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Metal-free Lewis pair catalyst synergy for fully alternating copolymerization of norbornene anhydride and epoxides: Biocompatible tests for derived polymers
Sreenath Pappuru, Piyush Kumar Gupta, Debashis Chakraborty,
Published in Elsevier Ltd
2019
Volume: 19
   
Pages: 306 - 314
Abstract
Synthesis of high molecular weight alternating copolymers from epoxides and norbornene anhydride via metal-free catalyst remains a challenge in aliphatic biodegradable polyester synthesis. Metal-free Lewis pair catalyst system, consisting of Lewis acid B(C 2 H 5 ) 3 (triethylborane) and a Lewis base DMAP (4-dimethylaminopyridine); TBD (1, 5, 7-triazabicyclo[4.4.0]dec-5-ene) and DBU (1,8 diazabicyclo[5.4.0]undec-7-ene) as a cooperative catalyst system for fully alternating polyesters synthesis is described here. By using these simple systems we have obtained, high molecular weight (M n = 2–31.5 kDa) polyesters with narrow molecular weight distributions (MWD's = 1.948–1.069) via ring-opening alternating copolymerisation (ROAC) of various epoxides (e.g. CHO, cyclohexene oxide; PO, propylene oxide; tBGE, tert-butyl glycidyl ether and PGE, phenyl glycidyl ether) with cis-5 norbornene-endo 2, 3 dicarboxylic anhydride (NB). Furthermore, we demonstrated that these polyesters are biocompatible in nature when tested on human embryonic kidney cells (HEK-293) showing more than 80% cell viability in 72 h and can be used for different biological applications such as drug delivery, tissue engineering or anti-microbial polymeric coatings on biomedical devices. The use of these green functional polyesters for biological studies was realized for the first time by a metal-free Lewis pair approach. © 2019 Elsevier Ltd
About the journal
JournalData powered by TypesetMaterials Today Communications
PublisherData powered by TypesetElsevier Ltd
ISSN23524928
Open AccessNo
Concepts (19)
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    Biocompatibility
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    CATALYSTS
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    Cell engineering
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    Drug delivery
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    Ethers
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    Functional polymers
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    Metals
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    Molecular weight distribution
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    Polyesters
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    Tissue engineering
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    1 ,5 ,7-TRIAZABICYCLO[4.4.0]DEC-5-ENE
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    ALTERNATING COPOLYMERIZATION
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    BIODEGRADABLE POLYESTERS
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    HUMAN EMBRYONIC KIDNEY CELLS
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    Metal-free catalysts
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    NARROW MOLECULAR WEIGHT DISTRIBUTIONS
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    RING OPENING COPOLYMERIZATION
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    TERT-BUTYL GLYCIDYL ETHER
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    Copolymerization