摘要
利用塑料电磁塑化挤出机挤出聚烯烃片材,系统研究了挤出机螺杆轴向振动对聚乙烯挤出制品结构与性能的影响。采用DSC对挤出试样的结晶结构及形态进行分析。结果表明,振动塑化挤出使聚合物挤出试样结晶度提高,结晶完善,晶片之间的连接分子数量增加,因而制品的力学性能有所提高,特别在横向上表现明显。在适当的振动条件下,高密度聚乙烯(HDPE)试样的横向拉伸强度和冲击强度分别从22.68 MPa和12.7 kJ/m2提高到了25.55 MPa和23.5 kJ/m2;而聚丙烯(PP)试样横向拉伸强度和冲击强度则分别提高了20%和64%。
The effect of vibration force field on the microstructure and mechanical properties of the polymer sample sheets extruded by electromagnetic dynamic plasticating extruder, was studied systematically. Differential Scanning Calorimetry （DSC） was executed to analyze the microstructure of the samples. The results indicated that the vibration plasticating extrudate had higher crystallinity, better crystallization, and the number of inter-lamellar connections increased, which account for enhancement of the mechanical properties of sheet, especially in transverse direction. The tensile strength and impact strength of extruded HDPE sheet in transverse direction increased from 22.68 MPa and 12.7 kJ/m^2 to 25.55 MPa and 23.5 kJ/m^2 respectively, the tensile strength and impact strength of PP samples in transverse direction were increased by 20% and 64% respectively.
出处
《现代塑料加工应用》
CAS
北大核心
2006年第3期33-36,共4页
Modern Plastics Processing and Applications
基金
国家自然科学基金面上项目(10472034)
国家自然科学基金重大项目(10590351)
关键词
高密度聚乙烯
聚丙烯
振动塑化
挤出
聚烯烃
微观结构
力学性能
结晶
high density polyethylene
polypropylene
vibration plasticating
extrusion
polyolefine
microstructure
mechanical properties
crystalline
