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    Morphologies of ABC triblock terpolymer melts containing poly(Cyclohexadiene): Effects of conformational asymmetry

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    Type
    Article
    Authors
    Kumar, Rajeev Senthil
    Sides, Scott W.
    Goswami, Monojoy
    Sumpter, Bobby G. cc
    Hong, Kunlun cc
    Wu, Xiaodong
    Russell, Thomas P.
    Gido, Samuel P.
    Misichronis, Konstantinos cc
    Rangou, Sofia
    Avgeropoulos, Apostolos cc
    Tsoukatos, Thodoris
    Hadjichristidis, Nikos cc
    Beyer, Frederick L.
    Mays, Jimmy Wayne
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Polymer Synthesis Laboratory
    Date
    2013-01-31
    Online Publication Date
    2013-01-31
    Print Publication Date
    2013-02-12
    Permanent link to this record
    http://hdl.handle.net/10754/562652
    
    Metadata
    Show full item record
    Abstract
    We have synthesized linear ABC triblock terpolymers containing poly(1,3-cyclohexadiene), PCHD, as an end block and characterized their morphologies in the melt. Specifically, we have studied terpolymers containing polystyrene (PS), polybutadiene (PB), and polyisoprene (PI) as the other blocks. Systematically varying the ratio of 1,2- /1,4-microstructures of poly(1,3-cyclohexadiene), we have studied the effects of conformational asymmetry among the three blocks on the morphologies using transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and self-consistent field theory (SCFT) performed with PolySwift++. Our work reveals that the triblock terpolymer melts containing a high percentage of 1,2-microstructures in the PCHD block are disordered at 110 C for all the samples, independent of sequence and volume fraction of the blocks. In contrast, the triblock terpolymer melts containing a high percentage of 1,4-microstructure form regular morphologies known from the literature. The accuracy of the SCFT calculations depends on calculating the χ parameters that quantify the repulsive interactions between different monomers. Simulations using χ values obtained from solubility parameters and group contribution methods are unable to reproduce the morphologies as seen in the experiments. However, SCFT calculations accounting for the enhancement of the χ parameter with an increase in the conformational asymmetry lead to an excellent agreement between theory and experiments. These results highlight the importance of conformational asymmetry in tuning the χ parameter and, in turn, morphologies in block copolymers. © 2012 American Chemical Society.
    Citation
    Kumar, R., Sides, S. W., Goswami, M., Sumpter, B. G., Hong, K., Wu, X., … Mays, J. W. (2013). Morphologies of ABC Triblock Terpolymer Melts Containing Poly(Cyclohexadiene): Effects of Conformational Asymmetry. Langmuir, 29(6), 1995–2006. doi:10.1021/la304576c
    Publisher
    American Chemical Society (ACS)
    Journal
    Langmuir
    DOI
    10.1021/la304576c
    ae974a485f413a2113503eed53cd6c53
    10.1021/la304576c
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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