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Effects of Network Segment Structure on the Phase Homogeneity of Crosslinked Poly(ethylene Oxide)/epoxy Networks by Tah Jou Horng; Eamor M. Woo is a Materials Science article available to read on EtoBox.

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Differential scanning calorimetry (d.s.c.), optical microscopy and scanning electron microscopy (OM and SEM), and Fourier Transform infrared (FTi.r.) studies have been performed to demonstrate several cases of cured poly(ethylene oxide)/(diglycidylether of bisphenol-A) epoxy networks. To evaluate effects of structural change of the crosslinked epoxy segments on the morphology of polymer/epoxy networks, three different types of hardening agents were used. An interesting miscible phase was observed in aromatic amine-cured PEO/DGEBA and anhydride-cured PEO/DGEBA. Structurally, it can be viewed that the PEO chains interpenetrate with entanglement into the crosslinked epoxy network. Thermodynamically, the glass transition results indicate that the PEO chains also intimately mingle with the epoxy-DDS network chain segments to achieve a homogeneous solid state. By comparison, aliphatic amine curing led to phase separation. Apparently, different structure of hardeners led to different chain segments of cured epoxy, which in turn could influence the ultimate phase morphology of cured PEO/epoxy solids. For the miscible polymer/epoxy networks, the cure temperature (thus cure kinetic rate) was

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Author

Tah Jou Horng; Eamor M. Woo

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)