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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3576

Title: DEVELOPMENT AND OPTIMIZATION OF FAST QUANTITATIVE C-13 NMR CHARACTERIZATION METHODS OF NOVOLAC RESINS
Authors: OTTENBOURGS, BT
ADRIAENSENS, Peter
REEKMANS, BJ
CARLEER, Robert
VANDERZANDE, Dirk
GELAN, Jan
Issue Date: 1995
Publisher: AMER CHEMICAL SOC
Citation: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 34(4). p. 1364-1370
Abstract: An improved C-13 NMR quantification technique of random and high-ortho novolacs in THF-CDCl3 solutions is reported. Full quantitative spectra of phenol formaldehyde resins with high signal-to-noise ratios are obtained by using chromium acetylacetonate under optimized spectral conditions within a few hours of spectrometer time. Attached proton test (APT) spectra were acquired to enable proper peak assignments in the region with significant overlap. For several novolacs, prepared under different catalytic conditions, the degree of polymerization, degree of branching, number average molecular weight, isomeric distribution, and number of unreacted ortho and para phenol ring positions could accurately be determined. The improved quantification method and the use of the aromatic instead of the aliphatic region permitted to measure for the first time small differences in network parameters for comparable novolac samples.
Notes: LIMBURGS UNIV CENTRUM,INST MAT RES,DEPT ORGAN CHEM,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3576
DOI: 10.1021/ie00043a042
ISI #: A1995QR13700042
ISSN: 0888-5885
Type: Journal Contribution
Appears in Collections: Research publications

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