| Full text | |
| Author(s): |
Franco, Roberto W. A.
[1]
;
Brasil, Carlos A.
[1]
;
Mantovani, Gerson L.
[1]
;
de Azevedo, Eduardo R.
[1]
;
Bonagamba, Tito J.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | MATERIALS; v. 6, n. 1, p. 47-64, JAN 2013. |
| Web of Science Citations: | 4 |
| Abstract | |
In this study, Cross-Polarization Magic-angle Spinning CP/MAS, 2D Exchange, Centerband-Only Detection of Exchange (CODEX), and Separated-Local-Field (SLF) NMR experiments were used to study the molecular dynamics of poly(ethylene glycol) (PEG) inside Hectorite/PEG intercalation compounds in both single-and double-layer configurations. The results revealed that the overall amplitude of the motions of the PEG chain in the single-layer configuration is considerably smaller than that observed for the double-layer intercalation compound. This result indicates that the effect of having the polymer chain interacting with both clay platelets is to produce a substantial decrease in the motional amplitudes of those chains. The presence of these dynamically restricted segments might be explained by the presence of anchoring points between the clay platelets and the PEG oxygen atoms, which was induced by the Na+ cations. By comparing the PEG motional amplitudes of the double-layered nanocomposites composed of polymers with different molecular weights, a decrease in the motional amplitude for the smaller PEG chain was observed, which might also be understood using the presence of anchoring points. (AU) | |
| FAPESP's process: | 09/18354-8 - Dynamics and structure of polymer systems as studied by nuclear magnetic resonance |
| Grantee: | Eduardo Ribeiro de Azevedo |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 09/54880-6 - Manipulation of nuclear spins by magnetic and quadrupole resonance techniques |
| Grantee: | Tito José Bonagamba |
| Support Opportunities: | Regular Research Grants |