Abstract
A series of phenol-formaldehyde resol (plywood type) resins was made with various formaldehyde to phenol molar ratios (1.70, 2.00, and 2.30) and sodium hydroxide to phenol molar ratios (0.40 and 0.60). A broad viscosity range (20-1000 mPa.s) was sampled from each resin cook and characterized for pH, gel time, viscosity, alkalinity, nonvolatiles, density, molecular weight, surface tension, and contact angle. The results showed that viscosity and gel time depended on weight-average molecular weight. Condensation rate varied with formaldehyde to phenol ratio. The Cannizzaro reaction reduced alkalinity and indirectly affected viscosity and gel time. Cook procedure affected molecular weight distribution and accelerated gel times
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
