Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/38770

TitleEffect of butadiene/styrene ratio, block structure and carbon nanotube content on the mechanical and electrical properties of thermoplastic elastomers after UV ageing
Author(s)Costa, P.
Ribeiro, S.
Botelho, Gabriela
Machado, A. V.
Lanceros-Méndez, S.
KeywordsPolymer photodegradation
TPE
CNT composites
Polymer chain scission
Cytotoxicity
Issue date2015
PublisherElsevier
JournalPolymer Testing
CitationCosta, 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
Abstract(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.
TypeArticle
URIhttp://hdl.handle.net/1822/38770
DOI10.1016/j.polymertesting.2015.02.002
ISSN0142-9418
1873-2348
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)
CDQuim - Artigos (Papers)
IPC - Artigos em revistas científicas internacionais com arbitragem

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