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Mechanical Degradation of Polypropylene Solutions Under Large Pressure Drops by Raquel E. Martini; Esteban A. Brignole; Silvia E. Barbosa is a Materials Science article available to read on EtoBox.

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## Abstract The degradation of polypropylene (PP), dissolved in __n__‐alkanes at high temperatures and pressures, during the solution discharge to ambient conditions was experimentally studied. Molecular weight distributions (MWD) of the solubilized PP were measured by gel permeation chromatography. The MWD curves of PP obtained after discharge of the polymer solution shift to the low molecular weight side of the distribution and the polydispersity is reduced. In this work, a systematic study on the discharge products was performed to elucidate the degradation mechanism and the effects of temperature and concentration on this phenomenon. Initially, pure polymers, PP and polystyrene (PS) were studied varying the solution temperature. In a second stage, the effect of polymer concentration on chain scission was assessed using experiments on physical blends of PP/PS. In all cases, thermal and oxidative degradation were previously analyzed. Mechanical degradation was found to be the main chain scission mechanism. A negative linear functionality of the chain scission was found in both temperature and polymer concentration. To analyze the relationship between polymer degradation and molec

Who reads Mechanical Degradation of Polypropylene Solutions Under Large Pressure Drops?

Author

Raquel E. Martini; Esteban A. Brignole; Silvia E. Barbosa

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)