Structure-rheology relationships of long-chain branched polypropylene: Comparative analysis of acrylic and allylic coagent chemistry |
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Authors: | J Scott Parent Aidan Bodsworth Marianna Kontopoulou Drew Poche |
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Affiliation: | a Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada b The Dow Chemical Company, 171 River Road, Piscataway, NJ 08854, USA c The Dow Chemical Company, Freeport, TX 77541, USA |
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Abstract: | The relationship between product structure and melt-state rheological properties is established for series of branched PP derivatives prepared by the radical-mediated grafting of tri-functional coagents. Peroxide-initiated, solvent-free additions of linear PP to triallyl trimesate (TAM), trimethylolpropane triacrylate (TMPTA) and triallyl phosphate (TAP) at high temperature are shown to produce bimodal molecular weight and branching distributions. Low-frequency dynamic shear viscosities as well as extensional viscosities are shown to be highly responsive to a hyper-branched chain population, whose abundance and molecular weight correlate with the kinetic chain length of the grafting process, and the propensity of a coagent to oligomerize. |
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Keywords: | Polypropylene Long-chain branching Rheology |
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