A new block terpolymer of poly(tetramethylene terephthalate)-block-poly(oxy
tetramethylene)block-polydodecanelactam with potential application as elast
omers have been obtained by melt polycondensation of alpha,omega-dihydroxyp
oly(butylene terephthalate), alpha,omega-dihydroxypoly(oxytetramethylene) (
M-n approximate to 1000) and alpha,omega-dicarboxyoligo(dodecanelactam) (M-
n approximate to 2000). The synthesis and some physical and chemical proper
ties of this block poly(ester-ether-amide) thermoplastic elastomer is prese
nted. A variety of different methods was used to study the phase structure,
thermal and relaxational properties.