Dynamic mechanical analysis of sulfonated polyurethane ionomers
Dynamic mechanical analysis of sulfonated polyurethane ionomers
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磺化聚氨酯离聚物的动态力学分析
DOI：
10.1002/app.1992.070450618
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发表时间：
1992
影响因子：
3
通讯作者：
R. Chen
中科院分区：
文献类型：
--
作者：
Jianfu Ding;G. Xue;Chang;R. Chen
采用片簧支撑试样的动态力学分析方法，研究了以聚环氧氯丙烷为多元醇制备的聚氨酯离聚体的性能。研究了软段长度和电离水平对性能的影响。对于非离子化的聚氨酯，由于多元醇的高极性，软段和硬段具有良好的相容性，几乎没有相分离。对于较短的硬段离聚物，随着电离水平的增加，由于硬段和软段的相容性增加，基体Tg上升。对于较长的电离硬段离聚物，离子对的聚集倾向增强相分离。淬火或退火样品表明，存在于块体材料中的团簇在低于降解温度下不会解离，并且多重态可以在低于150°C下解离或转化为团簇。
Dynamic mechanical analysis, using a flat-spring to support the sample, was conducted to study the properties of polyurethane ionomers prepared from poly(epoxy chloropropane) as polyol. The effects of the soft segment length and ionization level on the properties were studied. For the unionized polyurethane, the soft and hard segments had good compatibility and little phase separation was found due to the high polarity of the polyol. For the shorter hard segment ionomers, as the ionization level increased, the matrix Tg rose due to the increase in the compatibility of hard and soft segments. For the longer ionized hard segment ionomers, the aggregating tendency of ion pairs enhanced phase separation. Quenching or annealing the samples showed that clusters existing in bulk materials did not dissociate below the degradation temperature and multiplets can dissociate or transform to clusters below 150°C.