Abstract
Ring-opening polymerization of d, l-lactide (LA) was catalyzed by the well-defined bis(trimethyl triazacyclohexane) praseodymium triflate [(Me 3TAC) 2Pr(OTf) 3] (Cat) for the first time. The effect of the [LA]/[Cat] molar ratio, solvents, temperature, and reaction time were investigated in detail. The results show that the praseodymium catalyst is very efficient in the melt polymerization, giving d, l-PLA with molecular weights of 10 4 in good conversion. The importance of the triazacyclohexane was shown by comparison to the poor catalytic activity of Pr(OTf) 3.
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