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조봉상,강신춘,김명준,정슬기 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
2,5-Furandicarboxylic acid (FDCA) was synthesized by KMnO4 oxidation of 2,5-dihydroxymethylfuran (DHMF) derived from biomass. The poly(butylene 2,5-furandicarboxylate)/Cloisite 30B (PBF30B) composites were prepared by esterification and polycondensation of FDCA with 1,4-butane diol. PBF30B composites containing 1, 2, and 4 phrs Cloisite 30B were prepared. The FDCA and PBF30B composites were characterized by Fourier transform infrared spectroscopy (FT-IR), and X-ray diffractometry (XRD). The thermal decomposition kinetics of PBF 30B composites were studied by thermogravimetric analysis (TGA) under conditions of 1, 2, 4, 6, and 8 oC/min. The activation energies of PBF30B composites were investigated by Arrhenius regression, the Flynn-Wall-Ozawa method, original Vyazovkin method and advanced iso-conversion method. From the standpoint of activation energy for the decomposition of PBF 30B composites, the different kinetic methods shared the same tendency. The Vyazovkin method yielded the maximum activation energies of PBF30B composites containing 1, 2, and 4 phrs Cloisite 30B which were 190, 140, and 160 kJ/mol, respectively.
Synthesis and Characterization of Poly(ferrocenyl glycidyl ether)-1,2-Butylene Oxide Copolymers
조봉상,노시태,김정수,이재명,권정옥 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
Five different samples of poly(epichlorohydrin-co-1,2-butylene oxide) (poly(ECH-co-BO)) were synthesizedby ring opening cationic copolymerization in the presence of BF3-etherate with diethyleneglycol as an initiatorsystem. Poly(ferrocenyl glycidyl ether)-butylene oxide (poly(FcGE)-BO) copolymers were obtained by a substitutionreaction of ferrocene methanol with the epichlorohydrin (ECH) unit in poly(ECH-co-BO) under basic conditions. Structural analysis of all products was performed using Fourier transform infrared (FTIR) spectroscopy andnuclear magnetic resonance (NMR). The thermal behaviors of the poly(ECH-co-BO) and poly(FcGE)-BO copolymerswere compared using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). As ironcontent increased, the Tg of poly(FcGE)-BO copolymers also increased. The decomposition temperature of poly(ECH-co-BO) was higher than those of poly(FcGE)-BO copolymers.
조봉상,노시태 한국고분자학회 2013 Macromolecular Research Vol.21 No.2
2-(Methoxymethyl)oxirane (MOMO) was used as a co-monomer for ring-opening polymerization, and four different samples of poly(epichlorohydrin-co-2-(methoxymethyl)oxirane) (poly(ECH-co-MOMO)) were synthesized by cationic ring opening copolymerization in the presence of BF3-etherate and 1,4-butandiol as an initiator system. Further, ferrocene modified copolymers were obtained by a substitution reaction of ferrocene methanol with the epichlorohydrin (ECH) unit in poly (ECH-co-MOMO) under mild conditions. Structural analysis of all products was performed using Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). The thermal behaviors of the poly(ECH-co-MOMO) and ferrocene-modified poly(ECH-co-MOMO) were compared using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The glass transition temperatures (Tg) of PECH and PMOMO were -47 and -61 oC, respectively. As the contents of PMOMO increased, the Tg of the poly(ECH-co-MOMO)s were decreased and the onset of thermal decomposition shifted to a higher temperature. The decomposition temperature of poly(ECH-co-MOMO) was higher than that of the ferrocene-modified poly(ECH-co-MOMO).