新型改性聚酯的制备及其性能

Preparation and properties of novel modified polyester

为研究新型多功能黏土类材料(QE粉)改性聚酯(PET)的可纺性及加工性能,采用共混法制备PET/QE共混物,并借助毛细管流变仪、热重分析仪、扫描电子显微镜对共混物的流变性能、热性能及其纤维形貌进行测试与表征。结果表明:QE粉的添加使PET发生降解,大幅减小了共混熔体的流动阻力和非牛顿性,添加质量分数为1%的QE粉的共混物在剪切速率为900 s-1时,剪切黏度和剪切应力较纯PET分别下降了253%和295%,非牛顿指数升高了19.4%;QE粉对PET的热降解性能基本无影响,其质量分数为2%时,共混物的起始热分解温度下降3℃;采用皮芯纺丝法制备的改性纤维表面含大量QE粉颗粒,且纤维表面部分区域存有凹痕。

In order to study the spinnability and processing performance of polyethylene terephthalate（ PET） modified with novel multifunctional clay material（ QE powder）,PET/QE blends were prepared by blending modification. Rheology and thermal properties as well as its fiber morphology of the blends were characterized by capillary rheometer,thermo-gravimetric analysis and scanning electron microscope,respectively. The results indicate that the addition of QE powder degrades PET,and dramatically weakens the flow resistance and non-Newtonian behavior of the blends melt. With the shear rate of 900 s-1 considered,the blend with 1% QE powder shows 253% and 295% decrease on shear viscosity and shear stress values,respectively when compared with pure PET,and non-Newtonian index increases by 19. 4%. The thermal degradation test and TG analysis show that QE powder has little effect on the thermal degradation property of PET,and only the initial thermal decomposition temperature of PET decreases by 3 ℃ when QE powder mass fraction is added to 2%. Moreover,core spinning method was used to prepare the modified fiber,the surface of which contains a large amount of QE powder,and dents exist on the partial region of the fiber surface.