Title: INFLUENCE OF EPOXY NATURE ON THE PROPERTIES OF AN EPOXY-DIALLYLBISPHENOL A-BISMALEIMIDE MATRIX SYSTEM
Page Range: p.447-455
Author(s): Devi K A; Nair C P R; Sadhana R; Ninan K N
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.7
Abstract
The effects were examined of variations in the structure of the epoxy resin on the thermal, physical, and mechanical properties of ternary blends of an epoxy resin, diallylbisphenol A, and bisphenol A bismaleimide (EPB). Three epoxy resin systems were examined: a novolac epoxy (E1), bisphenol A diglycidyl ether (E2), and tris(4-glycidyloxyphenyl)methane) (E3). The cure characteristics of the reactive blends were examined by means of IR spectroscopy, differential scanning calorimetry, and rheological analysis. The thermal stability of the blends in terms of the onset temperature for decomposition increased in the order EPB-E3, EPB-E1 and EPB-E2. The compressive, flexural, and interlaminar shear strength properties of glass composites based on the EPB matrices depended on the epoxy structure. The higher crosslink density of the trifunctional epoxy (E3) resulted in an improvement in the high-temperature properties of the system. The ternary system served as a very good adhesive, and its strength and retention at high temperature increased in proportion to the functionality of the resin. In general, the highest strength was obtained with systems containing the novolac epoxy. 12 refs.
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