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中文摘要：
用示差扫描量热仪（DSC）和广角X射线衍射仪（WAXD）研究了溶液共混法和熔融共混法制备的等规聚丙烯/二元乙丙橡胶（iPP/EPR）（85∶15,W/W）合金的晶相结构.发现溶液共混法制得的iPP/EPR合金晶相中仅存在α-iPP,而熔融共混样品中则同时生成了α-iPP和β-iPP.这一结果表明,EPR并不是iPP/EPR合金中β-iPP生成的关键因素.考察了结晶温度和熔体热处理对iPP/EPR合金晶相结构的影响,发现通常的热处理并不能消除合金中β-iPP的生成.
英文摘要：
The crystalline structure of isotactic polypropylene/ethylene-propylene rubber （ iPP/EPR,85： 15, W/ W） blends prepared by melt-blending and solution-blending methods, respectively was studied by using modulated differential scanning calorimetry （MDSC） and wide angle X-ray diffraction （WAXD）. The experimental results reveal that α-iPP and β-iPP coexist in the PP85m sample prepared by melt-blending method, but only α-iPP appeared in the PP85s sample prepared by solution-blending method, and its crystalline structure is independent on isothermal crystallization temperature. The β-iPP content in PP85m is dependent on the crystallization temperature and approaches to a maximum at about 125℃. In addition, it is found that the iPP/EPR samples experienced annealing at 200℃ for different times （5 - 30 min） demonstrate the same melting behavior, indicating that the annealing treatment for different times at 200℃ has little effect on the formation of β-iPP in PP85m samples. It is suggested that the formation of β-iPP in PP/EPR blends is dependent on its thermomechanical history.
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