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2020 (2) 5

https://doi.org/10.15407/polymerj.42.02.114

INFLUENCE OF PHASE INVERSION IN A FILLED POLYMER BLEND ON THE SURFACE AND THERMAL CHARACTERISTICS OF THE COMPOSITE

A.I. Misiura, Taras Shevchenko National University of Kyiv, 4, Hlushkovа prospekt, Kyiv, 03022, Ukraine. e-mail: andrii_misiura@ukr.net

ORCID: 0000-0001-9918-1670

Ye.P. Mamunya, Institute of macromolecular chemistry of NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine, e-mail: ymamunya@ukr.net

ORCID: 0000-0003-3855-2786

I.M. Parashchenko, Institute of macromolecular chemistry of NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

ORCID: 0000-0002-9797-6530

N.P. Kulish, Taras Shevchenko National University of Kyiv, 4, Hlushkovа prospekt, Kyiv, 03022, Ukraine

ORCID: 0000-0002-7409-8560

Polym. J., 2020, 42, no. 2: 114-124.

Section: Physics of polymers.

 

Language: Ukrainian.

Abstract:

The morphological features, surface and thermal characteristics of the PP/СPA-Fe composite based on a blend of the thermoplastic polymers polypropylene (PP) and copolyamide (CPA) are described. The filler was localized only in the CPA phase due to the method of the composite preparation, as well as the influence of the thermodynamic and kinetic factors. Three different types of the PP/CPA-Fe composite morphology in whole concentration range were observed. Up to 7 vol.% Fe, PP phase is the matrix of composite and phase CPA-Fe is the inclusions. In the range of 7-20 vol.% the phase inversion region observed, where the phases PP and CPA-Fe are co-continuous. When the concentration of the filler more than 20 vol.% the CPA-Fe phase becomes the matrix of composite and the PP phase is the inclusions. The phase inversion region observed in the range of 7-20 vol.%, where the PP and CPA-Fe phases are co-continuous. Based on the values of the contact angle between the testing liquids and the surface of the composite, as well as Owens and Wendt’s method, the surface energy of the composite and its dispersion and polar components were calculated. It was found that the largest changes in the value of surface energy and its components occur in the phase inversion region, at the same time, in the concentration intervals of 0-7 vol.% and 20-40 vol.%, the change in surface energy values is insignificant. The curves of differential scanning calorimetry (DSC) and differential thermomechanical analysis (DTMA) have two melting peaks, which corresponds to the PP and CPA phases, and their intensity depends on the composition of the blend. An increase in the CPA melting temperature was also found, that is due to the occurrence of excessive pressure, which is 45 MPa, because of the restriction of the thermal expansion of the CPA melt by the solid PP phase.

 

Key words: filled polymer blend, phase inversion region, surface energy, thermal characteristics.

 

 

 

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