Zhiqiang Sun, Ranlong Duan, Han Zhang, Xuan Pang*, Xianhong Wang, Xuesi Chen
Journal of Renewable Materials, Vol.3, No.2, pp. 82-90, 2015, DOI:10.7569/JRM.2014.634133
Abstract A series of bimetallic Salen aluminum (III) complexes with different steric substituents were synthesized.
These complexes were used as catalysts to produce polylactide in the ring-opening polymerization of racemic
lactide. A kinetic research of polymerization demonstrated that the steric substituents on the phenolate ring of
the complexes had remarkable infl uence on the stereoselectivity and the polymerization activity. The highest
stereoselectivity was obtained with bulky substituent on the ortho position of the salicylidene moieties. Kinetic
studies using all these complexes indicated that the polymerizations were fi rst-ordered with respect to lactide
monomers. All these complexes gave highly isotactic polylactides with… More >
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