Realizing 5.4 nm Full Pitch Lamellar Microdomains by a Solid-State Transformation
| Autor: | Jose Kenneth D. Mapas, Zhiwei Sun, Gajin Jeong, Thomas P. Russell, Javid Rzayev, Duk Man Yu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Small-angle X-ray scattering Organic Chemistry Lipid microdomain 02 engineering and technology Degree of polymerization Flory–Huggins solution theory 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Phase (matter) Solketal Polymer chemistry Materials Chemistry Copolymer Lamellar structure 0210 nano-technology |
| Zdroj: | Macromolecules. 50:7148-7154 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b01443 |
| Popis: | A simple method was developed to realize a self-assembled block copolymer (BCP) lamellar microdomain morphology with a full pitch of 5.4 nm through an acid hydrolysis of poly(solketal methacrylate-b-styrene) (PSM-b-PS). The acid hydrolysis transforms PSM-b-PS, having two hydrophobic blocks, into poly(glycerol monomethacrylate-b-styrene) (PGM-b-PS), having one hydrophilic and one hydrophobic block. This transformation markedly increases the segmental interaction parameter such that a phase-mixed PSM-b-PS can be transformed in the solid state into a microphase-separated BCP without the use of any additives. Correlation hole scattering of the PSM-b-PS in the phase mixed state yields a segmental interaction parameter (χ) given by χ = 0.0196 + 4.694/T, where T is the absolute temperature. With the symmetric BCPs used in this study, the ordered lamellar microdomain pitch was determined by small-angle X-ray scattering (SAXS) as a function of the degree of polymerization (16 ≤ N ≤ 1246). For the lamellar microdom... |
| Databáze: | OpenAIRE |
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