Binary catalytic system for homo- and block copolymerization of ε-caprolactone with δ-valerolactone.

ABSTRACT: The combined interaction of 2,3,6,7-tetrahydro-5H-thiazolo[3,2-a] pyrimidine (ITU) as the organocatalytic nucleophile with YCl₃ as Lewis acid cocatalyst, generating ITU/YCl₃, was employed for homo- and copolymerization of ε-caprolactone (CL) with δ-valerolactone (VL). Poly(caprolactone) (PCL) and poly(caprolactone)-poly(ethylene glycol)-poly(caprolactone) (PCL-PEG-PCL) triblock copolymer and poly(valerolactone)-poly(caprolactone)-poly(ethylene glycol)-poly(caprolactone)-poly(valerolactone) (PVL-PCL-PEG-PCL-PVL) pentablock copolymer were successfully prepared by ring-opening polymerization (ROP) of CL employing ITU/YCl₃ as catalyst in the presence of benzyl alcohol (BnOH) or poly(ethylene glycol) (PEG) as initiator, respectively. The reaction w

SUBMITTER: Wang Y 

PROVIDER: S-EPMC9055323 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature