Role of gas delay time on the hierarchical crystalline structure and mechanical property of HDPE molded by gas-assisted injection molding

被引:18
|
作者
Wang, Long [1 ,2 ]
Yang, Bin [1 ,2 ,3 ]
Sun, Nan [1 ,2 ]
Zhang, Kai [1 ,2 ]
Feng, Jian-Ming [1 ,2 ]
Yang, Ming-Bo [1 ,2 ]
机构
[1] Sichuan Univ, Coll Polymer Sci & Engn, Chengdu 610065, Peoples R China
[2] Sichuan Univ, State Key Lab Polymer Mat Engn, Chengdu 610065, Peoples R China
[3] Anhui Univ, Coll Chem & Chem Engn, Hefei 230039, Peoples R China
基金
中国国家自然科学基金;
关键词
Delay time; Hierarchy structure; Mechanical property; HIGH-DENSITY POLYETHYLENE; PHASE-CHANGE; HEAT-CONDUCTION; COOLING PROCESS; SIMULATION; POLYPROPYLENE; MODEL; MELT; MORPHOLOGY; PARTS;
D O I
10.1007/s00396-012-2610-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The relationship among the processing parameters, crystalline morphology, and macroscopic properties in injected molded bar becomes very complicated due to existence of temperature gradient and shear gradient along the sample thickness. To enhance the shear strength, gas-assisted injection molding (GAIM) was utilized in producing the molded bars. The aim of our research was to explore the relationship between processing conditions and the spatial variation of the hierarchy structure as well as the mechanical properties of high-density polyethylene (HDPE) obtained via GAIM. In our previous work [Wang L, Yang B, Yang W et al (2011) Colloid Polym Sci 289:1661-1671], we found that the enhancement of the gas pressure can remarkably increase the degree of molecular orientation in the HDPE samples, which turns out to improve the mechanical performances of GAIM parts. In this work, the hierarchy structure, orientation behavior, and mechanical properties of molder bars under different gas delay time were investigated using a variety of characterization techniques including rheological experiments, scanning electron microscope, tensile testing, differential scanning calorimetry, and two-dimensional wide-angle X-ray scattering. Moreover, the temperature field during the short shot stage of GAIM process was simulated using an enthalpy transformation approach. Our results indicate that these properties were intimately related to each other, and with prolonged gas delay time, GAIM samples with higher degree of orientation and improved mechanical properties were obtained.
引用
收藏
页码:1133 / 1144
页数:12
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