MULTIBLOCK COPOLYMERS CONSISTING OF POLYESTER AND POLYALIPHATIC BLOCKS

Multiblock-(AB)(n)-copolymers, consisting of hard segments of poly(but ylene terephthalate) (PET) and soft segments of dimerized fatty acid w ere synthesized and analysed with DSC and DMTA. The polymers were char acterized by their limiting viscosity number and melt flow index. The glass transition temperature (T-g) and melting temperature (T-m) incre ase with decreasing weight fraction of the dimerized fatty acid and wi th the increase of the crystalline phase content. It was found that th e elasticity (epsilon) depends on the content of dimerized fatty acid in the amorphous phase. Tensile properties were described as a functio n of the degree of polycondensation P-k (molecular weight).