Thermal stability of additivated isotactic polypropylene |
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| Authors: | Traian Zaharescu Silviu Jipa Radu Setnescu Célia Santos Bárbara Gigante Ion Mihalcea Cornel Podină Laura-Monica Gorghiu |
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| Affiliation: | 1.R & D Institute for Electrical Engineering, Advance Research Center, 313 Splaiul Unirii, Bucharest 74204, Romania. e-mail: traian@gw-chimie.math.unibuc.ro, fax: 0040-1 -346-7283,RO;2.INETI, DTIQ, Estrada do Pa?o do Lumiar, 1649-038, Lisbon, Portugal,PT;3.Faculty of Chemistry, University of Bucharest, 13 Elisabeta Av., Bucharest 70346, Romania,RO;4.Faculty of Science, University VALACHIA Targoviste, 2 Carol Av. 0200, Romania,RO |
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| Abstract: | Summary Isotactic polypropylene stabilised with fullerene [C60], its adduct with methyl levopimarate, carbon black, p-t-butylcalix[4]arene, p-t-butylcalix[6]arene, Irganox 1076 or Topanol OC was investigated by means of oxygen uptake method under isothermal (165°C) and isobaric (normal pressure) conditions. Oxidation investigations were performed in air as degradation environment. Additive concentration was 0.25 % (w/w). Kinetic parameters, oxidation induction and oxidation rate are compared with similar characteristics of additive-free i-PP. Effect of γ-irradiation on thermal oxidation is also presented. Three γ-exposure doses (50, 100 and 150 kGy) were selected. The influence of radiation treatment on the efficiency of studied compounds and some mechanistic aspects are also presented. Received: 5 June 2002/Revised version: 10 August 2002/ Accepted: 12 September 2002 Correspondence to Traian Zaharescu |
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