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    All-Polycarbonate Thermoplastic Elastomers Based on Triblock Copolymers Derived from Triethylborane-Mediated Sequential Copolymerization of CO2 with Various Epoxides

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    Type
    Article
    Authors
    Jia, Mingchen cc
    Zhang, Dongyue
    de Kort, Gijs W.
    Wilsens, Carolus H. R. M. cc
    Rastogi, Sanjay cc
    Hadjichristidis, Nikos cc
    Gnanou, Yves cc
    Feng, Xiaoshuang cc
    KAUST Department
    Academic Affairs
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Office of the VP
    Physical Science and Engineering (PSE) Division
    Polymer Synthesis Laboratory
    KAUST Grant Number
    BAS/1/1374-01-01
    Date
    2020-06-29
    Online Publication Date
    2020-06-29
    Print Publication Date
    2020-07-14
    Submitted Date
    2020-05-05
    Permanent link to this record
    http://hdl.handle.net/10754/663955
    
    Metadata
    Show full item record
    Abstract
    Various oxirane monomers including alkyl ether or allyl-substituted ones such as 1-butene oxide, 1-hexene oxide, 1-octene oxide, butyl glycidyl ether, allyl glycidyl ether, and 2-ethylhexyl glycidyl ether were anionically copolymerized with CO2 into polycarbonates using onium salts as initiator in the presence of triethylborane. All copolymerizations exhibited a “living” character, and the monomer consumption was monitored by in situ Fourier-transform infrared spectroscopy. The various polycarbonate samples obtained were characterized by 1H NMR, GPC, and differential scanning calorimetry. In a second step, all-polycarbonate triblock copolymers demonstrating elastomeric behavior were obtained in one pot by sequential copolymerization of CO2 with two different epoxides, using a difunctional initiator. 1-Octene oxide was first copolymerized with CO2 to form the central soft poly(octene carbonate) block which was flanked by two external rigid poly(cyclohexene carbonate) blocks obtained through subsequent copolymerization of cyclohexene oxide with CO2. Upon varying the ratio of 1-octene oxide to cyclohexene oxide and their respective ratios to the initiator, three all-polycarbonate triblock samples were prepared with molar masses of about 350 kg/mol and 22, 26, and 29 mol % hard block content, respectively. The resulting triblock copolymers were analyzed using 1H NMR, GPC, thermogravimetric analysis, differential scanning calorimetry, and atomic force microscopy. All three samples demonstrated typical elastomeric behavior characterized by a high elongation at break and ultimate tensile strength in the same range as those of other natural and synthetic rubbers, in particular those used in applications such as tissue engineering.
    Citation
    Jia, M., Zhang, D., de Kort, G. W., Wilsens, C. H. R. M., Rastogi, S., Hadjichristidis, N., … Feng, X. (2020). All-Polycarbonate Thermoplastic Elastomers Based on Triblock Copolymers Derived from Triethylborane-Mediated Sequential Copolymerization of CO2 with Various Epoxides. Macromolecules. doi:10.1021/acs.macromol.0c01068
    Sponsors
    This research work is supported by KAUST under baseline funding (BAS/1/1374-01-01).
    Publisher
    American Chemical Society (ACS)
    Journal
    Macromolecules
    DOI
    10.1021/acs.macromol.0c01068
    PubMed Central ID
    PMC7467772
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.macromol.0c01068
    https://pubs.acs.org/doi/pdf/10.1021/acs.macromol.0c01068
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.macromol.0c01068
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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