摘要
研究了PVA水凝胶的动态力学性能.结果发现,在50℃以后,其模量随温度上升显著下降,说明物理交联的PVA水凝胶的氢键随温度升高被逐步打开,利用Arrhenius方程推算其活化能约为149.8 kJ/mol.当温度缓慢的下降,其氢键可以部分重建,与温度下降速率有明显的依赖关系.
Physical cross-linking polyvinyl alcohol（PVA） gels have been studied by using dynamic mechanical analysis.The results show that the shear modulus of gels was decreased with the increase of temperature after 50℃.The activation energies of hydrogen bonding dissociation have been evaluated as 149.8kJ/mol by using Arrhenius Law from the elastic modulus temperature relation of the gels.With temperature slowly decreasing,hydrogen bonding of the gels could be partly reconstructed,which has obvious temperature dependence of decreasing velocity.
出处
《湖北工业大学学报》
2010年第5期77-79,共3页
Journal of Hubei University of Technology
基金
湖北省建设科技项目计划([2009]260)
关键词
PVA水凝胶
动态力学性能
氢键
温度依赖性
polyvinyl alcohol gels
dynamic mechanical properties
hydrogen bonding
temperature dependence
