二氧化硅气凝胶改性聚酯的流变性能研究  

Study on rheological properties of silica aerogel modified polyester chips

作　　者：王路 李映 刘传生 Wang Lu;Li Ying;Liu Chuansheng(Research Institute of Sinopec Yizheng Chemical Fibre Co.,Ltd.,Yizheng Jiangsu 211900,China)

机构地区：[1]中国石化仪征化纤有限责任公司研究院,江苏仪征211900

出　　处：《合成技术及应用》2023年第2期32-38,共7页Synthetic Technology & Application

摘　　要：为研究二氧化硅气凝胶对聚酯流变性能的影响,采用旋转流变仪和毛细管流变仪分别测试了二氧化硅气凝胶含量为0.7%、1.8%、2.5%改性聚酯的流变性能,并与常规聚酯的流变性能进行比较分析。结果表明:在低剪切速率下,三种改性聚酯均具有剪切变稀特性;含量为0.7%的改性聚酯表观黏度低于常规聚酯;含量为1.8%和2.5%改性聚酯的表观黏度高于常规聚酯。在高剪切速率下,三种改性聚酯非牛顿指数均<1,为非牛顿流体;相较于常规聚酯,二氧化硅气凝胶的加入,使得改性聚酯的流动性能得到改善,聚酯熔体的非牛顿指数增大,结构黏度指数减小;在三种不同二氧化硅气凝胶含量的改性聚酯中,含量为2.5%的改性聚酯的非牛顿指数更大、黏流化能更低、结构黏度指数更小,可纺性最好。相较于常规聚酯,含量为2.5%的改性聚酯的聚合动力黏度稍高,纺丝温度偏低。In order to study the effect of silica aerogel on the rheological properties of polyester,the rheological properties of modified polyester with silica aerogel content of 0.7%,1.8%and 2.5%were tested by rotary rheometer and capillary rheometer,respectively.The rheological properties were compared with those of conventional polyester.The results showed that all the three modified polyesters had shear thinning properties at low shear rates.The apparent viscosity of modified polyester with 0.7%content was lower than that of conventional polyester.The apparent viscosity of modified polyesters containing 1.8%and 2.5%was higher than that of conventional polyesters.At high shear rate,the non Newtonian index of the three modified polyesters was less than 1,and they were non-Newtonian fluid.Compared with conventional polyester,the addition of silica aerogel could improve the flow property of polyester,increase the non-Newtonian index of polyester melt and decrease the structural viscosity index.Among the three kinds of modified polyester with different silica aerogel content,the modified polyester with 2.5%content had higher non-newtonian index,lower viscous fluidization energy,lower structural viscosity index and the best spinnability.Compared with conventional polyester,modified polyester with a content of 2.5%had slightly higher polymerization dynamic viscosity and lower spinning temperature.

关 键 词：聚对苯二甲酸乙二醇酯 二氧化硅气凝胶 改性聚酯 流变性能 

分 类 号：TQ322[化学工程—合成树脂塑料工业]