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Calorimetric and dielectric study on poly(trimethylene terephthalate)/polycarbonate blends

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Abstract

Poly(trimethylene terephthalate) (PTT)/polycarbonate (PC) blends with different compositions were prepared by melt blending. The miscibility and phase behavior of melt-quenched and cold-crystallized blends were studied using differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy. The blends of all compositions display only one glass transition (T g ) in both states. The melting temperature and the crystallinity of PTT in the blend decrease with increasing PC content. The dielectric results for the melt-quenched blends, for PC content up to 60 wt.%, exhibited two merged relaxation peaks during the heating scan; the lower temperature relaxation peak represent the normal glass-transition (α) relaxation of the mixed amorphous phase and the higher temperature relaxation due to the new-constrained mixed amorphous phase after crystallization. Cold-crystallized blends displayed only one glass transition α-relaxation whose temperatures varied with composition in manner similar to that observed by DSC. The dielectric α-relaxation of cold crystallized blends has been analyzed. Parameters relating to relaxation broadening, dielectric relaxation strength, and activation energy were quantified and were found to be composition dependent. The PTT/PC blends could be considered as two-phase system, a crystalline PTT phase and a mixed amorphous phase consisting of a miscible mixture of the two polymers. However, the crystallinity was only detected for blends containing greater than 40 wt.% PTT.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Cairo University, 12613, Giza, Egypt

    E. El Shafee, G. R. Saad & M. Zaki

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  1. E. El Shafee
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  2. G. R. Saad
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  3. M. Zaki
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Correspondence to E. El Shafee.

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El Shafee, E., Saad, G.R. & Zaki, M. Calorimetric and dielectric study on poly(trimethylene terephthalate)/polycarbonate blends. J Polym Res 15, 47–58 (2008). https://doi.org/10.1007/s10965-007-9143-5

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  • DOI: https://doi.org/10.1007/s10965-007-9143-5

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