• 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 >Isocyanurate transformation induced healing of isocyanurate-oxazolidone polymers
【24h】

Isocyanurate transformation induced healing of isocyanurate-oxazolidone polymers

机译：异氰脲酸酯转化诱导异氰脲酸盐 - 恶唑烷聚合物的愈合

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

Isocyanurate-oxazolidone (ISOX) polymers have been reported as a novel, intrinsically self-healable thermoset, and their healing mechanism under the effect of nucleophiles, such as tertiary amines and pyridines during polymerization, is thoroughly investigated in this study. This work provides evidence that the healing behavior of the polymers results part from the transformation of isocyanurate to oxazolidone on the fracture surfaces of the ISOX polymers at elevated temperatures. The isocyanurate transformation is characterized by chemical composition of the ISOX polymers before and after a predetermined healing procedure, through a combination characterization of Fourier transform infrared spectroscopy and carbon nuclear magnetic resonance spectroscopy. From the chemical composition of the ISOX polymers, an increased oxazolidone fraction is observed after the healing event, which verifies the hypothesized healing mechanism. By correlating the change in oxazolidone fraction in the polymers during the healing event, with the corresponding healing performance of the polymers, healing efficiencies of the polymers are shown to be inversely proportional to the ratio of oxazolidone to isocyanurate in the polymers. The transformation to oxazolidone is also shown to be dependent on two variables, nucleophilicity of the polymerization catalyst and duration of the postcure. The isocyanate and epoxide polymerization mechanism in the presence of nucleophiles is also investigated to explain the effect of the catalyst nucleophilicity on the chemical composition as well as the healing performance of the ISOX polymers. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48698.
机译：异氰脲酸酯 - 恶唑烷（异氧苯胺）聚合物已被报告为新颖的，本质上自我愈合的热固性，并且在本研究中，在聚合过程中，在聚合过程中的亲胺和吡啶的乳酰胺和吡啶的愈合机制中进行了彻底研究。这项工作提供了证据表明聚合物的愈合行为结果从异氰脲酸酯转化到恶唑烷酮在升高的温度下的肌蛋白聚合物的裂缝表面上。异氰脲酸酯转化的特征在于通过傅里叶变换红外光谱和碳核磁共振光谱的组合表征在预定的愈合程序之前和之后的异氧聚合物的化学成分。从肌氧聚合物的化学成分，在愈合事件后观察到增加的恶唑烷酮级分，这验证了假设的愈合机制。通过在愈合事件期间与聚合物中的恶唑烷酮部分的变化相关，随着聚合物的相应愈合性能，将聚合物的愈合效率显示成与聚合物中恶唑烷酮与异氰脲酸酯的比例成反比。对恶唑烷酮的转化也显示为依赖于两个变量，聚合催化剂的亲核性和后施加的持续时间。还研究了异氰酸酯和环氧化物聚合机制在亲核试剂存在下，以解释催化剂亲核性对化学组合物的影响以及异氧酰基聚合物的愈合性能。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48698。

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