【作者】 崔宏祥； 马玉春； 张建； 毕大森；

【Author】 CUI Hongxiang,MA Yuchun,Zhang Jian,Bi Dasen (Department of Materials Science and Engineering,Tianjin University of Technology Tianjin 300191)

【机构】 天津理工学院材料科学与工程系；

【摘要】 本文采用先进的等通道转角挤出方法对等规聚丙烯进行自增强挤出,研究和分析挤出工艺条件与材料结构、性能之间的关系。利用广角X-射线衍射(WAXD)、差示扫描量热分析(DSC)等手段对材料结构和性能进行表征,结果表明:经过等通道转角挤出后等规聚丙烯的结晶度提高、结构发生变化、熔点提高,形成明显的取向结构,经过3次等通道转角挤出,等规聚丙烯的抗拉强度由挤出前的17.13MPa提高到59.38MPa,提高幅度近2.5倍。讨论了该方法在实际生产中的应用可能性。更多还原

【Abstract】 The aim of this article is to explore the relationship between processing conditions,structures and the properties of isotactic polypropylene(i-PP) prepared by the new processing method of equal channel angular extrusion(ECAE).Wide-angular X-ray diffraction(WAXD).differential scanning calorimetry(DSC) experiments are applied to examinate the structure changing.Significant changes in crystalline and molecular orientation are taken place.The Degree of crystalline and the temperature of melt are increased.An increase of up to 2.5 times in tensile strength has been achieved with ECAE.更多还原