Abstract
THE valuable properties of phenol-formaldehyde resins have been known for a long time and account for their wide application in the various branches of industry. However, certain shortcomings of these resins necessitate their chemical modification and numerous papers deal with this problem (see e.g. [1]). The purpose of this paper was to obtain a modified novolac resin containing double bonds, owing to which the resin should be made capable of hardening during heating without using additives to promote this process. Thus, with resin hardening according to the polymerization mechanism, separation of low-molecular-weight products can be avoided. These form during hardening by the polycondensation mechanism, disturbing the solid structure and reducing the mechanical strength of specimens. I t can be expected at the same time that shrinkage, during polymerization of such modefied resins, will be very low which is characteristic of the polymerization of oligomers [2]. We modified novolae resin by esterification with acid chloride of methacrylic acid (ACMA) of the phenol hydroxyl resin groups according to the scheme:
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