温度对熔体挤出自增强HDPE棒材显微组织和力学性能的影响  

Influence of extrusion temperature on microstructure and mechanical properties of self-reinforced HDPE rods

作　　者：朱武[1] 黄苏萍[1] 周科朝[1] 李志友[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《材料科学与工艺》2008年第2期284-286,289,共4页Materials Science and Technology

基　　金：国家高技术发展计划资助项目(2003AA302210);湖南省自然科学基金资助(04JJ3083);中南大学创新工程基金资助(030615)

摘　　要：利用自制模具,在不同的温度下成功的制备了直径为7.2mm的自增强高密度聚乙烯(HDPE)棒材.通过SEM观察、DSC分析、WAXD分析与力学性能测试,研究挤出温度对熔体挤出自增强HDPE棒材微观结构和力学性能的影响.研究结果表明,挤出温度是影响熔体挤出自增强HDPE棒材结构和力学性能的重要参数.随着挤出温度的降低,自增强棒材的微晶尺寸和结晶度大幅提高,晶面间距几乎未变化,熔点向高温区发生漂移,试样内部有大量的微纤结构存在.在130℃下挤出棒材的拉伸强度和抗弯强度分别为220.6MPa和152.9MPa,都将近是未增强试样的10倍.Self - reinforced high density polyethylene （ HDPE ） rods with diameter of 7.2 mm were successful prepared at different temperatures using homemade mould. The influence of the temperature on microstructure and mechanical properties of self - reinforced HDPE rods was studied by SEM observation, WAXD analyses, DSC analyses and tensile strength measurement. The result shows that the extrusive temperature is a very im- portant parameter affecting-the structure and properties of the self - reinforced HDPE rods. With the decrea- sing of the extrusion temperature, the crystallite size and crystallinity of self - reinforced rods are promoted significantly, but the crystal face distance remains invariable. Melt points drift to the high temperature and there exist microfibrils in the self - reinforced rods in great bulk. The tensile strength and welding strength of the rods extruded at 130℃ are 220. 6 MPa and 152. 9 MPa respectively. They are nearly 10 times higher than those of un- reinforced samples.

关 键 词：高密度聚乙烯 熔体挤出 自增强 温度 结构与性能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]