Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


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THE THERMO-OXIDATION OF POLY(ISOBUTYLENE) AND ITS COPOLYMERS WITH ISOPRENE IN TERMS OF ACTIVATION ENERGIES AND REACTION MECHANISMS

1 pazur r p14668 1

Event: 187th Technical Meeting
Location: Greenville, SC
Date: April 27, 2015
Author: Pazur, R.
Paper Number:

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  • This presentation will review our recent work in understanding the thermo-oxidative behaviour of both poly(isobutylene) and its copolymers containing up to 1.85 mol% isoprene. Transmission Fourier Transform Infrared (FTIR) spectroscopy was the method of choice to follow oxidative group development upon heat aging. Proton Nuclear Magnetic Resonance (NMR) aided to identify the stable oxidative products. Oxidation product evolution displayed linear Arrhenius behaviour in the case of the homopolymer from 40 to 100°C. In contrast, non-Arrhenius kinetics were operating in the copolymers with curvature seen in the results at 70°C. Test results were interpreted in terms of two competing thermo-oxidative zones, isobutylene and isoprene, the latter operating at low temperatures as shown by isoprene depletion and subsequent chain scission reactions. A set of thermo-oxidative reactions for the copolymers at low temperatures have been proposed comprising allylic and addition reactions at the isoprene unit.
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