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.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第12期53-57,共5页
China Plastics
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
ultra-high-molecular-weight polyethylene
solid-state-extrusion
tensile strength
elastic modulus
