芳香族共聚酯的固相聚合和熔融纺丝

摘要

为制备高强高模芳香族共聚酯纤维,本文研究了低分子质量芳香族共聚酯的固相聚合,分析了固相聚合前后芳香族共聚酯的流变性能,并进行了熔融纺丝实验.结果表明,通过固相聚合可以大大提高芳香族共聚酯的分子质量,其熔体为非牛顿流体,呈现明显的切力变稀行为,且随着温度的升高,表观黏度下降,非牛顿指数变大.固相聚合后初生纤维的力学性能较固相聚合前有大幅度的提高.SEM照片显示,芳香族共聚酯纤维由约5μm的大原纤和约1 μm的原纤构成.%Solid-phase polymerization ( SPP) of aromatic copolyester with low molecular weight was studied to prepare aromatic copolyester fiber with high strength and high modulus. The rheological properties of aromatic copolyester before and after SPP were analyzed. And the melt-spinning experiments of aromatic copolyester were performed. It is shown that SPP can increase the molecular weight greatly. Rheological analysis showed that the aromatic copolyester melt was a typical non-Newtonian fluid that exhibited shear thinning behavior. The apparent viscosity decreased and non-Newtonian index increased with the increasing of the temperature. The as-spun fiber with sample after SPP had higher strength than that before SPP. SEM images showed that the aromatic copolyester fiber is composed of macrofibril of 5μ and fibril of 1μm.