中国塑料2017，Vol.31Issue(12)：78-83,6.DOI:10.19491/j.issn.1001-9278.2017.12.014
PMMA在类固态微热压印过程中冷却速率与松弛速率的规律分析
Relationship between Cooling Rate and Relaxation Rate of PMMA During Micro Hot Embossing Process in Solid-like State
李瑞 1吴大鸣 1王琦 2刘颖 1孙靖尧 2曹亚楠1
作者信息
- 1. 北京化工大学机电工程学院,北京100029
- 2. 有机无机复合材料国家重点实验室,北京100029
- 折叠
摘要
Abstract
This paper reported an investigation on the relationship between cooling rate and relaxation rate of poly(methyl methacrylate)(PMMA) during the micro hot embossing process in a solid-like state.A relaxation-rate-temperature index model was established on the basis of the experimental data of stress relaxation of PMMA at different temperature,and then the relaxation rate and relaxation time constants of PMMA at different temperatures were calculated.A relaxation stress rate-cooling rate equation was determined for PMMA in an integral form,which could continuously obtain the relaxation stress rate at different cooling rates.A prism microstructural hot embossing experiment was conduced to verify the practicality of stress rate-cooling rate model through the comparison of the theoretical and experimental results.The results indicated that the relaxation stress rate became smaller with an increase of cooling rate,and the internal stress gained a more suffident relaxation.This led to a higher molding accuracy for the microstructure.关键词
应力松弛/冷却速率/松弛速率/类固态微热压印/聚甲基丙烯酸甲酯Key words
stress relaxation/cooling rate/relaxation rate/micro hot embossing in solid state/poly(methyl methacrylate)分类
化学化工引用本文复制引用
李瑞,吴大鸣,王琦,刘颖,孙靖尧,曹亚楠..PMMA在类固态微热压印过程中冷却速率与松弛速率的规律分析[J].中国塑料,2017,31(12):78-83,6.
