Correlations between alkyl side chain length and dynamic mechanical properties of poly(n-alkyl acrylates) and poly(n-alkyl methacrylates)
Correlations between alkyl side chain length and dynamic mechanical properties of poly(n-alkyl acrylates) and poly(n-alkyl methacrylates)
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聚丙烯酸正烷基酯和聚甲基丙烯酸正烷基酯的烷基侧链长度与动态力学性能的相关性
DOI：
10.1016/j.polymer.2011.11.059
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发表时间：
2012-01
期刊：
影响因子：
4.6
通讯作者：
Wu, Jinrong
中科院分区：
文献类型：
--
作者：
He, Xiaojun;Wang, Xiaoan;Huang, Guangsu;Wu, Jinrong
研究了不同烷基侧链长度的聚甲基丙烯酸正烷基酯（PnAMA）和聚丙烯酸正烷基酯（PnAA）的动态力学性能。结果表明，随着烷基侧链长度的增加，PnAA和PnAMA的储能模量变化更加平稳，损耗模量峰和tanδ峰变宽。同时，tanδ峰与损耗模量峰和储能模量开始下降的点越来越远。为了定量分析烷基侧链长度对动态力学性能的影响，定义了陡度指数（S）、储能模量转变宽度（W）和tanδ积分面积（A）3个变量，研究了烷基侧链长度对动态力学性能的影响。可以观察到，随着烷基侧链长度的增加，S减小，而W和A增加。此外，从相应的力学谱计算了这两个系列的聚合物的弛豫谱。随着烷基侧链长度的增加，弛豫谱的形状越来越宽。这些现象从脆性、分子堆积效率和分子间耦合的角度进行了解释。
In the present paper, dynamic mechanical properties of poly(n-alkyl acrylates) (PnAA) and poly(n-alkyl methacrylates) (PnAMA) with different alkyl side chain length were studied. The results show that with the increase of alkyl side chain length, the storage modulus changes more steadily, and the loss modulus peak and the tanδ peak become broader for PnAA and PnAMA. At the same time, the tanδ peak is more and more apart from the loss modulus peak and the point where the storage modulus begins to drop. For quantitative discussion, three variables, the steepness index (S), the transition wideness (W) of storage modulus and the integration area (A) of tanδ were defined to investigate the potential correlation between the dynamic mechanical properties and alkyl side chain length. It can be observed that S decreases while W and A increase with increasing alkyl side chain length. Moreover, the relaxation spectra of the two series of polymers are calculated from the corresponding mechanical spectra. The shapes of the relaxation spectra are broader and broader with the increase of the alkyl side chain length. These phenomena are interpreted by the perspective of fragility, molecular packing efficiency and intermolecular coupling.
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影响因子：
4.6
作者：
M. Erber;A. Khalyavina;K. Eichhorn;B. Voit
通讯作者：
M. Erber;A. Khalyavina;K. Eichhorn;B. Voit
影响因子：
2.3
作者：
Roman M. Balabin
通讯作者：
Roman M. Balabin
影响因子：
5.5
作者：
FLOUDAS, G;PLACKE, P;NGAI, KL
通讯作者：
NGAI, KL
影响因子：
2.3
作者：
K. Ngai;D. Plazek;R. Rendell
通讯作者：
K. Ngai;D. Plazek;R. Rendell
DOI：
10.1063/1.1826031
发表时间：
2005
期刊：
The Journal of chemical physics
影响因子：
--
作者：
M. Wind;R. Graf;S. Renker;H. Spiess;W. Steffen
通讯作者：
M. Wind;R. Graf;S. Renker;H. Spiess;W. Steffen