硅烷交联UHMWPE非等温结晶动力学

Non-isothermal Crystallization Kinetics of Silane Compound-Induced Crosslinked UHMWPE

利用差示扫描量热分析(DSC)方法研究了超高分子量聚乙烯(UHMWPE),硅烷交联UHMWPE的非等温结晶动力学。通过Jeziorny法和Mo法分别对非等温结晶过程进行处理,结果表明:硅烷交联UHMWPE分子链之间形成的三维网状结构抑制了分子链及链段之间的相对运动,阻碍了分子链的规则排列,影响了链段在晶区扩散迁移规整排列的速度,使结晶速率变慢,对晶体生长产生抑制作用。但在所有的结晶速率下,试样的Avrami指数n的值均在1.6～2.0之间,说明交联对UHMWPE的结晶成核机理和生长方式没有改变。

The non-isothermal crystallization kinetics of UHMWPE and silane compound-induced crosslined UHMWPE were studied with differential scanning calorimetry （DSC）. Jeziorny and Mo for Non-isothermal crystallization Kinetics were used to analyze the crystallization characters. It was found that the crystallization rate of crosslinked UHMWPE was slower than the pure UHMWPE, due to stronger effect among rules arrangement of molecule chain and partial destruction of crystal. The rate of crystallization decreased and crystal growth slowed. The fact that all samples had Avrami exponents in a range of 1.6 - 2.0, implies the nucleation mechanism and geometry of crystal growth UHMWPE was not changed.