シバタ　ミツヒロ   SHIBATA MITSUHIRO   柴田　充弘    所属   千葉工業大学  工学部 応用化学科    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 応用化学専攻    職種   教授
言語種別	英語
発行・発表の年月	2014/10
形態種別	学術雑誌
査読	査読あり
標題	Semi-interpenetrating polymer networks composed of poly(L-lactide) and diisocyanate-bridged 4-arm star-shaped epsilon-caprolactone oligomers
執筆形態	共著
掲載誌名	Polymer
掲載区分	国外
出版社・発行元	Elsevier
巻・号・頁	21(9),pp.5407-5416
著者・共著者	Ayaka Shibita, Hayato Takase, Mitsuhiro Shibata
概要	Semi-IPNs were prepared by reactions of methylenediphenyl 4,4'-diisocyanate (MDI) and hydroxy-terminated 4-arm star-shaped caprolactone oligomers (H4CLOn's) with the degrees of polymerization per one arm, n = 3, 5 and 10 in the presence of poly(L-lactide) (PLA). Morphologies, thermal and mechanical properties of the MDI-bridged H4CLOn (MH4CLOn)/PLA semi-IPNs were evaluated by comparing with those of polycaprolactone (PCL)/PLA blends.Two tan delta peaks related to MH4CLOn and PLA were observed in a dynamic mechanical curve of the semi-IPN. Although all the semi-IPNs and blends had micro-phase separated morphologies, the phase-separated droplets of MH4CLO5/PLA 50/50 were much finer than those of PCL/PLA 50/50. DSC analyses revealed that MH4CLO3 and MH4CLO5 are substantially amorphous, while MH4CLO10 is semi-crystalline. Tensile modulus, toughness and elongation at break of MH4CLO5/PLA 50/50 semi-IPN were much higher than those of PCL/PLA 50/50 blend.
DOI	10.1016/j.polymer.2014.08.074
ISSN	0032-3861