Structural Reorganization of a Polymeric Latex Film During Dry Sintering at Elevated Temperatures
Structural Reorganization of a Polymeric Latex Film During Dry Sintering at Elevated Temperatures
复制标题
高温干烧结过程中聚合物乳胶膜的结构重组
DOI：
10.1021/la201084j
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发表时间：
2011-07-05
期刊：
影响因子：
3.9
通讯作者：
Men, Yongfeng
中科院分区：
文献类型：
--
作者：
Chen, Xuelian;Fischer, Stefan;Men, Yongfeng
用同步加速器小角x射线散射研究了胶乳粉末在高于最低成膜温度的干燥烧结过程中的结构重排。确定了两个主要影响：(1)乳胶颗粒的变形导致它们之间的空隙闭合，并广泛完善了面心立方胶体晶体的有序。胶体晶体结构的这种改进涉及沿某些晶体学方向的优先晶体生长，这可以通过测量的晶体学（111）和（220）面不匹配的相对衍射强度分布来证明。(2)相邻颗粒之间聚合物链的相互扩散促进了先前位于颗粒间隙的非聚合物材料的纳米级聚集。采用考虑系统中分散球的模型，评价了不同干燥烧结条件下骨料的粒径和粒径分布。
Structural rearrangement in a latex powder during dry sintering at temperatures higher than the minimum film formation temperature was investigated by means of synchrotron small-angle X-ray scattering. Two major effects were identified: (1) Deformation of latex particles leads to a closure of voids between them and an extensive perfectioning of the face centered cubic colloidal crystalline ordering. Such an improvement of the colloidal crystalline structure involves preferential crystal growth along certain crystallographic directions as was evidenced by the measured unmatched relative diffraction intensity distribution of the crystallographic (111) and (220) planes. (2) Interdiffusion of polymeric chains between adjacent particles promotes a nanometer sized aggregation of nonpolymeric materials previously located in the interstices between particles. Size and size distribution of the aggregates at different dry sintering conditions were evaluated by using a model considering spheres dispersed in the system.