Using two-dimensional correlation dynamic mechanical spectroscopy to detect different modes of molecular motions in the glass-rubber transition region in polyisobutylene.
Using two-dimensional correlation dynamic mechanical spectroscopy to detect different modes of molecular motions in the glass-rubber transition region in polyisobutylene.
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DOI：
10.1021/jp110890n
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
Xiaoan Wang;Guangsu Huang;Jinrong Wu;Y. Nie;Xiaojun He
中科院分区：
文献类型：
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作者：
Xiaoan Wang;Guangsu Huang;Jinrong Wu;Y. Nie;Xiaojun He
本文首次利用二维相关动态力学光谱（2DC-DMS）研究了聚异丁烯中玻璃-橡胶过渡区的分子动力学。借助该技术的高分辨率和高灵敏度，子劳斯模式与劳斯模式和局部节段运动（LSM）独立分离。根据三种分子运动模式的自峰位置和宽度，采用非线性拟合方法将损耗切峰分解为三个峰。并将玻璃-橡胶过渡区划分为三个区域。2DC-DMS已被证明是研究不同时间/长度尺度分子运动的有力工具。
In this Article, we report the first study of the molecular dynamics in the glass-rubber transition region in polyisobutylene by 2D correlation dynamic mechanical spectroscopy (2DC-DMS). With the help of the high resolution and high sensitivity of the technique, the sub-Rouse modes are independently separated from the Rouse modes and local segmental motion (LSM). According to the positions and widths of autopeaks of three modes of molecular motions, the loss tangent peak is resolved into three peaks by nonlinear fitting method. Moreover, the glass-rubber transition region is divided into three regions. 2DC-DMS has been demonstrated to be a powerful tool for studying the molecular motions with different time/length scales.