Fp. Glatz et R. Mulhaupt, SYNTHESES AND THERMAL-PROPERTIES OF AROMATIC AND SEMIAROMATIC POLYTHIOETHERAMIDES CONTAINING OLIGO(THIO-1,4-PHENYLENE) SEGMENTS, Polymer bulletin, 31(2), 1993, pp. 129-136
A family of aromatic and semi-aromatic polythioetheramides was prepare
d from well-defined diamine-terminated oligo(thio-1,4-phenylene)s (PPS
-DA) containing n=1,2,3,4,5,6 thio-1,4-phenylene units. Polycondensati
on reactions with adipic, sebacic, terephthalic and isophthalic acid c
hlorides were carried out in N-methyl-2-pyrrolidone solution at room t
emperature to yield amorphous and semi-crystalline polythioetheramides
. The influence of the oligo(thio-1,4-phenylene) segment lengths on ph
ase transitions and thermal degradation of the polythioetheramides was
investigated. As a function of the PPS segment lengths, glass transit
ion temperatures vary between 120-degrees-C and 300-degrees-C, and mel
ting temperatures between 290-degrees-C and 500-degrees-C. The thermal
stabilities determined by thermogravimetric analysis under nitrogen i
ncrease with increasing PPS segment lengths. In the case of the higher
molecular weight PPS segments, the resulting semi-aromatic polyamides
exhibit two crystalline phase transitions.