Epoxy resin/poly(ethylene oxide)(PEO) and poly(epsilon-caprolactone)(PCL) blends cured with 1,3,5-trihydroxybenzene:miscibility and intermolecular interactions

摘要

Epoxy resin(ER)/poly(ethylene oxide)(PEO)and/or poly(epsilon-caprolactone)(PCL) blends cured with 1,3,5-trihydroxybenzene (THB) were prepared via the in situ curing reaction of epoxy monomers in the presence of PEO and/or PCL,which started from the initially homogeneous mixtures of DGEBA,THB and PEO and/or PCL.The miscibility and the intermolecular specfic interactions in the thermosetting polymer blends were investigated by means of differential scanning calorimetry (DSC) adn Fourier transform infrared spectroscopy(FTIR).The two systems displayed single and composition-dependant glass transition temperatures(T_gS_,indicatin gth efull miscibility of the thermosetting blends.the experimental T_gS fo the blends.The experimental T_gS of the blends can be well accounted for by Gordon-Taylor and kwei equations,respectively.The T_g-composition behaviors were compared with those of poly(hydroxyether of bisphnoloA) (Phenoxy)blends with PEO and PCL.it is noted that the formation of crosslinked structure has quite different effects on miscibility and intermolecular hydrogen bonding interactions for the thermosetting polymer blends.In ER/PEO blends,the strength of the intermolecular hydrogen bonding interactions is weaker than that of the self-association in the control epoxy resin,which is in marked contrast to the case of Phenoxy/PEO blends.This suggests that th ecrosslinking reduces the intermolecular hydrogen binging interactions,whereas the intermolecular hydrogen bonding interactions were not significantly crosslinking structure in ER/PCL blends.