Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 112, Issue 4, Pages 2195-2202Publisher
WILEY
DOI: 10.1002/app.29532
Keywords
phenol-urea-formaldehyde; resins; methylolureas; structure; C-13-NMR analysis
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Funding
- Chinese National Science and Technology [2006BAD07A07-10]
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Phenol-urea-formaldehyde (PUF) resins were synthesized by reacting mixture Of methylolureas (MMU), phenol, and formaldehyde. The structure of PUF cocondensed resins at different stages of reaction were analyzed by liquid C-13 nuclear magnetic resonance (NMR) spectroscopy. The liquid C-13-NMR analysis indicated that methylolureas had the dominant content in MMU with the reaction between urea and formaldehyde Under the alkaline condition. The PUF cocondensed resins had no free formaldehyde. methylolureas were well incorporated into the cocondensed resins by reacting with phenolic units to form cocondensed methylene bridges. The second formaldehyde influenced the further reaction and the structure of the PUF resins. The resins with the prepared method of PUFB possessed relatively high degree of polymerization and low proportion of unreacted methylol groups. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2195-2202, 2009
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