Akkök B, Pekcan O, Arda E
Department of Physics, Istanbul Technical University, Maslak, Istanbul, 80626, Turkey.
J Colloid Interface Sci. 2002 Jan 15;245(2):397-401. doi: 10.1006/jcis.2001.7929.
Two different sets of powder latex film were prepared from high- and low-molecular-weight (HM and LM) poly(methyl methacrylate) (PMMA). The optical transmission method was used to the study film formation induced by organic vapor. Various HM and LM films with the same latex content were prepared separately from the PMMA particles and exposed to vapor of a chloroform-heptane mixture in various volume percents of chloroform. Transmitted light intensities, I(tr), from these films increased in time under vapor exposure, which was attributed to the increase in "crossing density" at the junction surface. The Prager-Tirrell model was employed to obtain the back-and-forth frequency, nu, of the reptating polymer chain during film formation induced by solvent vapor. nu values were obtained and found to be strongly correlated with the percent of chloroform in the solvent mixture and the molecular weight of the polymer chain. It is observed that high-molecular-weight chains reptate much more slowerly than low-molecular-weight chains.
由高分子量（HM）和低分子量（LM）的聚甲基丙烯酸甲酯（PMMA）制备了两组不同的粉末乳胶膜。采用光透射法研究有机蒸汽诱导的成膜过程。从PMMA颗粒分别制备了具有相同乳胶含量的各种HM和LM膜，并将其暴露于氯仿体积百分比不同的氯仿 - 庚烷混合蒸汽中。在蒸汽暴露下，这些膜的透射光强度I(tr)随时间增加，这归因于交界表面“交联密度”的增加。采用Prager-Tirrell模型来获得溶剂蒸汽诱导成膜过程中爬行聚合物链的来回频率ν。获得了ν值，发现其与溶剂混合物中氯仿的百分比以及聚合物链的分子量密切相关。观察到高分子量链的爬行速度比低分子量链慢得多。
