Curing studies on epoxy resin with phosphorylated amine*

Abstract

<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">Mechanical properties of an epoxy resin system (neat resin castings) based on diglycidyl ether of bisphenol-A (DGEBA) cured with different amounts of phosphorous based amine, tris(3-aminophenyl) phosphine oxide (TAP) are reported. Influence of stoichiometric imbalance on the thermoelastic properties of the epoxy-amine system is also discussed. Testing of dynamic mechanical properties has been done using Rheovibron DDV-III-EA from ambient temperature to 250 °C. The results show that variation in stoichiometry can affect material properties such as modulus <i>(E</i>_m<i>) </i>and glass transition temperature <span style="mso-bidi-font-style:italic">(<i>T</i>_g<span style="mso-bidi-font-style:italic">)<i>. </i>Various parameters, viz. molecular weight between crosslinks <i>(M</i>_c<i>), </i>apparent front factor (<img src='http://www.niscair.res.in/jinfo/phi.gif' border=0>_a), and crosslink density (ρ_c) have been calculated for all the compositions. Also, the effect of thermal and boiling water ageing on material properties for 100 h are reported.</span></span></span></span></span></span></span></span>