Chain expansion process from knotted globule
| Autor: | Yoshiki Nakamura, Toshiaki Dobashi, Yasuyuki Maki, Mitsuo Nakata |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Materials science Polymers and Plastics Scattering Organic Chemistry Collapse (topology) 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Mathematics::Geometric Topology 01 natural sciences 0104 chemical sciences Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Chain (algebraic topology) chemistry Chemical physics Materials Chemistry Static light scattering Temperature drop Methyl methacrylate 0210 nano-technology |
| Zdroj: | Polymer. 178:121541 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2019.06.007 |
| Popis: | Knotting in a polymer chain was investigated by observing the chain expansion process from a collapsed chain for the solution of poly(methyl methacrylate)(PMMA) with Mw = 1.22 × 107 in the mixed solvent tert-butyl alcohol + water(2.5 vol%). Because of very slow phase separation in the solution the chain collapse after a temperature drop and chain expansion after a jump were determined by static light scattering. PMMA chain was shown to collapse rapidly to an unknotted globule, which subsequently contracted slowly to a knotted globule. The chain expansion process from the knotted globule was dominated by the chain compactness and the degree of knotting of the initial globule. A complete chain expansion from a heavily knotted globule often required a very long time indicating an existence of long-lived knots. The chain expansion from the unknotted globule occurred too fast to be followed by scattering experiment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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