阻燃共聚酯纳米复合材料的流变性能

Rheological Properties of Flame-Retardant Copolyester Nanocomposites

本文以对苯二甲酸(PTA)、乙二醇(EG)、9,10-二氢-9-氧杂-10-磷酰杂菲-丁二酸(DDP)和纳米硫酸钡乙二醇溶胶为单体,通过原位聚合的方式制备阻燃共聚酯/Ba SO4纳米复合材料,采用毛细管流变仪对聚酯(PET)、阻燃共聚酯(PET/10%DDP)和阻燃共聚酯纳米复合材料(PET/10%DDP/3%Ba SO4和PET/10%DDP/5%Ba SO4)的流变性能进行了对比研究。结果表明:各样品的非牛顿指数均小于1,属于切力变稀流体,粘流活化能随剪切速率的增加而降低;相同温度下,PET/10%DDP/3%Ba SO4的流动性能明显优于其它样品,熔体的表观黏度随纳米粒子含量的增加而增大;在各样品中,PET/10%DDP的粘流活化能最高,当剪切速率升至3000s-1以上时,PET/10%DDP/3%Ba SO4与PET的粘流活化能几乎相当,表明相比于阻燃共聚酯,添加纳米材料后降低了对纺丝温控精度的要求。

Flame - retardant coplyester/ BaSO4 nanocomposites were prepared by in - situ melting polycondensation with terephthalic acid（ TPA ）, ethylene glycol （ EG ）, nano - BaSO4 colloid and 9,10 - dihydro - 10[ 2,3 - di （hydroxycarbonyl）propyl]10 - phosphaphenanthrene - 10 - oxide（DDP）. Rheological properties of PET/ 10% DDP/ 3%BaSO4 and PET/ 10% DDP/ 5% BaSO4 were studied and compared to PET and PET/ 10% DDP. The results showed that all samples were shear - thinning fluids,the non - Newton indexes were less than 1 and the viscous activation energies decreased with the increase of shear rate. At the same temperature,the flow performance of PET/ 10% DDP/ 3% BaSO4 was much better than other samples,but the apparent viscosity increased with the increasing of nanoparticles. PET/ 10% DDP had the highest viscous activation energy. PET/ 10% DDP/ 3% BaSO4 and PET had almost equal viscous activation energy when shear rate was more than 3000s - 1 . This result indicates that the adding of the nanoparticles reduces the control precision of the spinning temperature.