Abstract.
Epoxy resin (ER)/poly(ethylene oxide) (PEO) and/or poly(ε-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 specific interactions in the thermosetting polymer blends were investigated by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). The two systems displayed single and composition-dependant glass transition temperatures (Tgs), indicating the full miscibility of the thermosetting blends. The experimental Tgs of the blends can be well accounted for by Gordon-Taylor and Kwei equations, respectively. The Tg-composition behaviors were compared with those of poly(hydroxyether of bisphnol A) (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 the crosslinking reduces the intermolecular hydrogen bonding interactions, whereas the intermolecular hydrogen bonding interactions were not significantly reduced by the formation of the crosslinking structure in ER/PCL blends.
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Acknowledgement.
The author (S. Zheng) would like to acknowledge the Excellent Young Teachers Program (EYTP, project No. 2066) of Ministry of Education, P. R. China for the financial support. The author (Q. Guo) wishes to express his appreciation to the Natural Science Foundation of China for the award to Outstanding Young Scientists (No. 59525307).
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Zheng, S., Lü, H., Chen, C. et al. Epoxy resin/poly(ethylene oxide) (PEO) and poly(ε-caprolactone) (PCL) blends cured with 1,3,5-trihydroxybenzene: miscibility and intermolecular interactions. Colloid Polym Sci 281, 1015–1024 (2003). https://doi.org/10.1007/s00396-003-0870-9
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DOI: https://doi.org/10.1007/s00396-003-0870-9