| Autor: |
XU Guang-yong, DONG Man-yuan, MA Jian-feng, ZHANG Li-min |
| Jazyk: |
čínština |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Chinese Journal of Magnetic Resonance, Vol 36, Iss 04, Pp 544-554 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1000-4556 |
| DOI: |
10.11938/cjmr20192718 |
| Popis: |
Molecular dynamics of semi-crystalline poly(3-hydroxybutyrate) (PHB) and copolymers poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing 5 wt.% (PHBV5) and 12 wt.% (PHBV12) 3-hydroxyvalerate monomer was studied with solid-state NMR spectroscopy. Proton spin-lattice relaxation times in the laboratory frame (T1) and rotating frame (T1ρ) were measured over the temperature range of 150~370 K. Kubo-Tomita expression fitting to the changes of relaxation times with temperature was used to obtain the molecular dynamics parameters (i.e., Ea and τ0) in the crystalline and amorphous regions of PHB, PHBV5 and PHBV12. These results yielded molecular-level insights into the structural modification and enhancement of the PHB. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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