摘要
研究了硅烷交联和过氧化物交联对超高分子量聚乙烯结晶结构及力学性能的影响。DSC分析表明,超高分子量聚乙烯接枝硅烷后熔融热焓、结晶度稍有提高,但其熔点有所下降,熔限变窄,说明其晶体减小;而水解交联反应会造成热焓、结晶度下降,熔融起始温度提高很大。结果表明,当硅烷水解交联反应温度高于起始熔融温度时,较高的水解交联温度会造成一些不完善晶区熔融消失从而降低结晶度。热变形温度、维卡软化点及高温拉伸强度的测试说明,由于结晶度及结晶结构的改变,交联超高分子量聚乙烯的杨氏模量降低,硅烷交联提高了超高分子量聚乙烯的高温拉伸强度。
The effects of silane crosslinking and peroxide crosslinking on the crystallization behaviors and the mechanical properties of crosslinked ultra-high molecular weight polyethylene (UHMWPE) were studied.The analysis of DSC showed that the crystallinity and melting enthalpy (ΔH ) of silane grafted UHMWPE kept no change,but melting point went down,and the melting rate was accelerated.The experiment indicated that the crystal size of silane grafted UHMWPE was smaller than that of pure UHMWPE.Although the temperature of the hydrolytic condensation reaction was lower than the melting point of the UHMWPE,some irregular crystal region was destroyed in this reaction,so the crystallinity of silane crosslinked UHMWPE was decreased,and the starting melt temperature was enhanced from 81.5℃ to 98.83℃ after hydrolytic condensation reaction.The tensile test at 120℃ indicated that the Young's modulus of the silane crosslinked UHMWPE was lower than that of pure UHMWPE,and after yield point,the tensile strength of silane crosslinked UHMWPE was higher than that of pure UHMWPE.
出处
《塑料》
CAS
CSCD
2004年第1期1-4,26,共5页
Plastics
关键词
超高分子量聚乙烯
硅烷交联
过氧化物交联
结晶结构
力学性能
ultra-high molecular weight polyethylene
silane crosslinking
peroxide crosslinking
crystallinity
