Phenolic resins. (II): Influence of the chemical structure of high molecular weight molecules on the mechanisms of cross-linking and on the final structure of the resins

The physicochemical characterization of the structures of the oligomers (n < 4) in resols has been carried out by fragmenting monomers in LC/UV/MS and LC/UV/MS/MS. Fragmentation mechanisms are related to the numbers and positions of substituents on the aromatic ring and to the types of oligomer j...

Full description

Saved in:
Bibliographic Details
Published in:Polymers & polymer composites 2003-01, Vol.11 (4), p.233-262
Main Authors: BOUAJILA, J, RAFFIN, G, WATON, H, SANGLAR, C, PAISSE, J. O, GRENIER-LOUSTALOT, M. F
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Chemical properties
Chemical Sciences
Exact sciences and technology
Polymer industry, paints, wood
Properties and testing
Technology of polymers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The physicochemical characterization of the structures of the oligomers (n < 4) in resols has been carried out by fragmenting monomers in LC/UV/MS and LC/UV/MS/MS. Fragmentation mechanisms are related to the numbers and positions of substituents on the aromatic ring and to the types of oligomer junctions. It was more difficult to determine the structures of phenol hemiacetals and dimer hemiacetals because of the large number of position isomers. The resols were prepared with differing molar ratios R = Formaldehyde/Phenol and catalysts. They were cross-linked using two industrially recommended heat cycles. The progression of resin cross-linking was determined by solid state 13 C NMR (CP/MAS). The residual percentage of monomers and oligomers at n < 4 was determined in leachates (water and methanol) and characterized by LC/UV/MS. The results for cross-linking advancement were correlated with the various synthesis parameters (ratio R, type of catalyst and heat cycle).
ISSN:0967-3911
1478-2391
DOI:10.1177/096739110301100401