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A.Kozłowska, J. Słonecki



Segmented block copolymers based on oligoamides of dimerized fatty acid and poly(butylene terephthalate).

RAPID COMMUNICATION (in English)

Polimery 1998, No 3, 188


DOI: dx.doi.org/10.14314/polimery.1998.188


Summary

Segmented multiblock copolymers based on poly(butylene terephthalate) and oligoamide were synthesized in the melt. Pripol 1009, a dimerized fatty acid ( M @ 575 g/mol), was coupled with 1,6-hexamethylene diamine or with bis-(3 aminopropyl)-polytetrahydrofuran to synthesize lowmolecular-weight oligoamides. The soft segment contents in the copolymers series obtained, ranged from 0 to 80% by wt. Therrrial transitions in the oligomers prepared, studied by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA), showed the glass transition temperature (Tg) and the melting point (Tm) to increase as the oligomer weight fraction was decreased and the crystalline content increased. Tensile properties (storage modulus, loss angle) were found to be related to the oligoamide content in the amorphous phase. DSC and DTMA showed the copolymers to behave as typical thermoplastic elastomers.


Keywords: segmented block copolymers, thermoplastic elastomers, synthesis, DSC and DMTA studies


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