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.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
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)
