Transetherification of Melamine–Formaldehyde Resin Methyl Ethers and Competing Reaction of SelfCondensation Full article
Journal |
Journal of Applied Polymer Science
ISSN: 0021-8995 , E-ISSN: 1097-4628 |
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Output data | Year: 2006, Volume: 101, Number: 5, Pages: 2977-2985 Pages count : 9 DOI: 10.1002/app.23540 | ||||
Tags | Chromatrography, FTIR, Kinetics, Polycondensation, Resins | ||||
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Abstract:
Transetherification of methyl ethers of melamine-formaldehide resins (MER) with monophenyl ethers of ethylene glycol or propylene glycol (ROH) and competing reaction of self-condensation are studied depending on MER composition (amounts of CH3O-, -CH2OH, and NH2 groups), ROH type, MER/ROH molar ratio, presence or absence of acid catalysts, and temperature. High rates of self-condensation processes prevent a complete conversion of CH3O-into RO-groups. It turned out MER free of methylol groups were not able to be transetherified with high yields due to a premature gelation taking place prior to attaining 50% conversion of methoxy groups (similar to 4 mol/kg) even at low MER/ROH ratios. In contrast, transetherification of MER with methylol groups content up to 3 mol/kg affords the incorporation of RO-groups into the resin up to 8 mol/kg owing to direct etherification of -CH2OH groups. The following factors are responsible for the growth of etherified product yield: presence of methylol groups in MER in some amounts without deterioration of MER-ROH compatibilization; CH2O-/ROH molar ratio no higher than 1; primary alcohols (ROH) is more preferable compared to secondary ones; thermal activation of the process is more efficient in comparison with acidic catalysis.
Cite:
Pavlyuchenko V.N.
, Ivanchev S.S.
, Rätzsch M.
, Bucka H.
, Primachenko O.N.
, Leitner P.
, Khaikin S.Y.
Transetherification of Melamine–Formaldehyde Resin Methyl Ethers and Competing Reaction of SelfCondensation
Journal of Applied Polymer Science. 2006. V.101. N5. P.2977-2985. DOI: 10.1002/app.23540 WOS Scopus РИНЦ
Transetherification of Melamine–Formaldehyde Resin Methyl Ethers and Competing Reaction of SelfCondensation
Journal of Applied Polymer Science. 2006. V.101. N5. P.2977-2985. DOI: 10.1002/app.23540 WOS Scopus РИНЦ
Dates:
Submitted: | Mar 28, 2005 |
Accepted: | Aug 14, 2005 |
Published online: | Jun 19, 2006 |
Published print: | Sep 5, 2006 |
Identifiers:
Web of science | WOS:000239128200033 |
Scopus | 2-s2.0-33747103146 |
Elibrary | 13511984 |
Chemical Abstracts | 2006:743016 |
Chemical Abstracts (print) | 145:336415 |
OpenAlex | W2125163508 |