注塑成型过程中液晶高分子材料微流动的数值分析及可视化实验  

Numerical analysis and visualization test of liquid crystalline polymer micro-flow during injection molding

作　　者：刘春波[1] 张鹏 林绿叶 杨林杰 Liu Chunbo;Zhang Peng;Lin Lüye;Yang Linjie(College of Mechanical Engineering,Henan University of Technology,450001,Zhengzhou,China;Cixi Biomedical Engineering Research Institute,Ningbo Institute of Technology,Chinese Academy of Sciences,315201,Ningbo,China;Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,450007,Zhengzhou,China)

机构地区：[1]河南工业大学机电工程学院,郑州450001 [2]中国科学院宁波工业技术研究院慈溪生物医学工程研究所,宁波315201 [3]郑州机械研究所有限公司,郑州450000

出　　处：《应用力学学报》2020年第5期2222-2227,I0027,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11372003)。

摘　　要：选用典型的热致性液晶高分子材料VectraA950为研究对像,通过XRD和DSC实验确定其微观结构类型和注塑温度范围。为简化理论分析过程,以适用于小分子液晶的Leslie-Ericksen理论为基础,构建了数值分析微注塑成型过程的二维Hele-Shaw模型。以Maier-Saupe理论为基础,通过数值计算确定了Leslie黏度系数。数值分析得到微尺度下Vectra A950材料注塑成型过程的压力云图、速度廓线图、指向矢分布图等。此外,设计搭建了实验验证装置,模拟及实验注塑时间分别为1.588s与1.5s,吻合较好。The development of Micro-Electro-Mechanical System(MEMS) promotes the application of micro-injection molding technology. The micro-structure formed in the micro-injection molding process greatly affects the mechanical properties of the injection products. Therefore, it is necessary to study the rheological properties of liquid crystalline polymer under micro scale. In this paper, typical thermotropic liquid crystalline polymer Vectra A950 is selected as study object and through XDR and TG-DSC tests, the temperature range is determined to be around 280 degrees. In order to simplify the theoretical analysis process, a two-dimensional numerical model is constructed based on Leslie-Erickson theory. Based on Maier-Saupe theory, the viscosity coefficients are calculated numerically. The pressure nephogram, the flow front and the pointing vector distribution of the injection molding process under the micro-scale are obtained. The confirmatory experiments are set up and the results are consistent with the theoretical analysis results.

关 键 词：热致性 液晶高分子材料 Hele-Shaw模型 Leslie黏度系数 微流动 

分 类 号：O357[理学—流体力学]