从聚丙烯流动曲线估算分子量分布  

DETERMINING MOLECULAR WEIGHT DISTRIBUTION INDEX FROM FLOW CURVES FOR POLYPROPYLENE

作　　者：柯林萍[1] 过梅丽[1] 赵得禄[2] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]中国科学院化学研究所分子科学中心高分子物理与化学国家重点实验室,北京100080

出　　处：《高分子学报》2004年第3期442-445,共4页Acta Polymerica Sinica

基　　金：国家重点基础研究专项经费资助项目(项目号G1999064808);863项目"聚合物加工的科学技术和软件化"资助项目(项目号2001AA336120)

摘　　要：A method determining molecular weight distribution index D (MWD) from viscosity versus shear stress flow curves for polypropylene has been presented.Based on the experimental data,the correlation between the viscosity η of molten polypropylene and its MWD can be expressed as η/η-0=｛1+a(τD)+m｝+{-1},where η-0 is the zero shear viscosity, τ is the shear stress, a and m are empirical parameters.Furthermore,a simpler method to estimate the MWD from only two experimental data,i.e.the melt index (MI) and the zero shear viscosity has also been presented,the calculated results are in good agreement with the data from GPC measurements.A method determining molecular weight distribution index D ( MWD ) from viscosity versus shear stress flow curves for polypropylene has been presented. Based on the experimental data, the correlation between the viscosity eta of molten polypropylene and its MWD can be expressed as eta/eta(0) = {1 + a ( tauD )(m)}(-1), where eta(0) is the zero shear viscosity, tau is the shear stress, a and m are empirical parameters. Furthermore, a simpler method to estimate the MWD from only two experimental data, i. e. the melt index ( MI ) and the zero shear viscosity has also been presented,the calculated results are in good agreement with the data from GPC measurements.

关 键 词：聚丙烯 流动曲线 估算 分子量分布指数 

分 类 号：O631[理学—高分子化学]