Peroxide Induced Degradation of Polypropylene: Influence of Molecular Structure on the Rheological Properties

Berzin, Françoise; Vergnes, Bruno; Dufosse, P.; Delamare, L.

doi:10.1007/978-3-642-51062-5_180

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“…Until now, studies involving peroxide‐induced modifications have been focused on the behavior of PP homopolymers4–7 and on mechanical blends of PP and PE 8–12. Only recently have a few studies appeared on the behavior of PP/PE copolymers 13, 14. For the PP homopolymer, the main mechanism involved in the presence of free radicals is β‐scission, that is, the rupture of the main chain by hydrogen abstraction.…”

Section: Introductionmentioning

confidence: 99%

Rheological behavior of controlled‐rheology polypropylenes obtained by peroxide‐promoted degradation during extrusion: Comparison between homopolymer and copolymer

Berzin

Vergnes

Delamare³

2001

J of Applied Polymer Sci

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108

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International audienceIn the present work, experimental studies of the free-radical-initiated molecular weight degradation of polypropylene in a modular self-wiping corotating twin-screw extruder are investigated. The control of the molecular weight distribution of polypropylene resins by peroxide degradation is widely used in the polymer industry. It allows one to adjust the viscosity of these resins to the level required for processing applications. The purpose of this work was to characterize the influence of peroxide degradation on the rheological behavior of a polypropylene homopolymer and a block polypropylene/polyethylene copolymer, which includes an addition of a low percentage of polyethylene (around 7%). The homopolymer exhibits a classical behavior: When the peroxide amount is increased, we observe a decrease in the viscosity corresponding to a decreasing molecular weight and a pronounced shift toward more Newtonian behavior. The rheological behavior of the copolymer is influenced by the presence of the polyethylene phase which greatly modifies the viscoelastic properties and increases the viscosity when the polypropylene matrix is highly degraded

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