Effects of Tailored Dispersity on the Self-Assembly of Dimethylsiloxane-Methyl Methacrylate Block Co-Oligomers
| Autor: | Jing M. Ren, Christopher M. Bates, Athina Anastasaki, Alaina J. McGrath, Kris T. Delaney, Mitchell D. Nothling, Luke A. Connal, Morgan W. Schulze, Craig J. Hawker, Paul G. Clark, Bernd Oschmann, Jimmy Lawrence, Yingdong Luo, Christian W. Pester |
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| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Molar mass Materials science Polymers and Plastics Scattering Transition temperature Organic Chemistry Dispersity 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Polymerization chemistry Chemical engineering Phase (matter) Polymer chemistry Materials Chemistry Methyl methacrylate 0210 nano-technology |
| Zdroj: | ACS macro letters. 6(7) |
| ISSN: | 2161-1653 |
| Popis: | The effect of dispersity on block polymer self-assembly was studied in the monodisperse limit using a combination of synthetic chemistry, matrix-assisted laser desorption ionization spectroscopy, and small-angle X-ray scattering. Oligo(methyl methacrylate) (oligoMMA) and oligo(dimethylsiloxane) (oligoDMS) homopolymers were synthesized by conventional polymerization techniques and purified to generate an array of discrete, semidiscrete, and disperse building blocks. Coupling reactions afforded oligo(DMS–MMA) block polymers with precisely tailored molar mass distributions spanning single molecular systems (Đ = 1.0) to low-dispersity mixtures (Đ ≈ 1.05). Discrete materials exhibit a pronounced decrease in domain spacing and sharper scattering reflections relative to disperse analogues. The order–disorder transition temperature (TODT) also decreases with increasing dispersity, suggesting stabilization of the disordered phase, presumably due to the strengthening of composition fluctuations at the low molar mas... |
| Databáze: | OpenAIRE |
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