The phase structure and relaxation phenomena in blends of a poly(ether-ester) elastomer with a liquid crystalline polyester

J. Majszczyk; Z. Rosłaniec; D. Pietkiewicz; T. Pakuła

Published : 2022-09-18

Vol. 47 No. 1 (2002)

The phase structure and relaxation phenomena in blends of a poly(ether-ester) elastomer with a liquid crystalline polyester

J. Majszczyk Z. Rosłaniec D. Pietkiewicz T. Pakuła

Abstract

Poly(ether-ester) (PEE) Elitel 4450 - liquid crystalline polyester (LCP) Vectra RD 501 blends extruded (L/D = 20, D = 19mm) with a homogenizing head at 225degreesC, were studied by differential scanning calorimetry (DSC), dynamical mechanical thermal analysis (DMTA), dielectric spectroscopy, and scanning electron microscopy (SEM). The blends exhibited a multiphase microstructure. Two mechanical relaxation temperatures were found to occur, and similarly two glass transition temperatures were recorded by DSC. There is a glass transition in the PTMO soft phase (ca. - 60degreesC) and in Vectra (+ 107degreesC). For the PBT hard phase (ca. +35degreesC), T-g2, is weakly pronounced because of the high crystallinity. The blend showed only one m.p., close to the m.p. of the PEE. Three dielectric relaxation processes were found to occur in PEE and three others in Vectra. In the blends, the dielectric spectra are seen to be superimposed. These blends are immiscible in terms of thermodynamics. Vectra modified the molecular mobility of the PEE rigid segments, as evident from nonisothermal crystallization of the PBT hard phase and degree of crystallinity as also from changes of the PTMO content in the soft phase. SEM disclosed either a spherical or a fibrousstructure in the blends, depending on Vectra content.

Keywords

mieszaniny polimerów ; blokowy kopoli(etero/ester) ; poliester Vectra ciekłokrystaliczny ; wzajemna mieszalność ; struktura fazowa ; przemiany fazowe block copoly(ether-ester) ; liquid crystalline polyester ; polymer blends ; Elitel4450—Vectra RD 501 blends ; phase structure ; physical properties ; relaxation phenomena ; molecular mobility

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Majszczyk, J., Rosłaniec, Z., Pietkiewicz, D., & Pakuła, T. (2022). The phase structure and relaxation phenomena in blends of a poly(ether-ester) elastomer with a liquid crystalline polyester. Polimery, 47(1), 34–42. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1941

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J. Majszczyk polimery@ichp.pl

Affiliation
Technical University of Szczecin, Institute of Physics, Piastow 17, PL-70310 Szczecin, Poland

Z. Rosłaniec

D. Pietkiewicz

T. Pakuła