超高相对分子质量聚乙烯固相挤出过程研究  

Study on Solid-state-extrusion Technology of Ultra-high-molecular-weight Polyethylene

作　　者：薛平[1] 毛旭琳[1] 丁文赢[1] 

机构地区：[1]北京化工大学塑料机械及塑料工程研究所,北京100029

出　　处：《中国塑料》2008年第12期53-57,共5页China Plastics

摘　　要：采用一种新型成型技术——固相挤出成型超高相对分子质量聚乙烯。采用扫描电子显微镜观察了制品成型前后内部微观结构变化;采用差示扫描量热分析,研究了不同挤出温度与口模拉伸比对挤出制品热性能的影响。结果表明,相对熔融挤出成型,固相挤出成型制品光滑、透明、密度较大;制品内部产生大量的微纤结构,结晶度提高,分子链取向增强,拉伸强度提高了2.7～4.5倍,拉伸弹性模量提高了42倍;另外,熔点上升了3～5℃、熔融焓及结晶度分别提高了8～10个百分点。A new extrusion technique, solid-state-extrusion was adopted for molding ultra-high-molecular-weight polyethylene（PE-UHMW）. The product by solid-state-extrusion was smoother, more transparent, and with a higher density than those based on regular extrusion. The microstructure of the products were studied using scanning electron microscope （SEM）, and the effects of extrusion tempera- ture and extrusion draw ratio on products＇ thermal property were investigated using differential scanning calorimetry （DSC）. It was found that a large quantity of micro-fiber was produced in the products of solid-state-extrusion. Compared with those by regular extrusion, it possessed a greater degree of molecular orientation, higher degree of crystallinity, and higher melting point. Besides, the tensile strength and modulus increased by 4.5 and 42 times based on regular extrusion ones.

关 键 词：超高相对分子质量聚乙烯 固相挤出 拉伸强度 弹性模量 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]