Investigations on the Phase Diagram and Interaction Parameter of Poly(styrene-b-1,3-cyclohexadiene) Copolymers
- 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 (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. 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.
- Research Organization:
- Florida State Univ., Tallahassee, FL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Ioannina (Greece)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); American Chemical Society Petroleum Research Fund (United States)
- Contributing Organization:
- Univ. of Tennessee, Knoxville, TN (United States); King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia); Duke Univ., Durham, NC (United States)
- Grant/Contract Number:
- AC05-00OR22725; 55378-DNI7
- OSTI ID:
- 1376418
- Journal Information:
- Macromolecules, Vol. 50, Issue 6; ISSN 0024-9297
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
On the morphological behavior of ABC miktoarm stars containing poly(cis 1,4-isoprene), poly(styrene), and poly(2-vinylpyridine): On the Morphological Behavior of ABC Miktoarm Stars Containing Poly(cis 1,4-isoprene), Poly(styrene), and Poly(2-vinylpyridine)
|
journal | October 2018 |
Similar Records
Morphologies of poly(cyclohexadiene) diblock copolymers: Effect of conformational asymmetry
Morphologies of poly(cyclohexadiene) diblock copolymers