PMMA压痕回复的二阶反应动力学方法分析  

Second-Order Kinetics of Indentation Recovery in Polymethyl Methacrylate

作　　者：蒋旭[1] 罗利[1] 程世玉[1] 蒋有能[1] 丁燕怀[1,2] 张平[1,2] 

机构地区：[1]湘潭大学土木工程与力学学院 [2]湘潭大学流变学研究所,湖南湘潭411105

出　　处：《高分子材料科学与工程》2012年第12期44-46,共3页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51002128);教育部大学生创新性实验计划项目(101053029);湘潭大学自然科学研究项目(2011x2x19)

摘　　要：通过原子力显微镜结合纳米压痕表征了聚甲基丙烯酸甲酯(PMMA)表面压痕的深度回复,考察了温度对压痕回复速率的影响。结果表明,初期压痕深度迅速回复,经过3 h左右压痕深度不再发生变化。随着实验温度的升高,压痕残余深度迅速降低,20℃时压痕残余深度约为120 nm,50℃时压痕残余深度降低到约10nm。采用二阶反应动力学方法对粘弹性压痕回复进行了分析,结果表明,该方法能够有效地预测压痕的粘弹性深度回复。The temperature-dependent indent recovery of polymethyl methacrylate （PMMA） was measured by atomic force microscopy （AFM）. The recovery rate decreases significantly along with the passage of the time. With the annealing temperature increasing, the permanent deformation reduces from 120nm of 20 ℃ to 10nm of 50 ℃, and the recovery rate increases greatly. The viscoelastic indent recovery was studied by second-order kinetics method. The variation of the viscoelastic deformation with time was found to follow second order kinetics for the indentation recovery. It may be a method for the prediction of deformation recovery on the polymer surface.

关 键 词：原子力显微镜 纳米压痕 回复 二阶反应动力学 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]