Synthesis and properties of simultaneous interpenetrating networks based on poly(urethane-epoxy)/allyl novolac resin |
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Authors: | Wen-Yen Chiang Dong-Meau Chang |
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Affiliation: | (1) Department of Chemical Engineering, Tatung Institute of Technology, 40 Chungshan North Road, 3rd Sec, Taipei, 10451, Taiwan Republic of China |
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Abstract: | Poly (urethane-epoxy)/allyl novolac resin simultaneous interpenetrating networks (SINs) were prepared by crosslinking urethane-epoxy
adduct with diamino diphenylmethane (DDM) and allyl novolac resin simultaneously. An urethane-epoxy adduct was synthesized
by terminating the urethane prepolymer composed of 4,4′-diphenyl methane diisocyanate (MDI) and poly (tetramethylene oxide)
(PTMO), whose molecular weight range falls in 600–700 (UT1), 900–1050 (UT2) and 1900–2100 (UT3) with glycidol (GL). The allyl
novolac resin was derived from novolac type phenolic resin by substituting the hydroxy group on the aromatic ring with the
allyl group. The thermal, mechanical and dynamical characteristics of these SINs were measured by differential scanning calorimetry
(DSC), Instron tester and dynamical mechanical analysis (DMA), and correlated well enough with morphological observations
from transmission electron microscopy (TEM). All these SINs exhibit a two-phase structure and a reasonable explanation is
provided for the correspondence of the phase mixing and the specific mechanical properties.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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