苯乙烯-马来酸酐共聚物单分子膜的静、动态性质

Static and Dynamic Behavior of Poly(styrene-maleic anhydride) Monolayer

对不同分子量的苯乙烯 -马来酸酐共聚物 (PSM)单分子膜的π A等温线、微分曲线进行了研究 ,讨论了PSM单分子膜成膜过程及分子量对膜相变的影响 ,并用动态膜障振动法测定了PSM单分子膜的动态弹性 .结果表明 ,分子链的相互作用 (如卷曲和缠结 )在膜的形成中起着重要的作用 ,并影响膜的静、动态性质 .单分子膜的动态弹性曲线有双峰 ,且前者比后者小 .随分子量增大 ,膜的凝聚性、刚性和稳定性都增强 ,动态弹性都增大 ;且分子链的相互作用对PSM单分子膜性质影响增大 。

Based on measuring and analyzing the pi-A isotherms and their differentiate curves for monolayer of poly(styrene-maleic anhydride) (PSM) copolymer monolayer with different molecular weight, the formation and the effect of molecular weight on the phase transition of PSM monolayer were discussed in detail. The dynamic elasticity of each monolayer was determined by barrier oscillation method. It is shown that the interactions such as skew and twist of the macromolecular chains have great effect on the formation, the static and dynamic behavior of PSM monolayer. And the value of dynamic elasticity of the PSM monolayer is bigger in solid state than the one in liquid state. With increasing of molecular weight, the condensability, the rigidity, the stability and the dynamic elasticity of the PSM monolayer are all enhanced. With increasing of molecular weight, the phase transition of PSM monolayer becomes more complicated, the viscidity of the PSM monolayer is enhanced and the relaxation behavior of PSM monolayer becomes more obvious.