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Al계 유기금속화합물 혼합촉매 시스템을 이용한 L-Lactide 벌크중합 특성 연구
노이현(Yee Hyeon Noh),고영수(Young Soo Ko) 한국고분자학회 2012 폴리머 Vol.36 No.1
The differences between single and mixed aluminium catalyst systems in the bulk polymerization of Llactide were studied. Al(O-i-Pr)3, TMA, TOA and TIBA were employed for the mixed-catalyst systems, and TIBA was chosen as a reference catalyst. For the Al(O-i-Pr)3/TIBA catalyst system, the conversion of polymerization increased as the composition of Al(O-i-Pr)3 in the mixed catalyst increased. The molecular weight of the resulting PLA reached to about 13000 g/mol, and the polydispersity index of the polymer from the Al(O-i-Pr)3/TIBA catalyst was slightly increased than that of single catalyst. The higher molecular weight tail or shoulder was revealed in the GPC curve. The conversion of the TOA/TIBA catalyst system decreased as the composition of TOA in the mixed catalyst increased. The molecular weight of PLA prepared with TOA/TIBA catalysts increased up to 14000 g/mol. The Al compounds-mixed catalysts could produce a higher molecular weight tail or shoulder in the GPC curve, which may result in enhancement of mechanical properties of PLA.
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