Use of pyrazoles as ligands greatly enhances the catalytic activity of titanium iso-propoxide for the ring-opening polymerization of l-lactide: A cooperation effect

Tzu Fang Wang, Someswara Rao Kosuru, Shu Chun Yu, Yung Chi Chang, Hsin Yu Lai, Yu Lun Chang, Kuo Hui Wu, Shangwu Ding, Hsuan Ying Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Using TiOiPr4 with a pyrazole ligand for one-pot LA polymerization improved catalytic activity compared with using TiOiPr4 only. At 60 °C, TiOiPr4 with furPz exhibited a higher catalytic activity (approximately 3-fold) than TiOiPr4. At room temperature, TiOiPr4 with BuPz exhibited a higher catalytic activity (approximately 17-fold) than TiOiPr4. High molecular mass PLA (MnGPC = 51 100, and Đ = 1.10) could be produced by using TiOiPr4 with furPz in melt polymerization ([TiOiPr4] : [furPz] = 1000 : 1 : 1 at 100 °C, 240 min). The crystal structure of MePz2Ti2OiPr7 revealed the cooperative activation between two Ti atoms during LA polymerization. This journal is

Original languageEnglish
Pages (from-to)40690-40696
Number of pages7
JournalRSC Advances
Volume10
Issue number67
DOIs
StatePublished - 9 Nov 2020

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