【摘要】 利用自行研制的口模拉伸装置制备聚丙烯自增强线材,通过二维广角X射线衍射仪(2D-WAXD)、差示扫描量热仪(DSC)考察自增强线材熔融、结晶行为、晶体取向度;研究了实际拉伸比与自增强线材拉伸强度的关联性;考察了拉伸温度、实际拉伸比与热收缩性的关联性。结果表明,拉伸温度、实际拉伸比越高,聚丙烯自增强线材内部形成的微纤结构越完善,结晶度越高,热收缩性越好;拉伸温度为70℃和90℃时,拉伸强度随实际拉伸比的提高先增大后减小;而拉伸温度为115、130和150℃时,拉伸强度随实际拉伸比的提高先增大后基本保持不变。更多还原

【Abstract】 Self-reinforced polypropylene wires were produced by the self-designed die drawing device.The crystalline orientation and melt crystallization behaviors were measured by two-dimensional wide-angle Xray diffractometer( 2D-WAXD) and differential scanning calorimeter( DSC). The correlation between the actual draw ratio and the tensile strength of the self-reinforced polypropylene wire was investigated. The correlation between heating temperature with shrink characteristics, and the actual draw ratio with shrink characteristics were researched. The results indicate that the more perfect the microfiber structure of the selfreinforced wires is, and the higher the crystallinity is, the better the heat shrinkage is. When the draw temperatures are 70 and 90 ℃,the tensile strength firstly increases and then reduces with the increase of the actual draw ratio. But when the draw temperatures are 115,130 and 150 ℃,the tensile strength firstly increases and then remains almost unchanged with the increase of the actual draw ratio.更多还原