THERMAL DEGRADATION OF PHENOLIC RESINS .6.

Thermogravimetric studies have been made of the stabilities of resins made from diphenylolpropane and formaldehyde. It was confirmed that these resins are less thermally stable than phenol formaldehyde resins. When the aliphatic hydrogen atoms of diphenylolpropane are entirely substituted by fluorine atoms, stability of the resins formed with formaldehyde is sharply enhanced but the carbon residue is similar to unsubstituted bisphenol resins. When the central group of the diphenylol derivative was tetrafluorodichloropropylidene, the resulting resin was less stable. It was found that the addition of polytetrafluorethylene to phenolic resins inhibited degradation to a significant extent. © 1969.