Synthesis and morphological characterization of linear and miktoarm star poly(solketal methacrylate)-block-polystyrene copolymers

Angelopoulou, Polyxeni P.; Stathouraki, Maria-Malvina; Keum, Jong K.; Hong, Kunlun; Avgeropoulos, Apostolos; Sakellariou, Georgios

doi:10.1016/j.eurpolymj.2023.111995

Title: Synthesis and morphological characterization of linear and miktoarm star poly(solketal methacrylate)-block-polystyrene copolymers

Journal Article · 20 March 2023 · European Polymer Journal

DOI: https://doi.org/10.1016/j.eurpolymj.2023.111995 · OSTI ID:2000247

Angelopoulou, Polyxeni P. ^[1]; Stathouraki, Maria-Malvina ^[2]; Keum, Jong K. ^[3]; Hong, Kunlun ^[4]; Avgeropoulos, Apostolos ^[5]; Sakellariou, Georgios ^[2]

University of Athens (Greece); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
University of Athens (Greece)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
University of Ioannina (Greece)

The synthesis, molecular characterization, and morphological evaluation of AB_n, (n = 2,3) miktoarm star block copolymers consisting of poly(glycerol monomethacrylate) (PGMA) and polystyrene (PS) with varying molecular weights and compositions is described. The system is known to demonstrate a remarkably high Flory-Huggins interaction parameter. The corresponding linear diblock copolymer analogues, were synthesized as well, and comparisons with regard to feature dimensions and morphologies are provided. Well-ordered nanostructures of various morphologies were formed with domain spacing as low as 7.2 nm. Different morphologies were attained by some of the topological isomers indicating that in miktoarm star block copolymers the phase boundaries were strongly shifted. Additionally, a triblock ABA analogue was studied to investigate the effect of triblock copolymer conformations. Noteworthy is that for copolymers with different macromolecular architecture leading to similar morphology; different domain spacings were obtained. The synthesis of all the samples was carried out by high-vacuum anionic polymerization techniques. Molecular characterization with Size Exclusion Chromatography (SEC) and Proton Nuclear Magnetic Resonance Spectroscopy (¹H NMR) confirmed well-defined copolymers obtained. The morphological characterization was accomplished by Small-Angle X-ray Scattering (SAXS). In conclusion, the observations from this study highlight the potential of incorporating macromolecular architecture in the self-assembly of strongly immiscible block copolymers to attain ultra-small nanofeatures with desired morphologies.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2000247

Journal Information:: European Polymer Journal, Journal Name: European Polymer Journal Vol. 190; ISSN 0014-3057

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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