Improvement in zinc complexes bearing Schiff base in ring-opening polymerization of ε-caprolactone: A five-membered ring system

The ring-opening polymerizations of ε-caprolactone (CL) using 5- and 6-membered ring Zn complexes bearing Schiff base as catalysts were comparatively studied. The 5-membered ring Zn complexes exhibited a considerably higher polymerization rate than the 6-membered ring Zn complexes (2–12 fold for CL...

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Veröffentlicht in:	Polymer (Guilford) 2019-11, Vol.182, p.121812, Article 121812
Hauptverfasser:	Lai, Feng-Jie, Chiu, Li-Ling, Lee, Chieh-Ling, Lu, Wei-Yi, Lai, Yi-Chun, Ding, Shangwu, Chen, Hsuan-Ying, Wu, Kuo-Hui
Format:	Artikel
Sprache:	eng
Schlagworte:	Catalysts Coordination compounds Imines Polymerization Ring opening polymerization Schiff base Zinc Zinc complex ε-Caprolactone
Online-Zugang:	Volltext
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Zusammenfassung:	The ring-opening polymerizations of ε-caprolactone (CL) using 5- and 6-membered ring Zn complexes bearing Schiff base as catalysts were comparatively studied. The 5-membered ring Zn complexes exhibited a considerably higher polymerization rate than the 6-membered ring Zn complexes (2–12 fold for CL polymerization) did. X-ray data revealed that 5-membered ring L5-Ph2Zn creates larger empty space around the Zn center than 6-membered ring L6-Bn2Zn. This allows higher interaction between the initiator and Zn complex and easy CL coordination. [Display omitted] •The 5-membered ring Zn complexes exhibited a considerably higher polymerization rate.•X5-membered ring L5-Ph2Zn creates larger empty space around the Zn center than 6-membered ring L6-Bn2Zn
ISSN:	0032-3861 1873-2291
DOI:	10.1016/j.polymer.2019.121812