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| Titel: |
NMR Molecular Dynamic and Thermal Analysis Studies of Amescla Resin |
| Auteur: |
Silva, Emerson O. Tavares, Maria Ines B. Nogueira, Jose S. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 56 (2007) nr. 12 pagina's 1119-1125 |
| Jaar: |
2007-12 |
| Inhoud: |
Natural resins have been a subject of the authors' research group since 2000 and a study involves a methodology to better analyze this type of sample was already published [1]. That study recommended that the first study should be done in the solid state. And in this case the authors decided to first investigate the molecular dynamic, using nuclear magnetic resonance from the measurements of proton spin-lattice and spin-spin relaxation time and the thermal parameters. The polymer relaxation processes occur over a wide range of time and length scales. A molecular-level understanding of such processes can lead to improved production methods and mechanical properties of the polymeric materials. The thermal motions, such as the glass transitions (Tg), occur at ∼ 100 Å. This work has demonstrated that the molecular dynamic of natural resins, as amescla resin is very well characterized by the relaxation parameters, using both high and low field NMR techniques. The thermal measurements corroborate the NMR data. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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