低密度聚乙烯的流变性能研究  

Research on Rheological Properties of Low Density Polyethylene

作　　者：马丽[1] 杨国兴[1] 王文燕[1] Ma Li;Yang Guoxing;Wang Wenyan(Daqing Chemical Research Center,Petrochemical Research Institute,CNPC,Daqing,Heilongjiang,163714)

机构地区：[1]中国石油天然气股份有限公司石油化工研究院大庆化工研究中心,黑龙江大庆163714

出　　处：《现代塑料加工应用》2022年第2期35-38,共4页Modern Plastics Processing and Applications

摘　　要：通过旋转流变仪测试了3种低密度聚乙烯(LDPE-1,LDPE-2,LDPE-3)的流变性能。结果表明:LDPE-2和LDPE-3的储能模量和损耗模量变化趋势均几乎重合,在低剪切速率区域,LDPE-1的储能和损耗模量最高,流动性较差,但黏度下降幅度大,剪切速率较高时,3个样品的流动性接近;LDPE-1的相对分子质量与分布大于LDPE-2和LDPE-3,在外力作用下,LDPE-2和LDPE-3的松弛程度比LDPE-1大,3个样品的柔量均先增大后趋于平稳。The rheological properties of three kinds of low density polyethylene(LDPE-1,LDPE-2and LDPE-3)were tested by rotational rheometer.The results show that the change trends of the storage modulus and loss modulus of LDPE-2and LDPE-3 are almost coincident,and the storage modulus and loss modulus of LDPE-1are the highest in the region of low shear rate.The fluidity is the worst,but the viscosity drops greatly.When the shear rate is high,the fluidity of three samples is close.Relative molecular weight and its distribution of LDPE-1are greater than those of LDPE-2and LDPE-3.Under the action of external force,the degree of relaxation of LDPE-2and LDPE-3is greater than that of LDPE-1.The compliance of three samples first increases and then tends to be stable.

关 键 词：旋转流变 低密度聚乙烯 蠕变 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]