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Title: Non-isothermal decomposition kinetics of azodicarbonamide in high density polyethylene using a capillary rheometer
Author: Robledo-Ortiz, J.R.
Zepeda, C.
Gomez, C.
Rodrigue, D.
Gonzalez-Nunez, R.
Issue Date: 2008
Abstract: In this work, a capillary rheometer coupled with a closed die was used to study the non-isothermal decomposition kinetics of azodicarbonamide (ACA) in high density polyethylene (HDPE). Samples having 0.5% ACA were studied with or without the addition of 0.1% zinc oxide (ZnO) as an activator. Using different temperature settings, the pressure related to polymer swelling and blowing gas evolution was followed as a function of time until equilibrium was reached. Via some calibrations and corrections, an extent of reaction method was combined with general nth-order reaction kinetics and the autocatalytic theory to obtain some kinetic parameters. The results show that this simple method can give good representation of the decomposition process. © 2008 Elsevier Ltd. All rights reserved.
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