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Poly(glycolide-co-$\varepsilon$-caprolactone) 공중합체의 합성 및 특성 분석
박남집,지민호,송승호,안상국,최교창,백두현,Park, Nam-Jib,Jee, Min-Ho,Song, Seung-Ho,Ahn, Sang-Kook,Choi, Kyo-Chang,Baik, Doo-Hyun 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.1
Poly(gylcolide-co-$\varepsilon$-caprolactone)(PGCL) was synthesized by bulk ring-opening polymerization of glycolide and $\varepsilon$-caprolactone using stannous octoate as a catalyst. Polymerization was conducted at a constant molar ratio of glycolidel-$\varepsilon$-caprolactone (55/45). The changes of copolymer chain structure according to the reaction conditions such as reaction time, temperature and catalyst feed ratio were studied by using $^1H$-NMR spectroscopy. The effects of reaction time and catalyst feed ratio on the chain microstructure of the final PGCL copolymers were found to be significant. The average sequence length of glycolyl segments in the copolymer decreased with transesterification during polymerization, which made PGCL microstructure more random.
Poly(glycolide-co-${\varepsilon}$-caprolactone) 블록 공중합체의 합성과 비등온 결정화 거동 분석
최송연,지민호,박남집,송승호,최교창,백두현,Choi, Song-Yeon,Jee, Min-Ho,Park, Nam-Jib,Song, Seung-Ho,Choi, Kyo-Chang,Baik, Doo-Hyun 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.1
Poly(glycolide-co-${\varepsilon}$-caprolactone)(PGCL) block copolymers were synthesized by two step polymerization using glycolide and ${\varepsilon}$-caprolactone as starting materials. The chain-microstructures of the resulting block copolymers were characterized by $^1H-NMR$. The structure and thermal properties of the PGCL block copolymer were strongly affected by the chain-microstructure of the prepolymer. The non-isothermal crystallization behavior of the PGCL block copolymers was examined at various cooling rates and analyzed with modified-Avrami and Ziabicki equations. The PGCL block copolymer with a lower degree of randomness in the prepolymer block had a higher crystallization temperature and faster crystallization rate, which suggests that differences in chain-microstructure of the PGCL prepolymer can affect the crystallization characteristics, such as crystallinity and crystallization rate.