文章摘要
聚甲基丙烯酸甲酯类固态温度区静态力学松弛特性
Static Mechanical Relaxation Characteristics of Polymethyl Methacrylate in Solid-Like State
  
DOI:10.16865/j.cnki.1000-7555.2018.07.010
中文关键词: 应力松弛  蠕变  保压时间  类固态等温热压印  聚甲基丙烯酸甲酯
英文关键词: stress relaxation  creep  holding time  isothermal hot embossing in solid-like state  polymethyl methacrylate
基金项目:国家自然科学基金资助项目(51673020)
作者单位
李 瑞1,吴大鸣1,2,刘 颖1,王 琦1,许 红1,孙靖尧1 1.北京化工大学 塑料机械与塑料工程研究所,北京 100029
2. 高分子材料加工装备教育部工程研究中心,北京 100029 
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中文摘要:
      为了探究聚甲基丙烯酸甲酯(PMMA)在类固态温度区静态力学松弛特性(蠕变与应力松弛)的相关规律,在保压模式下对其进行不同温度的蠕变实验,分析广义Kelvin模型、标准线性体模型、三元件修正模型建模结果,根据拟合效果最好的三元件修正模型参数和不同温度下定应变应力松弛实验,推导松弛模量表达式,结合理论模型,进行不同温度、不同保压时间条件下的半球阵列与Prism 微结构类固态等温热压印实验,为得到基于高复制精度和短压印周期的类固态等温热压印工艺提供理论与实验依据。
英文摘要:
      In order to investigate the static mechanical relaxation characteristics(creep and stress relaxation) of polymethyl methacrylate (PMMA) in the temperature zone of solid-like state, the creep experiments were carried out at different temperatures in the pressure-holding mode, and the modeling results of generalized Kelvin model, the standard linear model and the three-component correction model were analyzed. According to the stress relaxation experiments in constant strain at different temperatures and the parameters of the three-component correction model, which has best fitting effect, the expression of relaxation modulus was derived. Also, combined with the theoretical model, the experiments of the hemisphere array and Prism microstructure at different temperatures and different holding time were conducted by the novel method of isothermal hot embossing in solid-like state, and it provided experimental and theoretical basis for obtaining the process of isothermal hot embossing in solid-like state based on high replication precision and short embossing cycle.
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