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M. El Fray, J. Słonecki


The influence of the soft segment chemical structure on some selected properties of thermoplastic multiblock terephthalate copolymers



Polimery 1996, No 4, 214


DOI: dx.doi.org/10.14314/polimery.1996.214

Summary

Thermoplastic elastomers were synthesized and analyzed of the copolyester block copolymers type comprising hard blocks of oligo(tetramethylene terephthalate) and oligoether or dimerized fatty acid soft segments, differing in chemical structure and molecular weight. Oligo(oxyethylene)diol (M = 1000 or 6000), oligo(oxytetramethylene)diol (M = 1000 or 2900), oxyethylated ligo(oxypropylene)diol (M = 1100) or a dimerized fatty acid (M = 570) were used as components of the soft segments. Each copolymer was obtained in a two-stage process involving transesterification and polycondensation in the melt. Elastomer series were prepared with 5—90% soft segments contents. The limiting viscosity number (GLL), equilibrium swelling in benzene (Pbenz), melting point (Tm), glass transition point (Tg), hardness (H), tensile strength (σ r) , relative elongation at break (ε r) and permanent deformation (ε) were determined. The effects of chemical structure, mass content and molecular weight of the soft segments on the above properties were characterized.


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