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The Effect of HAP Modification on the Structure and Thermal Properties of Segmented Terpoly(ester-ether-ester)s (TEEEs)

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Abstract:

New organic/inorganic hybrid materials prepared from multiblock terpolymer as a polymeric matrix containing phthalic acid segments (PBT) as a hard block, hydrogenated dimer fatty acid (DLA) as a hydrophobic soft block and poly(ethylene glycol) (PEG) as a second soft block of a hydrophilic nature are presented in this work. Two types of nanocrystalline hydroxyapatites (non-calcined, HAP I, and sintered, HAP III) were used in an amount of 0.5 wt% as an inorganic phase within the hydrophilic/hydrophobic multiblock terpolymer matrix. DSC investigations revealed a two-phase structure of TEEE with a low-temperature glass transition ascribed to the amorphous phase of the soft segments (DLA and PEG) and a high-temperature melting point ascribed to the crystalline phase of PBT. The chemical structure and thermal properties of organic/inorganic composite (hybrid) materials were strongly dependent on the type of HAP: an increased glass transition temperature (Tg) and crystallization temperature (Tc) were found for composites containing sintered HAP III, while non-calcined HAP I had no influence on Tg and Tc as compared with the neat TEEE.

Tags: polyesters, crystallization, hydroxyapatite, composites.

Published in issue no 6 (71) / 2008, pages 77–80.

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