López-Díaz D, Velázqueza M M
Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca, E-37008-Salamanca, Spain.
Eur Phys J E Soft Matter. 2008 Aug;26(4):417-25. doi: 10.1140/epje/i2008-10343-2.
The glass transition temperature of poly (maleic anhydride-alt-1-octadecen) and poly (styrene-co-maleic anhydride) cumene-terminated thin films has been measured by mechanical relaxation of Langmuir films of these polymers. The dynamical properties show glass-like features (non-Arrhenius relaxation times and non-Debye mechanical response) interpreted by the coupling model. The glass transition temperature values determined by a mechanical relaxation experiment (step-compression) agree very well with those obtained by surface potential measurements. It is found that the glass transition temperature values in thin films decrease by about 100 K as compared with those corresponding to the bulk polymers. The coadsorption of the water-insoluble surfactant DODAB decreases the glass transition temperature.
通过这些聚合物的朗缪尔膜的机械弛豫测量了聚（马来酸酐-alt-1-十八碳烯）和聚（苯乙烯-co-马来酸酐）苯异丙基封端薄膜的玻璃化转变温度。动力学性质呈现出玻璃状特征（非阿累尼乌斯弛豫时间和非德拜力学响应），这由耦合模型来解释。通过机械弛豫实验（阶跃压缩）测定的玻璃化转变温度值与通过表面电势测量得到的值非常吻合。研究发现，与本体聚合物对应的玻璃化转变温度值相比，薄膜中的玻璃化转变温度值降低了约100K。水不溶性表面活性剂二油酰基二甲基溴化铵的共吸附降低了玻璃化转变温度。
