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Using Crystallisation Fractionation to Monitor Thermo-Oxidative Degradation of Impact Poly(propylene) Copolymers

✍ Scribed by Elana de Goede; Peter E. Mallon; Harald Pasch

Book ID
102942180
Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
905 KB
Volume
297
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

ICPPs are complex materials that contain various ethylene/propylene copolymers in addition to the majority poly(propylene) phase. To understand their molecular structure, multiple fractionation and analysis techniques are used. In this study, TREF and CRYSTAF are used to study the difference in the thermo‐oxidative degradation of two grades of ICPPs with different ethylene contents. Direct correlations are drawn between the carbonyl index, molecular weight and crystallisability at various stages of degradation. The higher ethylene content sample shows increased thermal stability. This is due to the fact that the ethylene/propylene fraction is more stable due to the higher comonomer content and lower isotacticity as well as due to the higher amount of this fraction in the material.

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Spatial Heterogeneity of Thermo-Oxidativ
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✍ Elana de Goede; Peter E. Mallon; Karsten Rode; Harald Pasch 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 443 KB

## Abstract The spatial degradation in impact PP copolymers with different ethylene contents is studied by FTIR microscopy and layer‐by‐layer milling of the sample surfaces, followed by ATR‐FTIR, SEC, and CRYSTAF analysis. FTIR allows for tracking of the rate of degradation, providing information o