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

Yildiz B. C., Kayan A.

Sustainable Chemistry and Pharmacy, cilt.21, ss.100416, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.scp.2021.100416
  • Dergi Adı: Sustainable Chemistry and Pharmacy
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.100416
  • Anahtar Kelimeler: Titanium alkoxide, Silyliminophenolate, Catalyst, L-lactide, epsilon-caprolactone, RING-OPENING POLYMERIZATION, ZIRCONIUM COMPOUNDS, ALKOXIDE COMPLEXES, TITANIUM, COPOLYMERIZATION, LIGANDS, IMPROVEMENT, EPOXIDES, PCL, ROP
  • Kocaeli Üniversitesi Adresli: Evet

Özet

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).