Effect of Radiation on Oil Extended Styrene-Butadiene Block Copolymer

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题名:	Effect of Radiation on Oil Extended Styrene-Butadiene Block Copolymer
作者:	蔡秉宏、徐武軍 Ping-Hung Tsai and Geoffrey Hsu
贡献者:	東海大學工學院
关键词:	radiation vulcanization, UV radiation, and radiation crosslinking of SBS
日期:	2001-07
上传时间:	2013-03-26T09:01:04Z (UTC)
出版者:	台中市：東海大學
摘要:	Oil extended SBS containing various levels of photoinitiators, and crosslink agents were subjected to different UV and gamma irradiation dosages in nitrogen atmosphere; gel content, molecular weight(MW) and molecular weight distribution(MWD) excluding gel, tensile strength, modulus and elongation, Tg, and initial thermal degradation temperature were then measured. Crosslink density, expressed as gel content, was found proportional to radiation time but could not be correlated to physical strength changes; crosslink agent enhances gel formation but not the physical strength; MW excluding gel, dispersed wider after irradiation indicating both crosslink and scission occurred. Samples with 5 phr photoinitiator irradiated with 600 W UV lamp for 2 minutes at a distance of 30 cm, yield the best mechanical properties, while tensile strength at break and elongation increased 47.04% and 32.85%, respectively, and initial thermal degradation temperature and Tg increased 30.51℃ and 10.46℃, respectively. The addition of low molecular weight chemicals, such as extended oil, photoinitiator or crosslink agents, dilutes physical strength. Linear SBS requires less radiation dosage to reach the highest physical strength than the branched SBS. Tensile strength and elongation irradiated with gamma ray decreased with increased dosage, but TS300% and Tg increased. Physical strength of SBS is dominated by the hard block, radiation do not carry it beyond samples without extend oil.
關聯:	東海大學東海學報第42卷, p.13-22
显示于类别:	[工學院] 東海學報

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