【作者】 吴彤； 闰明涛； 吴丝竹； 吴刚；

【Author】 Tong WU, Mingtao Run, SizhuWu, Gang WUKey Laboratory of Beijing City on "Preparation and Processing of Novel Polymer Materials", College of Materials Science & Engineering, Beijing University of Chemical & Technology, Beijingl00029

【机构】 新型高分子材料制备与加工北京市重点实验室北京化工大学材料科学与工程学院；

【摘要】 <正> 在mLLDPE/EVA共混体系中,由于EVA的存在,改变了mLLDPE分子链段所处环境和茂金属聚乙烯固有的聚集态结构,从而导致共混物形态结构、力学性能、流变性能、动态粘弹性能和热性能等发生变化。对于mLLDPE/EVA共混物在降温过程中发生的相转变过程,虽然可以采用DSC测量其能量变化,但这一热分析手段不能提供变化的微观原因和细节;而降温过程对共混物的红外光谱吸收峰强度、峰形和吸收频率都有显著影响。引起这一变化的原更多还原

【Abstract】 Thermal spectra of mLLDPE/EVA blends were collected at 150℃-67℃ by FTIR micro-spectroscopy. Conformational apparent enthalpy differences AH in the crystallization process have been calculated by van’t Hoff equation at constant pressure and plotted with temperature. Compared with DSC analysis. two exothermal peaks were examined during the crystallization process, corresponding to mLLDPE and EVA centralized regions respectively. In comparison with the values of apparent enthalpy AH, it can be seen that the bending vibration of methylene groups make prominent contribution to the regular arrangement of chain segments in the crystallizing process.更多还原