剪切历史对微注塑制品形态结构和力学性能的影响

doi:10.11949/j.issn.0438-1157.20141661

化工学报 ›› 2015, Vol. 66 ›› Issue (5): 1931-1938.DOI: 10.11949/j.issn.0438-1157.20141661

• 材料化学工程与纳米技术 • 上一篇下一篇

剪切历史对微注塑制品形态结构和力学性能的影响

王佳佳^1,2, 王利霞^1,2, 卞宁², 王东方², 王永贞², 张杨¹, 李倩^1,2, 申长雨²

1 郑州大学微纳成型技术国家级国际联合研究中心, 河南郑州 450001;
2 郑州大学橡塑模具国家工程研究中心, 河南郑州 450002

收稿日期:2014-11-05 修回日期:2015-01-30 出版日期:2015-05-05 发布日期:2015-05-05
通讯作者: 王利霞
基金资助:
国家自然科学基金项目(11372287);高等学校博士学科点专项科研基金项目(20124101110007)。

Influence of shear history on morphology, microstructure and mechanical properties of micro injection molded parts

WANG Jiajia^1,2, WANG Lixia^1,2, BIAN Ning², WANG Dongfang², WANG Yongzhen², ZHANG Yang¹, LI Qian^1,2, SHEN Changyu²

1 International Joint Research Laboratory for Micro-Nano Moulding Technology, Zhengzhou University, Zhengzhou 450001, Henan, China;
2 National Engineering & Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, Henan, China

Received:2014-11-05 Revised:2015-01-30 Online:2015-05-05 Published:2015-05-05
Supported by:
supported by the National Natural Science Foundation of China (11372287), the Specialized Research Fund for the Doctoral Program of High Education of China(20124101110007).

摘要/Abstract

摘要： 以厚度1、0.5和0.2 mm的微制品为研究对象,采用等规聚丙烯(iPP)材料进行微注塑实验,通过改变注射速度研究剪切历史对制品内部形态结构和力学性能的影响,并对微制品内部形态结构和力学性能的影响关系进行分析,不同注射速度下的剪切历史采用Moldflow分析获得。结果表明:1 mm和0.5 mm微制品厚度方向均呈现皮芯结构,且皮芯交界处的过渡层出现不完善的串晶层,0.2 mm微制品呈现含有柱晶结构的皮芯分层结构。对于3种厚度的微制品,熔体整体剪切水平随着注射速度的提高而提高,1 mm和0.5 mm制品的皮层厚度随注射速度增大而减小,模量、断裂强度和断裂伸长率均随皮层厚度增大而增大,屈服应力变化不明显,0.2 mm制品的皮层厚度随着注射速度的增大而增大,且随着皮层厚度的增大,断裂强度、模量和屈服应力增大,断裂伸长率逐渐减小。

关键词: 微注塑成型, 微尺度, 等规聚丙烯, 剪切历史, 结晶, 形态, 显微结构, 力学性能

Abstract: Micro injection molding experiments were conducted to investigate the influence of shear history on morphology, microstructure and mechanical properties of the micro-scale parts by changing injection speed based on the iPP parts with thickness of 0.2, 0.5 and 1 mm. Shear rate was analyzed with software Moldflow. Skin-core structure appeared in the thickness direction in both 0.5 mm and 1 mm parts, and imperfect shish-kebab structure appeared in the transition layer between skin layer and core layer of 0.5 mm and 1 mm parts, however, column crystal was shown in the transition layer of 0.2 mm parts. The whole shear level in shear history increased with increasing injection speed for all the parts with three thicknesses. The ratio of skin layer of 0.5 mm and 1 mm parts decreased with increasing injection speed, and yield stress, elongation at break, breaking strength and modulus decreased as the ratio of skin layer decreased. For 0.2 mm parts, the ratio of skin layer increased with increasing injection speed, and yield stress, breaking strength, modulus increased with increasing ratio of skin layer, while elongation at break decreased.

Key words: micro-injection molding, microscale, isotactic polypropylene, shear history, crystallization, morphology, microstructure, mechanical properties

中图分类号:

TQ320.66⁺2

王佳佳, 王利霞, 卞宁, 王东方, 王永贞, 张杨, 李倩, 申长雨. 剪切历史对微注塑制品形态结构和力学性能的影响[J]. 化工学报, 2015, 66(5): 1931-1938.

WANG Jiajia, WANG Lixia, BIAN Ning, WANG Dongfang, WANG Yongzhen, ZHANG Yang, LI Qian, SHEN Changyu. Influence of shear history on morphology, microstructure and mechanical properties of micro injection molded parts[J]. CIESC Journal, 2015, 66(5): 1931-1938.

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剪切历史对微注塑制品形态结构和力学性能的影响

Influence of shear history on morphology, microstructure and mechanical properties of micro injection molded parts

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