Ti(IV)-silyliminophenolate catalysts for ϵ-caprolactone and L-Lactide polymerization


Yildiz B. C. , Kayan A.

SUSTAINABLE CHEMISTRY AND PHARMACY, vol.21, pp.1-10, 2021 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 21
  • Publication Date: 2021
  • Doi Number: 10.1016/j.scp.2021.100416
  • Title of Journal : SUSTAINABLE CHEMISTRY AND PHARMACY
  • Page Numbers: pp.1-10

Abstract

In this study, titanium (IV) silyliminophenolate complexes were synthesized by reactions of titanium (IV) isopropoxide with silyliminophenolate (SPIMPH2), and its 3-methoxy, 4-hydroxy, 5-bromo, 4-methyl, and 3-tert-butyl derivatives in isopropanol, respectively. The structures of compounds were elucidated by spectroscopic (FTIR, 1H, and 13C NMR) studies, thermal analysis (elemental and thermogravimetric), and mass spectrometry. Titanium (IV) silyliminophenolate complexes together with or without 9-anthracenemethanol (9-AnOH) are active catalyst systems for the ring-opening polymerization of ε-caprolactone (ε-CL) and L-lactide (LLA). Titanium complexes as catalysts showed moderate activity with 10–100% conversion of ε-caprolactone, L-lactide and co-monomers of ε-CL/LLA depending on temperatures, times, and the substituents on the iminophenol moiety. In addition to spectroscopic methods, gel permeation chromatography (GPC) was also used in the characterization of resulting polymers (PCL, PLLA, and Co-PCL/PLLA).