Investigations on the Phase Diagram and Interaction Parameter of Poly(styrene-b-1,3-cyclohexadiene) Copolymers

Misichronis, Konstantinos; Chen, Jihua; Imel, Adam; Kumar, Rajeev; Thostenson, James; Hong, Kunlun; Dadmun, Mark; Sumpter, Bobby G.; Kennemur, Justin G.; Hadjichristidis, Nikos; Mays, Jimmy W.; Avgeropoulos, Apostolos

doi:10.1021/acs.macromol.7b00104

Investigations on the Phase Diagram and Interaction Parameter of Poly(styrene-b-1,3-cyclohexadiene) Copolymers

Journal Article · Wed Mar 15 00:00:00 EDT 2017 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.7b00104· OSTI ID:1376418

^[1]; Chen, Jihua ^[2]; Imel, Adam ^[3]; ^[4]; Thostenson, James ^[5]; ^[2]; ^[3]; ^[4]; Kennemur, Justin G. ^[6]; ^[7]; Mays, Jimmy W. ^[3]; ^[8]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry; Univ. of Ioannina (Greece). Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computer Science and Mathematics Division
Duke Univ., Durham, NC (United States). Shared Materials Instrumentation Facility
Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry
King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia). Physical Sciences and Engineering Division. KAUST Catalysis Center. Polymer Synthesis Lab.
Univ. of Ioannina (Greece). Dept. of Materials Science and Engineering

A 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 in this paper 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 (T_ODT), for the first time for PS-b-PCHD copolymers, resulting in a working expression for the effective interaction parameter χ_eff = 32/T – 0.016. Furthermore, we performed computational studies that coincide with the experimental results. Finally, 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.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Ioannina (Greece)

Sponsoring Organization:: American Chemical Society Petroleum Research Fund (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Contributing Organization:: Duke Univ., Durham, NC (United States); King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia); Univ. of Tennessee, Knoxville, TN (United States)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1376418

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 6 Vol. 50; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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