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General and more precise relationships between molecular weight, blend ratio, and melt index of binary polyethylene blends
Author(s) -
Ghasemi S. M.,
Sadeghi G. Mir Mohamad
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27788
Subject(s) - melt flow index , polymer blend , materials science , polyethylene , arrhenius equation , wax , polymer , thermodynamics , molar mass distribution , polymer chemistry , binary number , work (physics) , chemical engineering , polymer science , composite material , chemistry , copolymer , mathematics , activation energy , physics , arithmetic , engineering
Simpler, cheaper, and fast methods to characterize material properties are important in industrial plants. One of these properties is molecular weight which is measured generally by size exclusion chromatography, an expensive method and also limited for polyolefins which have few solvents. Melt flow index (MFI) measurement is simple, cheap, and rapid that could be a considerable method to estimate $ \bar Mw $ of polymers. In this work, mathematical correlation between MI* (a new defined MFI), first melt dropping of blend ( t 1 ), weight fraction ( w i ) and $ \bar Mw $ in binary polyethylene blends, PE/PE wax, has been investigated by using a new device. Results show that relationships MI* and t 1 with w i of the blended materials follow a modified Arrhenius equation (Wong equation) and also new non‐Arrhenius equations for prediction of MI of blends have been investigated. We proposed a modified molecular weight ( $ \bar Mm $ ) for Bremner and Rudin's equation (Bremner et al., J Appl Polym Sci 1990, 41, 1617), which is used in 1/MI* and t 1 correlations with molecular weight of polymer. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008