Preparation and some properties of multiblock copoly(ester-amides) (KPEA) containing oligo(tetramethylene terephthalate) hard segments and oligoamide soft segments
Polimery 1996, No 6, 344
Dimerized fatty acids have been polycondensed with 1,6-hexamethylene diamine to yield a series of oligodicarboxamides (PA 36.6) of different molecular weights. Further polycondensation of these oligoamides with oligo(tetramethylene terephthalate)(PTMT) (prepared from 1,4-butanediol and dimethyl terephthalate) gave copoly(ester-amide) (KPEA) differing in the molecular weights hard of soft segments. Each KPEA had an identical mass ratio of 1:1 of the two types of segments. KPEA properties, viz., intrinsic viscosity, equilibrium swelling in benzene, melting point, glass transition temperature and degree of crystallinity, were studied in relation to oligoamide molecular weight by using DSC, DMTA and like methods. Mechanical (tensile) properties of KPEA were examined.
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