Isothiourea‐based lewis pairs for homopolymerization and copolymerization of 2,2‐dimethyltrimethylene carbonate with ε‐caprolactone and ω‐pentadecalactone
作者： Jun‐Hua Bai , Jin‐Hua Wang , Li‐Fang Zhang
DOI: 10.1002/POLA.29543
关键词:
摘要: In this study, the homopolymerization of 2,2‐dimethyltrimethylene carbonate (DTC) and its copolymerizations with e‐caprolactone (CL) were carried out in detail using isothiourea‐based Lewis pairs comprised 2,3,6,7‐tetrahydro‐5H‐thiazolo(3,2‐a)pyrimidine magnesium halides (MgX₂) benzyl alcohol (BnOH) as initiator. The copolymerization DTC CL via one‐pot addition produced randomly sequenced copolymers. On other hand, a well‐defined linear poly(e‐caprolactone)–block–poly(2,2‐dimethyltrimethylene carbonate) (PCL‐b‐PDTC) diblock copolymer was prepared by simple sequential ring‐opening polymerization DTC. addition, poly(ω‐pentadecalactone)–block–PDTC successfully same strategy. Moreover, PDTC–poly(ethylene glycol) (PEG)–PDTC triblock synthesized presence PEG 2000. effects different conditions on reactions have been systematically discussed. resulting polymers characterized ¹H ¹³C NMR spectra, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI‐ToF MS). block copolyester structures confirmed spectroscopy DSC characterizations. These results indicated that supposed mechanism dual catalytic mechanism. proposed involved activation monomer coordination to MgX₂, initiator deprotonated base. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Chem. 2019, 57, 2349–2355
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