SYNTHESIS AND CHARACTERIZATION OF NEW SOLUBLE POLYAMIDES BASED ON TRAMETHYL-2,2-BIS[4-(4-AMINOPHENOXY)PHENYL]PROPANE AND VARIOUS AROMATIC DICARBOXYLIC-ACIDS
Dj. Liaw et By. Liaw, SYNTHESIS AND CHARACTERIZATION OF NEW SOLUBLE POLYAMIDES BASED ON TRAMETHYL-2,2-BIS[4-(4-AMINOPHENOXY)PHENYL]PROPANE AND VARIOUS AROMATIC DICARBOXYLIC-ACIDS, Journal of polymer science. Part A, Polymer chemistry, 36(7), 1998, pp. 1075-1080
A series of new soluble polyamides having isopropylidene-and methyl-su
bstituted arylene ether moieties in the polymer chain were prepared by
the direct polycondensation of 5,5'-tetramethyl-2,2-bis[4-(4-aminophe
noxy)phenyl] propane (TBAPP) and various aromatic dicarboxylic acids i
n N-methyl-2-pyrrolidinone (NMP) using triphenyl phosphite and pyridin
e as condensing agents. Polymers were produced with high yield and mod
erate to high inherent viscosities of 0.87-1.56 dL g(-1). All the poly
mers could be readily dissolved in polar aprotic solvents such as NMP,
N,N-dimethylacetamide and N,N-dimethylformamide, as well as less pola
r solvents such as m-cresol and pyridine. Some of them were even solub
le in tetrahydrofuran. These polymers were solution-cast into transpar
ent, flexible, tough films which were further characterized by x-ray a
nd mechanical analysis. All of the polymers were amorphous and the pol
yamide films had a tensile strength range of 51-100 MPa, an elongation
at break range of 4-11%, and a tensile modulus range of 1.90-2.53 GPa
. These polyamides had glass transition temperatures between 188-255 d
egrees C: and 10% mass loss temperatures in the range of 439-468 and 4
54-483 degrees C in nitrogen and air atmosphere, respectively. (C) 199
8 John Wiley & Sons, Inc.