Journal
POLYHEDRON
Volume 31, Issue 1, Pages 682-687Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2011.10.035
Keywords
Polylactide; (R,R)-1,2-Diaminocyclohexane; Zinc complex; Ring opening polymerization; Heterotacticity
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Funding
- Kyungpook National University
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A novel dichloro zinc complex (L-1)ZnCl2, where L-1 is N,N'-bis-(2,6-dichloro-benzyl)-(R,R)-1,2-diaminocyclohexane, has been synthesized and characterized. The dimethyl derivatives, generated in situ from the well characterized dichloro zinc complexes (L-1)ZnCl2 and (L-2)ZnCl2, where L-2 is N,N'-bis-(benzyl)-(R,R)-1,2-diaminocyclohexane, were employed as initiators for the ring opening polymerization (ROP) of rac-lactide (rac-LA). The complexes were found to be highly efficient initiators yielding the polylactide (PLA) with a narrow molecular weight distribution. The catalytic activity and heterotactic selectivity of the Zn(II) complexes were affected by the substituents on the phenyl groups of benzyl moieties in (R,R)-1,2-diaminocyclohexane. The dimethyl derivative of (L-2)ZnCl2 produced highly stereocontrolled PLA with P-r = 0.75 at -25 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
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