Effect of unsaturated acids on the properties of epoxy resins: Synthesis and characterization

Abstract

<span style="font-size:11.0pt;font-family:" calibri","sans-serif";="" mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"times="" new="" roman";="" mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The effect of unsaturated aliphatic and aromatic acids such as acrylic acid and cinnamic acid on the properties of epoxy resins has been studied by synthesizing related resins in their presence at 110±2^oC. These resins have been characterized by IR, ¹HNMR, spectroscopy by the thermal analysis. The reaction follows first order kinetics with activation energy 53 and 92 kJ mol^-1 for resins containing cinnamic acid and acrylic acid, respectively. The characteristic value, such as epoxide equivalent, specific viscosity increased in the presence of acids due to formation of <span style="font-size:11.0pt;font-family:" calibri","sans-serif";="" mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"times="" new="" roman";="" mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin;="" mso-bidi-theme-font:minor-latin;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">β<span style="font-size:11.0pt; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">-hydroxy ester of diglycidal ether of bisphenol A. However, the hydroxyl content and hydrolyzable chlorine content decreased due to formation of diester of propanol 2 and poly (acryloyl-chloride).</span></span></span>