Abstract
Glass transition temperatures of some semi-interpenetrating polymer networks based on aromatic polyurethane and cross-linked epoxy resin were determined by differential scanning calorimetry. The influence of increasing epoxy network content on the glass transition temperatures was studied. Absolute heat capacities and cross-linking densities were determined. It was observed that the glass transition temperatures increased with increasing epoxy resin content until phase separation. Miscibility studies were conducted by applying Fox and Gordon–Taylor equations. Morphological studies were conducted by optical microscopy and scanning electron microscopy.
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