阻燃共聚酯纳米复合材料的流变性能

摘要

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.%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/ BaSO4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% BaSO4和 PET/10% DDP/5% BaSO4）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%BaSO4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% BaSO4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。