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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 was systematically optimized, and the architecture, molecular weight and thermal properties of the polymers were characterized by NMR, FTIR, SEC and DSC analyses. Finally, a plausible polymerization mechanism was proposed.

SUBMITTER: Wang Y

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

REPOSITORIES: biostudies-literature

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

Wang Yan Y Han Yongle Y Zhang Lifang L

RSC advances 20200709 43

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(cap ...[more]

PMID: 35518598

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