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- W2108357811 abstract "Our main objective of this study was to study the parameters affecting the free-radical melt grafting of maleic anhydride (MA) onto linear low-density polyethylene (LLDPE) with dicumyl peroxide (DCP) in an internal mixer. The degree of grafting (DG) was measured with titrometry and Fourier transform infrared spectroscopy. The extent of chain-branching/crosslinking was evaluated with gel content and melt flow index measurements. The flow behavior and melt viscoelastic properties of the grafted samples were measured by using rheometric mechanical spectrometry. Feeding order, DCP and MA concentration, reaction temperature, rotor speed, and grade of LLDPE were among parameters studied. The results show that the reactant concentration (MA and DCP) played a major role in the determination of the grafting yield and the extent of the chain-branching/crosslinking as competitive side reactions. The order of feeding also had an appreciable effect on the DG and the side reactions. Increasing the rotor speed increased the grafting yield and reduced side reactions by means of intensification of the mixing of reactants into the polyethylene (PE) melt. Chain-branching dominated the side reactions for lower molecular weight PE, whereas for higher molecular weight PE, chain-branching led to crosslinking and gel formation. The results of the melt viscoelastic measurements on the grafted samples provided great insight into the understanding of the role of influential parameters on the extent of side reactions and resulting changes in the molecular structure of the grafted samples. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 141–149, 2006" @default.
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- W2108357811 date "2005-01-01" @default.
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- W2108357811 title "Parameters affecting the free-radical melt grafting of maleic anhydride onto linear low-density polyethylene in an internal mixer" @default.
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- W2108357811 doi "https://doi.org/10.1002/app.21870" @default.
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