Mechanochemical Degradation of Brush Polymers: Kinetics of Ultrasound-Induced Backbone and Arm Scission
| Autor: | Jinkyung Noh, Gregory I. Peterson, Hyunji Ma, Ki-Taek Bang, Kyoung Taek Kim, Tae-Lim Choi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Kinetics Brush 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Inorganic Chemistry Crystallography Reaction rate constant Polymerization chemistry law Materials Chemistry Contour length Degradation (geology) 0210 nano-technology Bond cleavage |
| Zdroj: | Macromolecules. 53:1623-1628 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.9b02721 |
| Popis: | The ultrasonic degradation of polynorbornene-g-polylactide and polynorbornene-g-polystyrene brush polymers was explored. First-order rate constants for backbone scission were obtained for brush polymers with varying arm lengths (ranging ca. 3–8 kDa) and backbone degrees of polymerization (ranging ca. 78–361). Master curves, in which the rate constant trends for all polymers converge, could be generated by accounting for the rate enhancement from the polymer being in an extended conformation and the contour length being equivalent to the combined length of two arms and the backbone. Slow scission of arms from the backbone was also observed, with first-order rate constants being dependent on the arm length. |
| Databáze: | OpenAIRE |
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