Synthesis and characterization of elastomers based on poly(terephthalate-co-carbonate)s
The molten-state polycondensation of dimethylterephthalate with 1,4-butanediol and an oligocarbonate diol resulted in (A B )n-type copolyesters comprising blocks of poly(ethylene terephthalate) and blocks of polycarbonate. These products, comprising 20—50% weight oligocarbonate segments of molecular mass in the range of 600—1500, have been characterized by viscometry and DSC method. Their hardness, elasticity, tensile strenght and elongation at break have also been determined. Copolyesters with aiphatic oligocarbonate segments revealed multiphase structure and properties of hermoplaslic elastomers. Poly(terphthalate-co-carbonate) comprising cycloatliphatic oligocarbonate is a rigid, transparent product of single-phase structure.
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