Investigations on the Phase Diagram and Interaction Parameter of Poly(styrene-b-1,3-cyclohexadiene) Copolymers
Sumpter, Bobby G.
Kennemur, Justin G.
Mays, Jimmy W.
KAUST DepartmentKAUST Catalysis Center (KCC)
Physical Sciences and Engineering (PSE) Division
Polymer Synthesis Laboratory
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AbstractA series of linear diblock copolymers containing polystyrene (PS) and poly(1,3-cyclohexadiene) (PCHD) with high 1,4-microstructure (>87%) was synthesized by anionic polymerization and high vacuum techniques. Microphase separation in the bulk was examined by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) and compared to computational analysis of the predicted morphological phase diagram for this system. Because of the high conformational asymmetry between PS and PCHD, these materials self-assemble into typical morphologies expected for linear diblock copolymer systems and atypical structures. Rheological measurements were conducted and revealed order–disorder transition temperatures (TODT), for the first time for PS-b-PCHD copolymers, resulting in a working expression for the effective interaction parameter χeff = 32/T – 0.016. Furthermore, we performed computational studies that coincide with the experimental results. These copolymers exhibit well-ordered structures even at high temperatures (∼260 °C) therefore providing a better insight concerning their microphase separation at the nanoscale which is important for their potential use in nanotechnology and/or nanolithography applications.
CitationMisichronis K, Chen J, Imel A, Kumar R, Thostenson J, et al. (2017) Investigations on the Phase Diagram and Interaction Parameter of Poly(styrene-b-1,3-cyclohexadiene) Copolymers. Macromolecules 50: 2354–2363. Available: http://dx.doi.org/10.1021/acs.macromol.7b00104.
SponsorsThis work was supported by the Materials Science and Engineering Division, U.S. Department of Energy (DoE), Office of Basic Energy Sciences (BES), LLC, at Oak Ridge National Laboratory (ORNL). Part of the research was done at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. A.A. also thanks the Nuclear Magnetic Resonance Spectroscopy Facility and the Electron Microscopy Unit of the University of Ioannina. J.G.K. thanks the FSU Materials and Energy Hiring Initiative and the Donors of the American Chemical Society Petroleum Research Fund (55378-DNI7) for partial support during the preparation of this manuscript. N.H. acknowledges the support of King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)