Quantification for the Mixing of Polymers on Microspheres in Waterborne Latex Films
Quantification for the Mixing of Polymers on Microspheres in Waterborne Latex Films
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DOI：
10.1021/acs.langmuir.0c00612
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发表时间：
2020-05-12
期刊：
影响因子：
3.9
通讯作者：
Shibayama, Mitsuhiro
中科院分区：
文献类型：
--
作者：
Kureha, Takuma;Hiroshige, Seina;Shibayama, Mitsuhiro
尽管已经付出了巨大的努力来进行结构分析和理解胶乳膜的韧性，其中软弹性体微球是互穿的，但是定量分析聚合物链在微球表面的混合，即，聚合物链上的亲水性带电基团通过老化而离域，尚未建立。在这项研究中，小角X射线散射被施加到表征乳胶膜通过假设一个伪两相系统，其中包括一个平均电子密度微球核心和高电子密度微球界面之间的界面，由于本地化的带电基团。由此获得的参数，即，特征界面厚度（t（inter））定量地反映了微球表面上聚合物链的混合程度。我们发现，t（inter）是强烈相关的乳胶膜的断裂能。因此，所提出的分析方法的微观混合的聚合物的微球表面上的膜，可以预期阐明工业乳胶膜的设计准则，并对这种膜的机械性能的理解。
Although tremendous efforts have been devoted to the structural analysis and understanding of the toughness of latex films, in which soft elastomer microspheres are interpenetrated, a method to quantitatively analyze the mixing of polymer chains at the microsphere surface, i.e., delocalization of hydrophilic charged group on the polymer chains by aging, has not yet been established. In this study, small-angle X-ray scattering was applied to characterize latex films by assuming a pseudo-two-phase system, which consists of an average-electron density microsphere core and a high-electron density interphase between the microsphere interfaces due to localized charged groups. The thus obtained parameter, i.e., the characteristic interfacial thickness (t(inter)), quantitatively reflects the degree of mixing of polymer chains on the microsphere surface. We found that t(inter) is strongly correlated to the fracture energy of the latex films. The proposed analysis method for the microscopic mixing of polymers on the microsphere surface in the film can thus be expected to shed light on design guidelines for industrial latex films and on the understanding of the mechanical properties of such films.