilibrium phase morphology has spherical domains of pectin dispersed in the PVA matrix. The size of the pectin domains and the separation between them are controlled by the solvent evaporation rate. At higher rates of solvent evaporation, pectin domains are larger and farther apart from each other and vice versa. Ionically crosslinking the pectin domains with calcium, further enhances the tensile strength and toughness of the blends compared to that of pure PVA. When the pectin domains are small, the failure happens at larger strains through 'cavitation' and 'shear yielding' and when pectin domains are large, the failure happens at smaller strains and the failure mechanism shifts to 'multiple crazing'.
机译：将水溶性合成聚合物（如聚乙烯醇（PVA））与天然聚合物（如果胶）混合具有许多优点。然而，由于果胶的脆性，共混物的力学性能变得较差。本文提出了两种提高溶剂浇铸PVA/果胶共混物韧性和拉伸强度的方法。研究表明，降低溶剂蒸发速率可以提高PVA/果胶80/20共混物的拉伸强度和韧性。在较低和较高的溶剂蒸发速率下，相分离分别通过“成核和生长”和调幅分解进行。平衡相形态为分散在PVA基质中的果胶球形区域。果胶结构域的大小及其分离受溶剂蒸发速率的控制。溶剂蒸发速率越高，果胶区域越大，彼此之间的距离越远，反之亦然。与纯PVA相比，用钙离子交联果胶域，进一步提高了共混物的拉伸强度和韧性。当果胶畴较小时，通过“空化”和“剪切屈服”在较大应变下发生失效，当果胶畴较大时，在较小应变下发生失效，失效机制转变为“多重银纹”。

著录项

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