Reactive polyamides from cycloaliphatic C21 dicarboxylic acid and their evaluation as epoxy curing agents

Add time:07/17/2019    Source:sciencedirect.com

Reactive polyamides with amine values ranging from 310 to 389 were prepared by reacting C21 cycloaliphatic dicarboxylic acid, prepared from acrylic acid and dehydrated castor oil fatty acids, with various polyamines, namely diethylenetriamine, triethylenetetramine and tetraethylenepentamine. Some reactive polyamides of matching amine values were also prepared by using C36 dimer acids and tetraethylenepentamine for comparison. The polyamides were then reacted with an epoxy resin (epoxy resin of equivalent weight 450) in different equivalent weight ratios. The cured product obtained by using an equivalent weight ratio of 1.00:1.00 of epoxy resin and reactive polyamide had better binding properties in comparison to other binders. The binders derived from C21 dicarboxylic acid were better than those derived from C36 dimer acids in both adhesion and hardness, and were superior in tensile strength.

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