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https://hdl.handle.net/1822/38770
Título: | Effect of butadiene/styrene ratio, block structure and carbon nanotube content on the mechanical and electrical properties of thermoplastic elastomers after UV ageing |
Autor(es): | Costa, P. Ribeiro, S. Botelho, Gabriela Machado, A. V. Lanceros-Méndez, S. |
Palavras-chave: | Polymer photodegradation TPE CNT composites Polymer chain scission Cytotoxicity |
Data: | 2015 |
Editora: | Elsevier |
Revista: | Polymer Testing |
Citação: | Costa, P., Ribeiro, S., Botelho, G., Machado, A. V., & Lanceros Mendez, S. (2015). Effect of butadiene/styrene ratio, block structure and carbon nanotube content on the mechanical and electrical properties of thermoplastic elastomers after UV ageing. Polymer Testing, 42, 225-233. doi: 10.1016/j.polymertesting.2015.02.002 |
Resumo(s): | Thermoplastic elastomers based on a triblock copolymer styrene-butadiene-styrene (SBS) with different butadiene/styrene ratios, block structure and carbon nanotube (CNT) content were submitted to accelerated weathering in a Xenontest set up, in order to evaluate their stability to UV ageing. It was concluded that ageing mainly depends on butadiene/styrene ratio and block structure, with radial block structures exhibiting a faster ageing than linear block structures. Moreover, the presence of carbon nanotubes in the SBS copolymer slows down the ageing of the copolymer. The evaluation of the influence of ageing on the mechanical and electrical properties demonstrates that the mechanical degradation is higher for the C401 sample, which is the SBS sample with the largest butadiene content and a radial block structure. On the other hand, a copolymer derivate from SBS, the styrene-ethylene/butadiene-styrene (SEBS) sample, retains a maximum deformation of ~1000% after 80 h of accelerated ageing. The hydrophobicity of the samples decreases with increasing ageing time, the effect being larger for the samples with higher butadiene content. It is also verified that cytotoxicity increases with increasing UV ageing with the exception of SEBS, which remains not cytotoxic up to 80 h of accelerated ageing time, demonstrating its potential for applications involving exposition to environmental conditions. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/38770 |
DOI: | 10.1016/j.polymertesting.2015.02.002 |
ISSN: | 0142-9418 1873-2348 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) CDQuim - Artigos (Papers) IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Costa_2015.pdf Acesso restrito! | 941,31 kB | Adobe PDF | Ver/Abrir |