含半不稳定边臂配体的钛配合物催化丙交酯聚合<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.014.009

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Abstract Polylactic acid is an important biodegradable material which has diversified applications in our daily life. We designed and synthesized six Schiff base ligands with hemilabile side arm oxygen or sulfide (L1—L6) and their corresponding complexes (C1—C6) by the reaction with tetraisopropyl titanate. The structures of the complexes were identified by elemental analysis and infrared spectroscopy. The catalytic performance in lactide ring-opening polymerization were carefully examined. Different polymerization conditions such as catalyst concentration, temperature, polymerization time as well as the catalyst structures were investigated in order to study their influences on the polymerization behaviors towards lactide with C1 as a typical example. We found the polymer yield reached the highest level of 90.35% and the molecular weight of the polymer reached 8.41×10⁴ g/mol at molar ratio of monomer to catalyst of 2 000 at 160 ℃ for 24 h. The catalyst activity decreased in the order of C6>C4>C3>C1>C2>C5 at the optimal conditions. The less bulkiness of catalyst environment around the metal center and the hemilability of the side arm which has weaker coordination ability and are both beneficial to improve the activity.

Key words： polylactic acid lactide catalyst ring-opening polymerization Schiff base ligand with hemilabile side arm tita-nium complex

Published: 25 July 2017 Online: 2018-05-04

CLC number:

O643.32+1

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	Articles by authors
	ZHU Tingting
	XIE Mingming
	GONG Dirong

Cite this article:

ZHU Tingting,XIE Mingming,GONG Dirong. Ring-opening Polymerization of Lactide Catalyzed by Titanium Complexes with Schiff Base Ligand Bearing a Hemilabile Side Arm[J]. Materials Reports, 2017, 31(14): 40-45.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.014.009 OR https://www.mater-rep.com/EN/Y2017/V31/I14/40

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