摘要
利用自制的剪切拉伸双向复合应力场挤管装置生产出双向自增强的高密度聚乙烯(PE-HD)管材,研究分析了双向应力场对PE-HD管材的拉伸强度、微观分子取向和结晶度的影响。结果表明,剪切拉伸双向复合应力场能实现管材轴周向性能的双向自增强,提高管材分子的取向度和结晶度;其轴向拉伸强度最高增强到25.82MPa,提高了14.8%,周向拉伸强度最高增强到24.52MPa,提高了13%;其分子结构由明显的球晶结构转变为高度取向的串晶结构,结晶度达到71.95%。
Through a shearing-drawing two-dimensional stress field applied in a pipe-extrusion die developed by this group, two-dimensional self-reinforcement high density polyethylene （PE-HD） pipes were prepared. The tensile strength, molecule orientation and crystallinity of the pipe were studied. It showed that the two-dimensional stress field improved the molecule orientation and crystallinity, and the circular and axial tensile strength of the pipes were improved simultenously. The best circular and axial tensile strength were 24. 52 MPa and 25.82 MPa, increased by 13 % and 14. 8 % , respectively, based on regular pipes. The crystallinity was increased to 71.95 % . A shish kebab structure was observed.
出处
《中国塑料》
CAS
CSCD
北大核心
2011年第9期75-78,共4页
China Plastics
关键词
高密度聚乙烯
剪切拉伸双向复合应力场
双向自增强
取向
结晶
high density polyethylene
shearing-drawing two-dimensional compound stress field
two-dimensional self-reinforcement
orientation
crystallinity
