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The novel [(dME)2(HIM)P]2Ti(IV) complex: synthesize, characterization, and its utility in ROP of d,l-lactide

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Abstract

The novel {2,4-bis(1,1-dimethylethyl)-6-{[(2-hydroxyethyl)imino]methyl}phenoxy}2 titanium(IV) complex {[(dME)2(HIM)P]2Ti(IV)} had been synthesized and characterized by EA, XRF, IR, and NMR methods. The [(dME)2(HIM)P]2Ti(IV) complex was reactive and promoted ring-opening polymerization (ROP) of d,l-lactide in the presence of benzyl alcohol (BnOH). And the results showed that ROP of d,l-lactide were produced upon addition of an excess (1–8 equiv.) of external BnOH. The complex showed a living and controlled fashion (M w/M n = 1.15–1.32) for ROP of d,l-lactide and could produce the poly(d,l-lactide) with average molecular weight (M n) up to 8.87 × 104 g mol−1. The mechanism study by 1H NMR spectrum of poly(d,l-lactide) with terminal benzyl ester group and [(dME)2(HIM)P]2Ti(IV) complex revealed that the polymerization proceeded through the traditional activated monomer mechanism and the acyl-oxygen bond cleavage mode of monomer. And the 13C NMR spectra and TG/DSC analysis showed that poly(d,l-lactide) was essential atactic and thermal stable polymer.

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Acknowledgments

Financial supports from the National Natural Science Foundation of China (Nos. 11032012, 30870609, 51043004, 31170923), Chongqing Municipal Natural Science Foundation of China (Nos. CSTC2009BA4025, CSTC2009BB4382) and Chongqing Municipal Education Commission Foundation of China (KJ091415) were greatly appreciated.

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  1. Key Laboratory of Biorheological Science and Technology for Ministry of Education, and Center of Bioinspired Materials Science and Engineering of National “985 Project Program”, Bioengineering College of Chongqing University, Chongqing, 400044, China

    Chengbo Hu, Yuanliang Wang, Ya Fu, Jiaoxia Sun, Moyuan Deng & Xiongzhao Xiang

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Correspondence to Yuanliang Wang.

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Hu, C., Wang, Y., Fu, Y. et al. The novel [(dME)2(HIM)P]2Ti(IV) complex: synthesize, characterization, and its utility in ROP of d,l-lactide. Polym. Bull. 69, 511–525 (2012). https://doi.org/10.1007/s00289-012-0736-8

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