Synthesis and characterization of new polyamides derived from 1,3-bis4-(4-aminophenoxy)phenyladamantane

摘要

Several new polyamides were synthesized by direct polycondensation of the 1,3-bis4-(4-aminophenoxy) phenyl adamantane (I) with various dicarboxylic acids. The polyamides had inherent viscosities and number-average molecular weights (M-n) of 0.46-0.96 dL/g and 28,000-109,000, respectively. All polyamides III had good solubilities and were soluble in N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DIMF), and pyridine. Polyamides had tensile strengths of up to 72.3 MPa, elongation to breakage values of up to 10.2, and initial modulus of up to 2.1 GPa. Their glass transition temperatures were found to be 228-269 degrees C and 252-307 degrees C using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA), respectively. The melting temperature of IIIf was observed at 318 degrees C using DSC. The temperatures of polyamides III at a 5 weight loss 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. References: 22