Comparative Assessment of Stabilised Polybutadiene Binder under Accelerated Ageing

Authors

  • Luiz Felipe Cannaval Sbegue Escola de Engenharia de Lorena - Universidade de São Paulo
  • Luciene Dias Villar Instituto de Aeronáutica e Espaço, São José dos Campos/SP, Brazil http://orcid.org/0000-0001-9455-5581

Keywords:

Ageing, Antioxidant, HTPB propellants, Stabilisers

Abstract

Polybutadiene elastomers are versitile materials, being employed at several applications from rocket propellant binder to adhesives and selants. The elastomers derived from hydroxyl-terminated polybutadiene (HTPB) are usually stabilised with antioxidants to prevent degradation. In this study, a comparative assessment among 2,2'-methylene-bis(4-methyl-6-tert-butylphenol) (AO2246), 2,6-di-tert-butyl-4-methylphenol (BHT), p-phenylenediamina (p-PDA), and triphenylphosphine (TPP) regarding stabilisation of HTPB binder under acceletated ageing (six months at 65oC) was carried out. Evaluation of antioxidants effectiveness was examined through Oxidation Induction time (OIt), sol/gel extraction, swelling and mechanical testing, dynamic mechanical analysis (DMA), and mass variation measurement. AO2246 yielded the best performance, meanwhile BHT was poorly protective. TPP acted as prooxidant and caused a severe degradation of the binder. p-PDA was not manageable to be assessed due to the lower curing degree of the resulted polyurethane.

Author Biographies

Luiz Felipe Cannaval Sbegue, Escola de Engenharia de Lorena - Universidade de São Paulo

Luiz Felipe Cannaval Sbegue is an undergraduate student of Materials Engineering at São Paulo University, Brazil. He was granted a scholarship by CNPq (National Council on Research) for undergraduate students as part of governmental programme for scientific initiation at research. His major interest is related to structure-property relationship in polymer composites.

Luciene Dias Villar, Instituto de Aeronáutica e Espaço, São José dos Campos/SP, Brazil

Luciene Dias Villar has received her BSc degree in Chemical Engineering from São Paulo University, Brazil. Her postgraduate studies were completed by a MSc degree in Clean Technology from University of Newcastle upon Tyne, United Kingdom, and a PhD degree in Biotechnology from State University of São Paulo, Brazil. Nowadays, she is a senior researcher at Institute of Aeronautics and Space (IAE), being also a lecturer of postgraduate course of Aeroespace Science and Technology at Aeronautics Institute of Technology (ITA). Her main interests are in the areas of degradation and ageing of polymer compounds applied to solid propulsion, and in treatment of solid residues.

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Published

2016-05-31

Issue

Vol. 8 No. 2 (2016): Apr./Jun. 2016

Section

Original Papers

License

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