To determine the factors influencing the retardation of the crystallization of poly(trimethylene terephthalate) (PTT) when PTT is blended with polycarbonate (PC), different PTT/PC blends were prepared via the melt mixing method. The relationships between the crystallization behavior and blend composition, as well as the phase morphology, were investigated. The results showed that the predominant reason for the retardation in crystallization is due to the PC content and phase morphology. The PC influences the crystallization of PTT via two methods. First, it retards PTT crystallization. Secondly, the PC exhibits a nucleation effect on the PTT crystallization which is, however, much weaker compared to the negative effect PC exerts with regards to PTT crystallization. When the processing temperature and shear rate remains unchanged, the two effects of PC determine the crystallization behavior of the blend. The phase morphology, which is strongly dependent on the mixing temperature and the shear rate, and which is also related to mixing time, had an appreciable impact on PTT crystallization. In the case of similar adhesion with the interface, a finer PC phase domain would show a slightly stronger nucleation effect on PTT crystallization.

为了确定当将PTT与聚碳酸酯（PC）共混时影响聚对苯二甲酸丙二醇酯（PTT）结晶延迟的因素，通过熔融混合法制备了不同的PTT / PC共混物。研究了结晶行为与共混物组成以及相形态之间的关系。结果表明，结晶延迟的主要原因是由于PC含量和相形态。PC通过两种方法影响PTT的结晶。首先，它会延迟PTT结晶。其次，PC对PTT结晶具有成核作用，然而，与PC对PTT结晶产生的负面作用相比，PC的成核作用要弱得多。当加工温度和剪切速率保持不变时，PC的两种作用决定了共混物的结晶行为。相形态在很大程度上取决于混合温度和剪切速率，并且还与混合时间有关，这对PTT结晶具有明显的影响。在与界面的粘附力相似的情况下，较细的PC相域将在PTT结晶上显示出稍强的成核作用。