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SynopsisPolyamideimides 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. EXPERIMENTAL ReagentsRosin used has the following specifications: melting point 56°C; acid number 162.8; specific gravity 1.06. Maleic anhydride (Adarsh Chemicals & Fertilizers Ltd.) was purified by sublimation. Ethylenediamine (SD) and hexamethylenediamine (Fluka) were purified by distillation under reduced pressure ( -20 tom) in nitrogen atmosphere. p-Phenylenediamine (E. Merck), 4,4'-diaminodiphenyl sulfone (Wilson), and 4,4'-diaminodiphenyEmethane (E.

A polyamideimide was synthesized from a rosin‐maleic anhydride adduct in three different ways. The rosin maleic anhydride adduct was condensed with hexamethylenediamine to obtain an amino acid. This amino acid was polymerized either by melt condensation technique or by reacting with thionyl chloride at ambient temperatures to produce a polyamideimide. Polyamideimide from rosin may also be prepared by reacting acid chloride of rosin‐maleic anhydride with hexamethylenediamine. The polymer was characterized by IR and elemental analysis. The polymer was found to be soluble only in highly polar solvents such as dimethyl formamide, dimethyl sulfoxide, m‐cresol etc. The thermal stability of the polymer has been studied.

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