Comparison study of ε-caprolactone, L-lactide, and ε-decalactone polymerizations using aluminum complexes bearing pyrazole derivatives, and synthesis of polylactide-gradual-poly-ε-caprolactone copolymer

Feng Jie Lai, Shu Chun Yu, Yung Chi Chang, Tzu Yi Wu, Kuo Hui Wu, Yu Lun Chang, Shangwu Ding, Hsuan Ying Chen, Chian Hui Lai

Research output: Contribution to journalArticlepeer-review

Abstract

This study compared ε-caprolactone (CL), L-lactide (LA), and ε-decalactone (DL) polymerizations, where aluminum complexes bridged by two pyrazole ligands was used as catalysts. The reactivites of these Al complexes between CL, LA, and DL polymerization were different that LBu2Al2Me4, with the distort boat form, exhibits the greatest catalytic activity for LA and DL polymerization at 60°C but the lowest catalytic activity for CL polymerization at room temperature. This may be because dinuclear LBu2Al2Me4 cannot react with BnOH to form aluminum benzyl oxide at room temperature, making it unable to reduce catalytic activity. Because these aluminum complexes had different reactivities for LA and CL polymerizations, the selectivity of polylactide-gradual-poly-ε-caprolactones (PLA(10–80%)-gradual-PCL(59–79%)) (PLA-g-PCLs) was observed.

Original languageEnglish
Pages (from-to)1400-1409
Number of pages10
JournalJournal of Polymer Science
Volume58
Issue number10
DOIs
StatePublished - 15 May 2020

Keywords

  • aluminum complex
  • L-lactide
  • pyrazole
  • ring-opening polymerization
  • ε-decalactone

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