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Polymer Blends Based on the beta Modification of Polypropylene

Kállay-Menyhárd, Alfréd and Varga, József and Liber, Á. and Belina, G. (2005) Polymer Blends Based on the beta Modification of Polypropylene. EUROPEAN POLYMER JOURNAL, 41. pp. 669-677. ISSN 0014-3057

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Abstract

iPP/sPP, iPP/rPP, iPP/PVDF and iPP/PA-6 blends, and their b-nucleated forms were prepared in the present study. The components of iPP/sPP and iPP/rPP blends are compatible in the molten state. The phase structure of the melt of iPP/PVDF and iPP/PA-6 blends is heterogeneous. The melting and crystallisation characteristics as well as the structure and polymorphic composition of these blends were studied by polarised light microscopy (PLM) and differential scanning calorimetry (DSC). When semicrystalline polymers are added to iPP, the most important factor of the formation a blend with b-crystalline phase is the a-nucleation effect of the second polymer. In the case of polymers with an a-nucleating effect, the temperature range of their crystallisation should be lower than that of b-iPP. b-nucleated iPP/PVDF and iPP/PA-6 blends are extreme examples showing that completely b-iPP matrix can not form even in the presence of a highly effective b-nucleant, because of the strong a-nucleating ability and higher crystallisation temperature range of PVDF and PA-6. We found that the b-crystallisation tendency of random propylene copolymers can be enhanced by adding an iPP homopolymer.

Item Type: Article
Uncontrolled Keywords: a- and b-forms of isotactic polypropylene; b-nucleating agent; Calorimetry; Polarised light microscopy; Crystallisation; Melting; Polymer blends; Syndiotactic polypropylene; Random propylene copolymer; Poly(vinylidene-fluoride); Transcrystallinity
Subjects: Q Science / természettudomány > QD Chemistry / kémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 05 Mar 2014 10:26
Last Modified: 05 Mar 2014 10:26
URI: http://real.mtak.hu/id/eprint/10671

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