在70℃条件下,对低密度聚乙烯(LDPE)/聚烯烃弹性体(POE)共混物进行八周热空气老化试验,通过差示扫描量热法(DSC)和宽角X射线衍射(WAXD)表征了共混物结晶行为的变化,研究了熟空气老化对共混物力学性能的影响.ω(POE)为30%的共混物具有优异的耐热氧老化性能,在老化前期,其断裂伸长率有所增加,在老化后期才略有下降,而拉伸强度则基本不变.热空气老化对共混物结晶行为产生明显的影响,且结晶行为的变化主要在老化前期完成.经过热空气老化,部分在制备过程中形成的不完善晶体重新结晶,晶粒尺寸逐渐变大,提高了LDPE结晶的完善性.
The effect of thermal aging on the properties of low density polyethylene(LDPE)/polyolefin elastomer (POE) blends was studied in air oven at 70 ℃ for 8 weeks. Influence of thermal aging on blend crystallization behavior was characterized by differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). Withal the effect of thermal aging on the mechanical properties was also investigated. The blend with ω (POE) of 30% had excellent thermal aging resistance, its elongation at break increased at the early stage and decreased slightly in the late period; however its tensile strength kept almost changeless. The thermal aging had remarkable influences on the crystallization of the blends in the early stage. During the thermal aging, imperfect crystallization which formed during the preparation of LDPE/POE blends re-crystallized resulting in bigger crystals. As a result, the homogeneity of LDPE crystallization became better.
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