Effect of resol phenol-formaldehyde resin modification with the products
of poly(ethylene terephthalate) chemical degradation on the properties of the resin
Polimery 2004, No 6, 408
There were synthesized the resol phenol-formaldehyde resins (PF) modified with various amounts (up to 20 wt. %) of the products of poly(ethylene terephthalate) [PET(N)] chemical degradation (glycolysis). NaOH or NH4OH solutions were used as reaction catalysts. Some physicochemical properties of modified PF resins were determined and their structures have been confirmed using GPC method and IR spectroscopy. The resins contained very low amounts of free formaldehyde (ca. 0.2%) and phenol (1.76-3.75%) whereas dry mass content was in the range 66-80%. Modified resins showed very good thermal stability and the varnish coatings made of them showed good adhesion to metal surface as well as elasticity and impact strength. Application of PET degradation products to PF resins modification creates the possibility of PET wastes utilization and enables to obtain a new kind of resins showing good functional properties.
Keywords: resol phenol-formaldehyde resin, PET chemical degradation, modification, free formaldehyde or phenol content, thermal stability, protective coatings
Effect of resol phenol-formaldehyde resin modification with the products of poly(ethylene terephthalate) chemical degradation on the properties of the resin