Probing molecular mobility during crosslinking process of commercial resins by NMR multiexponential relaxation data analysis
✍ Scribed by Sérgio de L. Campello; Ricardo E. de Souza; Walter M. de Azevedo
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 341 KB
- Volume
- 121
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
In this study, we present the experimental results for the crosslinking process of a commercial polyester resin based on measurements of the spin lattice relaxation time T~1~ of protons, as function of the crosslinking time evolution. Multiexponential decomposition of the evolution of magnetization measured in inversion‐recovery experiments is performed. The population of “rigid” and “mobile” nuclear spin sites was estimated as function of time evolution. In analogy to the usual monomer conversion u, site conversion from “mobile” to “rigid” sites u~M~ were also estimated as a function of time evolution and initial concentrations of the reagents. The multiexponential decomposition approach of T~1~ relaxation data allows one to follow crosslinking processes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011