...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Unique crystallization behaviors of isotactic polypropylene in the presence of MWCNT supported beta nucleating agent: Lower temperature T(alpha beta)-T(beta alpha) interval and fast cooling preferred formation of b crystals
【24h】

Unique crystallization behaviors of isotactic polypropylene in the presence of MWCNT supported beta nucleating agent: Lower temperature T(alpha beta)-T(beta alpha) interval and fast cooling preferred formation of b crystals

机译：在MWCNT支撑的β成核剂存在下，全同立构聚丙烯的独特结晶行为：较低的T（α-β）-T（β-α）温度区间和较快冷却的b晶体优选形成

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

Simultaneous improvement of stiffness and toughness of isotactic polypropylene (iPP) has caught tremendous effort for decades and previously we have shown that the modification of iPP with combined nanofillers and beta-nucleating agent (beta-NA) is an efficacious way to balance its stiffness and toughness. However, simultaneous introduction of reinforcing fillers and beta-NA generates nucleation competition in the crystallization process and generally the formation of beta crystals is depressed, while the nucleation competition induced by beta-NA grafted onto the surface of reinforcing fillers was not clear yet. In this work, a kind of novel beta-NA for iPP, N, N'-dicyclohexyl-1,5-diamino-2,6-naphthalenedi-carboxamide, was supported onto the surface of multi-walled carbon nanotubes (MWCNTs) through chemical bonds. The alpha and beta nucleating competition among iPP nucleated by beta-NA, physically mixed MWCNTs and beta-NA (MWCNT + NA), and MWCNT supported beta-NA (MWCNT-NA) was systematically investigated. Interestingly, in the presence of MWCNT-NA, iPP showed unique crystallization behaviors. The nucleation competition between alpha- and beta-crystals became intensified and showed temperature dependence, and the relative content of beta-crystals increased with increasing cooling rate, which is opposite to the general understanding of crystallization behaviors of semicrystalline polymers, but is highly desired in practical productions. A possible interpretation for this unusual crystallization behavior of iPP is provided. (C) 2016 Elsevier Ltd. All rights reserved.
机译：等规聚丙烯（iPP）的刚度和韧性的同时提高已经花费了数十年的努力，以前，我们已经证明，结合纳米填料和β-成核剂（β-NA）对iPP进行改性是平衡其刚度和强度的有效方法。韧性。然而，同时引入增强填料和β-NA在结晶过程中会产生形核竞争，并且通常抑制了β晶体的形成，而由接枝到增强填料表面上的β-NA诱导的形核竞争尚不清楚。在这项工作中，一种新型的用于iPP的β-NA通过N，N'-二环己基-1,5-二氨基-2,6-萘二甲酰胺被支撑到多壁碳纳米管（MWCNTs）的表面上。化学键。系统地研究了由β-NA，物理混合的MWCNT和β-NA（MWCNT + NA）以及MWCNT支持的β-NA（MWCNT-NA）成核的iPP之间的α和β成核竞争。有趣的是，在MWCNT-NA的存在下，iPP表现出独特的结晶行为。 α和β晶体之间的成核竞争加剧并显示出温度依赖性，并且β晶体的相对含量随冷却速率的增加而增加，这与对半结晶聚合物的结晶行为的一般理解相反，但在实际生产。提供了对iPP这种异常结晶行为的可能解释。 （C）2016 Elsevier Ltd.保留所有权利。

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