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|Title:||Solid-state NMR relaxometry study of phenolic resins||Authors:||ADRIAENSENS, Peter
|Issue Date:||2003||Publisher:||JOHN WILEY & SONS LTD||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:||http://hdl.handle.net/1942/2255||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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