Ionic and chain interdiffusion and interfacial strength development in ionomers of poly(ethylene-co-methacrylic acid)
Ionic and chain interdiffusion and interfacial strength development in ionomers of poly(ethylene-co-methacrylic acid)
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DOI：
10.1021/ma950431f
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发表时间：
1996-03-11
期刊：
影响因子：
5.5
通讯作者：
VanAlsten, JG
中科院分区：
文献类型：
--
作者：
VanAlsten, JG
测量了钠离子和锌离子在商用、部分中和的聚甲基丙烯酸共聚物双层膜中的扩散系数。扩散行为在树脂的熔融温度出现断裂，表明链主链的运动与离子传输密切相关。离子扩散系数比主链的离子扩散系数大几个数量级，这表明金属离子对是通过与邻近酸基的质子交换而沿聚合物网络的轮廓传输的。离聚体焊接膜的界面强度发展主要由主体树脂的熔融行为决定。离子扩散速率与强度发展行为无关。这一观察结果以及熔融和链质量中心扩散信息表明，强度的发展依赖于链互扩散，就像许多其他热塑性塑料一样。
Diffusion coefficients of sodium and zinc ions have been measured in bilayers of commercial, partially neutralized poly(ethylene-co-methacrylic acid). The diffusion behavior shows a break at the melting temperature of the resin, suggesting that chain backbone motion is intimately related to ionic transport. The ionic diffusion coefficients are orders of magnitude greater than those of the chain backbone, which suggests that metal ion pairs are transported along the contour of the polymer network via exchange with protons of neighboring acid groups. Interfacial strength development in welded films of ionomers is primarily determined by the melting behavior of the bulk resin. Ionic diffusion rates do not correlate with the strength development behavior. This observation, along with melting and chain center of mass diffusion information, suggests that strength development is dependent on chain interdiffusion like that of many other thermoplastics.