Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization
Diphenyl phosphate (DPP) was exploited as an organocatalyst to synthesize copolymers by ring-opening polymerization with α-bromo-γ-butyrolactone (αBrγBL) and ε-caprolactone (εCL) as monomers and polyethylene glycol (PEG) as initiator. The conversion rates of monomers and molecular weights of copolym...
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doaj-be7be582d1714a37bff801102c27057a2020-11-25T02:12:50ZengTaylor & Francis GroupDesigned Monomers and Polymers1568-55512018-01-0121119320110.1080/15685551.2018.15502881550288Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerizationChen Gao0Chi-Hui Tsou1Chun-Yan Zeng2Li Yuan3Rui Peng4Xue-Mei Zhang5Sichuan University of Science and EngineeringSichuan University of Science and EngineeringSichuan University of Science and EngineeringSichuan University of Science and EngineeringSichuan University of Science and EngineeringSichuan University of Science and EngineeringDiphenyl phosphate (DPP) was exploited as an organocatalyst to synthesize copolymers by ring-opening polymerization with α-bromo-γ-butyrolactone (αBrγBL) and ε-caprolactone (εCL) as monomers and polyethylene glycol (PEG) as initiator. The conversion rates of monomers and molecular weights of copolymers synthesized under different conditions were determined by 1H-NMR. The 1H-NMR results showed that the copolymers of αBrγBL and εCL initiated by PEG (PEGCB) were successfully synthesized and the conversions of εCL were relatively high (>70%), while the conversions of αBrγBL were relatively low (<26%). The highest molar ratio of αBrγBL to εCL units in these copolymers is 0.17, when the copolymerization was carried out at 100℃ for 17h. The bromine atoms hanged on the chain of the copolymers PEGCB provide a good opportunity to construct graft copolymers via atom transfer radical polymerization (ATRP). The subsequent grafting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) was conducted by using PEGCB3 as macroinitiator, CuBr/N,N’,N’,N”,N”- pentamethyldiethylenetriamine (PMDETA) as catalysts and toluene/anisole as solvents via ATRP. According to the analysis of 1H-NMR, the grafting efficiency, grafting ratio and grafting frequency were 22.4%, 160.7% and 1133.8, respectively.http://dx.doi.org/10.1080/15685551.2018.1550288εCLαBrγBLDPPring-opening polymerizationATRPfunctional aliphatic polyester |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chen Gao Chi-Hui Tsou Chun-Yan Zeng Li Yuan Rui Peng Xue-Mei Zhang |
spellingShingle |
Chen Gao Chi-Hui Tsou Chun-Yan Zeng Li Yuan Rui Peng Xue-Mei Zhang Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization Designed Monomers and Polymers εCL αBrγBL DPP ring-opening polymerization ATRP functional aliphatic polyester |
author_facet |
Chen Gao Chi-Hui Tsou Chun-Yan Zeng Li Yuan Rui Peng Xue-Mei Zhang |
author_sort |
Chen Gao |
title |
Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
title_short |
Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
title_full |
Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
title_fullStr |
Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
title_full_unstemmed |
Organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
title_sort |
organocatalyzed ring-opening copolymerization of α-bromo-γ-butyrolactone with ε-caprolactone for the synthesis of functional aliphatic polyesters – pre-polymers for graft copolymerization |
publisher |
Taylor & Francis Group |
series |
Designed Monomers and Polymers |
issn |
1568-5551 |
publishDate |
2018-01-01 |
description |
Diphenyl phosphate (DPP) was exploited as an organocatalyst to synthesize copolymers by ring-opening polymerization with α-bromo-γ-butyrolactone (αBrγBL) and ε-caprolactone (εCL) as monomers and polyethylene glycol (PEG) as initiator. The conversion rates of monomers and molecular weights of copolymers synthesized under different conditions were determined by 1H-NMR. The 1H-NMR results showed that the copolymers of αBrγBL and εCL initiated by PEG (PEGCB) were successfully synthesized and the conversions of εCL were relatively high (>70%), while the conversions of αBrγBL were relatively low (<26%). The highest molar ratio of αBrγBL to εCL units in these copolymers is 0.17, when the copolymerization was carried out at 100℃ for 17h. The bromine atoms hanged on the chain of the copolymers PEGCB provide a good opportunity to construct graft copolymers via atom transfer radical polymerization (ATRP). The subsequent grafting of 2-(dimethylamino)ethyl methacrylate (DMAEMA) was conducted by using PEGCB3 as macroinitiator, CuBr/N,N’,N’,N”,N”- pentamethyldiethylenetriamine (PMDETA) as catalysts and toluene/anisole as solvents via ATRP. According to the analysis of 1H-NMR, the grafting efficiency, grafting ratio and grafting frequency were 22.4%, 160.7% and 1133.8, respectively. |
topic |
εCL αBrγBL DPP ring-opening polymerization ATRP functional aliphatic polyester |
url |
http://dx.doi.org/10.1080/15685551.2018.1550288 |
work_keys_str_mv |
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1724907987366051840 |