Force‐induced melting of a single polyethylene oxide chain from single crystal: Molecular behavior and influencing factors
Force‐induced melting of a single polyethylene oxide chain from single crystal: Molecular behavior and influencing factors
复制标题
DOI：
10.1002/pcr2.10048
复制
发表时间：
2019-04
影响因子：
1.9
通讯作者：
Yu Song;Peng Yang;Ke Jiang;Wenke Zhang
中科院分区：
文献类型：
--
作者：
Yu Song;Peng Yang;Ke Jiang;Wenke Zhang
力诱导熔融在定义半结晶聚合物材料的机械强度和韧性方面起着关键作用。为了理解其分子机制，在单分子水平上直接测量和监测力诱导熔融过程是必要的。在这里，通过使用基于原子力显微镜的单分子力谱研究了来自单晶的单个聚环氧乙烷（PEO）链的力诱导熔融。恒速和恒力实验均表明，在力诱导熔融过程中，PEO折叠主要是一个接一个地展开。PEO折叠的机械稳定性随着聚合物溶剂界面张力和晶体厚度的增加而显著增加。这里获得的结果提供了新的概念，在调整结晶聚合物材料的纳米力学性能。
Force‐induced melting plays a key role in defining the mechanical strength and toughness of semicrystalline polymer materials. To understand its molecular mechanism, the direct measurement and monitoring of force‐induced melting process at the single‐molecule level are necessary. Here, the force‐induced melting of a single polyethylene oxide (PEO) chain from the single crystal has been investigated by using atomic force microscopy‐based single‐molecule force spectroscopy. Both the constant‐speed and constant‐force experiments show that PEO folds are unfolded predominantly one by one during the force‐induced melting process. The mechanical stability of PEO fold is confirmed to increase significantly with the increasing interfacial tension of polymer solvent and the thickness of crystal. The results obtained here provide new concepts in tuning the nanomechanical properties of crystalline polymer materials.