SYNTHESIS AND PROPERTIES OF SIMULTANEOUS INTERPENETRATING NETWORKS BASED ON POLY(URETHANE-EPOXY) ALLYL NOVOLAC RESIN/

Poly (urethane-epoxy)/allyl novolac resin simultaneous interpenetratin g networks (SINs) were prepared by crosslinking urethane-epoxy adduct with diamino diphenylmethane (DDM) and allyl novolac resin simultaneou sly. An urethane-epoxy adduct was synthesized by terminating the ureth ane prepolymer composed of 4,4'-diphenyl methane diisocyanate (MDI) an d poly (tetramethylene oxide) (PTMO), whose molecular weight range fal ls in 600-700 (UT1), 900-1050 (UT2) and 1900-2100 (UT3) with glycidol (GL). The allyl novolac resin was derived from novolac type phenolic r esin by substituting the hydroxy group on the aromatic ring with the a llyl group. The thermal, mechanical and dynamical characteristics of t hese SINs were measured by differential scanning calorimetry (DSC), In stron tester and dynamical mechanical analysis (DMA), and correlated w ell enough with morphological observations from transmission electron microscopy (TEM). All these SINs exhibit a two-phase structure and a r easonable explanation is provided for the correspondence of the phase mixing and the specific mechanical properties.