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- W2474834049 abstract "A linear multivariable power function P = f (M, MWD, LCB), representing the dependence of a polymer property P on the polymer molecular characteristics, where M is the molecular weight, MWD - the molecular weight distribution, and LCB - the long chain branching, has recently been applied for investigation of polymer melts, cf. Dobkowski (1982, 1988, 1994, 1998). If the polymer fluidity difference between the Newtonian and non-Newtonian conditions is taken as the polymer property, then the master line can be obtained for polymer melts in reduced log-log coordinates. Thus, the multivariable power function (MVP) for the dependence of η0 and Δϕ on M, MWD and LCB can be written as log $$begin{array}{*{20}c} {log (Delta varphi .eta _0 ) = log B + } { + log [(eta _0 .omega )^{b_1 } .q^{b2} .G^{b_3 } ]} end{array}$$ (1) where η0 is the zero shear rate melt viscosity, ω is the frequency, Δϕ is the fluidity difference between the Newtonian and non-Newtonian conditions where, in turn, ϕ = 1/η is the fluidity and Δϕ = 1/η - 1/η0 . It should be noted that the frequency can be replaced by the shear rate according to the Cox-Merz rule, cf. Cox and Merz (1958), Dobkowski (1998). The exponents b1, b2 and b3 can be found from respective regression equations using the experimental data from rheological measurements. In particular, the exponent b1 of the MVP function enables distinguishing linear and branched polymer structures, cf Dobkowski (1982).KeywordsShear RateMolecular Weight DistributionRheological MeasurementTemperature FunctionPolymer PropertyThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
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- W2474834049 date "1998-01-01" @default.
- W2474834049 modified "2023-09-23" @default.
- W2474834049 title "On Search for a Generalized Constant of Polymer Melts" @default.
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- W2474834049 doi "https://doi.org/10.1007/978-3-642-51062-5_122" @default.
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