【摘要】 用DSC和WAXD方法考察了高密度聚乙烯和低密度聚乙烯共混体系(HDPE/LDPE)的结晶性能。结果表明,在共混物中HDPE含量大于50%时,共混物只出现HDPE的熔融峰,且熔融温度随HDPE含量减小而降低;LDPE含量大于50%时,DSC图上只出现熔点介于HDPE和LDPE之间的新熔融峰。DSC和WAXD法所测结晶度均偏离共混物的线性加和值,而晶胞参数则随共混物组成变化出现最小值,表明HDPE和LDPE可以形成共晶相容体系。Raman光谱测得介晶相αb值的膨胀,支持这一观点。更多还原

【Abstract】 The crystallization behaviour of HDPE/LDPE blend have been studied by using DSC and WAXD techniques.The formation of two types of cocrystallite in blend system depends on the composition of the blend.When the content of HDPE is more than 50%,a HDPE cocrystallite is formed as a result of the entering of LDPE crystallite into HDPE crystalline regions. When the content of LDPE is more than 50%, a LDPE cocrystallite is formed. The changes in T_c, T_m, degree of crystallinity, and parameters of unit cell, observed by DSC and WAXD, showed the presence of HDPE/LDPE cocrystallite. The expansion of interracial regions, was observed from the value of α_c, α₁, and α_b obtained by Raman spectra.更多还原