Non-isothermal decomposition kinetics of azodicarbonamide in high density polyethylene using a capillary rheometer
2008; Elsevier BV; Volume: 27; Issue: 6 Linguagem: Inglês
10.1016/j.polymertesting.2008.05.004
ISSN1873-2348
AutoresJorge R. Robledo‐Ortíz, Carlos A. Flores Zepeda, César Gómez, Denis Rodrigue, Rubén González‐Núñez,
Tópico(s)Rheology and Fluid Dynamics Studies
ResumoIn 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.
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