SYNTHESIS AND CHARACTERIZATION OF NEW POLYAMIDES DERIVED FROM 1,3-BIS[4-(4-AMINOPHENOXY)PHENYL]ADAMANTANE

Several new polyamides were synthesized by direct polycondensation of the 1,3-bis[4-(4-aminophenoxy) phenyl] adamantane (I) with various dic arboxylic acids. The polyamides had inherent viscosities and number-av erage molecular weights (M-n) of 0.46-0.96 dL/g and 28,000-109,000, re spectively. All polyamides III had good solubilities and were soluble in N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), N,N-dim ethylformamide (DIMF), and pyridine. Polyamides had tensile strengths of up to 72.3 MPa, elongation to breakage values of up to 10.2%, and i nitial modulus of up to 2.1 GPa. Their glass transition temperatures w ere found to be 228-269 degrees C and 252-307 degrees C using differen tial scanning calorimetry (DSC) and dynamic mechanical analysis (DMA), respectively. The melting temperature of IIIf was observed at 318 deg rees C using DSC. The temperatures of polyamides III at a 5% weight lo ss ranged from 395 to 435 degrees C in air and from 400 to 450 degrees C in a N-2 atmosphere. (C) 1998 John Wiley & Sons, Inc.