解开交替共聚物DMDS-alt-DVE的复杂多态结晶行为
Valentina Pirela1, Justine Elgoyhen1, Radmila Tomovska1,2
1POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry, and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain.
研究人员在DMDS-alt-DVE聚乙烯中发现了一种新的非常低化 (VL-Tm) 晶体相. 这一发现扩大了这些聚合物的已知多态性,对于开发先进的聚合物涂层至关重要.
科学领域:
- 聚合物科学与工程 聚合物科学与工程
- 材料化学 材料化学
- 晶体学 晶体学是指结晶学.
背景情况:
- 像DMDS-alt-DVE这样的交替共聚合物是具有聚合物涂层潜力的创新型聚乙烯.
- 之前的研究报告了DMDS-alt-DVE的两个晶体相 (L-Tm和H-Tm),其中H-Tm需要先化L-Tm.
- 了解复杂的结晶行为和多态性是优化材料性能的关键.
研究的目的:
- 为了彻底研究DMDS-alt-DVE交替共聚物的复杂多态行为.
- 在各种热条件下探索不同晶相之间的相互关系.
- 为了识别新的多态形式,除了之前报告的那些.
主要方法:
- 热度测量技术在扫描速率的七个数量级上使用.
- 快速火到环境下温度被用来诱导和检测新的晶体相.
- 设计了量身定制的热协议,以选择性地产生具有特定多态化合物的样本.
主要成果:
- 检测到一种以前未报告的多态形式,其特点是化温度非常低 (VL-Tm).
- 该研究成功生成了含有完全一个,两个或所有三个已识别的多态体 (VL-Tm,L-Tm,H-Tm) 的样本.
- 对这些不同的晶体相的相互关系和形成途径的洞察得到了深入的了解.
结论:
- DMDS-alt-DVE共聚物表现出比以前理解的更复杂的多态,包括一个新的VL-Tm阶段.
- 控制的热处理允许选择性地形成特定的多态体,从而实现量身定制的材料特性.
- 对聚乙烯多态性,结晶性和形态学的更深入的理解对于增强聚合物涂层等应用中的机械和屏障性质至关重要.
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