结晶过程及支链对正交晶精细结构的影响

Effect of Crystallization and Branch on Fine Structure of Orthorhombic in Polyethylene

用低温高分辨FTIR研究了EG系列乙烯 辛烯共聚物 ,通过对亚甲基rockingband的表征 ,结果表明 ,在支链不进入晶格的情况下 ,主链上支链的引入仍能引起晶格结构的变化 ,这种变化表现在正交晶格内分子链的距离的变化 ,二面角的变化和结晶规整程度的变化 ,并且发现不同的结晶过程对晶格的变化有不同的影响。

The CH2 rocking bands are used as a probe to monitor the crystalline behavior of polyethylene segments in a series of poly (ethylene-octene) copolymers. High resolution and cryogenic FTIR spectra reveal that different composition and for crystalline condition of the copolymers result in significant variation on the CH2 rocking bands including the change in peak position, band width and A(730)/A(720). We conclude that side chain in the copolymer can influence the structure of the orthorhombic polyethylene crystallite although they can not enter the crystal lattice.