Synthesis and characterization of Ti(Tbse)2 and its application as a catalyst for ROP of rac‐Lactide |
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| Authors: | Chengbo Hu Yuanliang Wang Hongzhao Xiang Ya Fu Chunhua Fu Jiaoxia Sun Yan Xiang Changshun Ruan Xiang Li |
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| Affiliation: | 1. Key Laboratory of Biorheological Science and Technology for the Ministry of Education, and Center of Bioinspired Materials Science and Engineering of National ‘985 Project Program’, Bioengineering College of Chongqing University, Chongqing 400044, China;2. College of Material and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China;3. College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China |
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| Abstract: | A novel bis(3,5‐di‐ tert‐butylsalicylaldehyde‐co‐ethanolamine) titanium(IV) complex (Ti(Tbse)2) was synthesized and structurally characterized. The X‐ray diffraction results showed that the titanium ion was bonded with two 3,5‐di‐tert‐butylsalicylaldehyde‐co‐ethanolamine ligands (Tbse ligands) in O,N,O‐tridentate mode. Experimental results revealed that the Ti(Tbse)2 complex could efficiently catalyze the ring‐opening polymerization (ROP) of rac‐lactide and showed a well‐controlled manner at 160 °C, and the polymers obtained had a controlled molecular weight and low polydispersity indices. Kinetic studies showed that the polymerization reaction was second order in monomer concentration and first order in catalyst concentration, and the apparent activation energy (Ea = 77.0 kJ mol?1) and frequency factor (A = 3.3 × 1011) were obtained according to the Arrhenius equation. 13C nuclear magnetic resonance spectra and thermogravimetric and differential scanning calorimetry analysis indicated that the polylactide was essentially a heterotactic and thermally stable polymer. Copyright © 2012 Society of Chemical Industry |
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| Keywords: | rac‐lactide titanium(IV) complex ring‐opening polymerization kinetics |
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