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Title: Solid-state NMR relaxometry study of phenolic resins
Authors: ADRIAENSENS, Peter 
REGO, Robby 
CARLEER, Robert 
Issue Date: 2003
Source: POLYMER INTERNATIONAL, 52(10). p. 1647-1652
Abstract: H-1 wideline and C-13 CP/MAS spin-lattice (T-1H) relaxation solid-state NMR experiments have been performed in order to investigate the cure state of phenolic novolac resins. Due to the process of spin diffusion, a single averaged T-1H decay time was found which was sensitive to the cure state of the network structure. Measurements as a function of temperature revealed that mobile end-groups and branches determine the most efficient pathway of T-1H relaxation. Combined with FTIR measurements, it is shown that rearrangements of the hydrogen bond structure take place upon heating-cooling. There are strong indications that the process of disruption-reformation of the hydrogen bonds is not completely reversible. (C) 2003 Society of Chemical Industry.
Notes: Univ Limburg, IMO, Dept SBG, B-3590 Diepenbeek, Belgium.Gelan, J, Univ Limburg, IMO, Dept SBG, Univ Campus,Gebouw D, B-3590 Diepenbeek, Belgium.
Keywords: molecular dynamics; curing; hydrogen bonds
Document URI:
ISSN: 0959-8103
e-ISSN: 1097-0126
DOI: 10.1002/pi.1351
ISI #: 000185669500016
Category: A1
Type: Journal Contribution
Validations: ecoom 2004
Appears in Collections:Research publications

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