Polymers from renewable resources. XII. Structure property relation in polyamideimides from rosin

Polyamideimides were synthesized from rosin maleic anhydride adduct either by reacting the acid chloride of the latter with different diamines or by self-polycondensation of rosin imido amino acid in the presence of thionyl chloride. The rosin imido amino acids were prepared by condensing rosin-maleic anhydride adduct with diamines. The presence of lithium chloride was found to have pronounced effect on yield and molecular weight of the polymers. The polyamideimides were characterized by infrared, elemental analysis, and viscosity measurements. The polymers were either amorphous or poorly crystalline in nature and soluble only in highly polar solvents. The thermal stability of the polymers has been studied. Some generalizations about structure-property relation in polyamideimides were made.