Thermal Stability Improvement and Structural Change of Oil Gels Formed by Styrene-Butadiene-Styrene Triblock Copolymer Induced by Adding Poly(phenylene ether)

Autor:	Yuki Tsukamoto, Kouichi Kato, Shigeru Tasaka, Eri Hirai, Yasuhiro Matsuda
Rok vydání:	2014
Předmět:	Solvent chemistry.chemical_compound Materials science chemistry Softening point Phenylene Polymer chemistry Copolymer Thermal stability Polystyrene Glass transition Styrene
Zdroj:	Open Journal of Organic Polymer Materials. :65-73
ISSN:	2164-5752 2164-5736
DOI:	10.4236/ojopm.2014.44009
Popis:	The thermal stability of oil gels formed by styrene-butadiene-styrene triblock copolymer (SBS) was improved by adding a small amount of poly(phenylene ether) (PPE), which has a higher glass transition temperature (Tg). In naphthenic oil which is a good solvent for the butadiene blocks, but a non-solvent for the styrene blocks and PPE, PPE was selectively included into styrene blocks in SBS, and induced the increase of the Tg of these blocks. The melting temperature determined by viscoelastic measurements and softening temperature of the gels were elevated by adding PPE, while no significant change was detected by adding polystyrene. The gel became opaque by adding PPE, and partially separated phases were observed by field emission scanning electron microscopy (FE-SEM). The dependence of the viscoelastic behavior on the PPE concentration can be explained by the structural change observed by FE-SEM.
Databáze:	OpenAIRE
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