D. Liaw, Been-Yang Liaw
Aug 1, 1997
Citations
0
Influential Citations
23
Citations
Journal
Macromolecular Symposia
Abstract
1,4-Bis(4-aminophenoxy)-2-tert-butylbenzene was synthesized and used as a monomer to prepare a series of polyamides by the direct polycondensation with various aromatic dicarboxylic acids in N-methyl-2-pyrrolidone using triphenyl phosphite and pyridine as condensing agents. All the polymers were obtained in quantitative yields with inherent viscosities of 0.75 1.75 dL g -1 . All the polyamides showed amorphous nature and most of them were soluble in polar solvents. Polyamides derived from 4,4'-sulfonyldibenzoic acid and 4,4'-hexafluoroisopropylidenedibenzoic acid were even soluble in common organic solvent such as THF. All polyamide films could be obtained by casting from their DMAc or NMP solutions. The polyamide films had a tensile strength range of 35 84 MPa, an elongation range at break of 3 - 7 %, and a tensile modulus range of 1.2 - 2.5 GPa. These polyamides had glass transition temperatures between 203 268 °C and 10 % mass loss temperatures were recorded in the range of 456 - 472 °C in nitrogen and 453-470 °C in air atmosphere.