Researches on the Hardening Reaction of Phenol Novolac

VII. On the Flow Property of Heated Resin

Abstract

Mixtures of phenol novolac and hexamine were heated and their flow property and solubility in ethanol were measured. The following facts were found in this experiment: The heated resin had some Newtonian flow under the condition of high temperature and high pressure, even when some insoluble resin was formed in it, therefore its absolute viscosity was able to be measured. The viscosity of the heated resin was almost constant before an insoluble resin was formed in it, but the value of viscosity increased as the amount of insoluble resin increased. The soluble resin contained in the heated resin had almost the same flow property at any heating condition, and the value of flow was almost equal to phenol novolac which was not heated, but the insoluble resin in it did not flow, being independent of any heating condition, even at high temperature and high pressure.