Structure of Ba, Sr, Ca AND Mg pimelates and their nucleating ability in polypropylene melt

Janevski, Aco and Bogoeva-Gaceva, Gordana and Stefov, Viktor and Najdoski, Metodija (2014) Structure of Ba, Sr, Ca AND Mg pimelates and their nucleating ability in polypropylene melt. In: 23 rd Congress of Chemists and Technologist of Macedonia, 8-11 Oct 2014, Ohrid, Macedonia.

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Abstract

The pimelates of the eart-alkaline elements and pimelic acid have been synthesized and studied. All prepared pimelates are crystallohydrates and Ba and Sr pimelate are isomorphous. The obtained compounds have been characterized using FIR and Raman spectroscopy and X-ray diffraction and it was found that, at the melt temperature of polypropylene, the pimelates of Ba and Sr are crystalline whereas the ones of Ca and Mg are amorphous. The nucleation activity of these pimelates have been studied in the process of crystallization of polypropylene in non-isothermal conditions and followed by differential scanning calorimetry (at rate of crystallization Vc= 1-20 K/min). It was found that their nucleation activity, even at concentration of 0.1 %, differs considerably with regards to the crystallization rate, and they induce different polymorphic composition of the polymer. The nucleation activity was mostly exhibited by Ca pimelate, and when it was used the content of the β crystalline phase (Uβ) in polyprolylene ranged from 0.90 to 0.94, depending on the crystallization rate, compared to 0.18-0.35 when Mg pimelate was used. In the polymer obtained by using Ba and Sr pimelate, Uβ ranged from 0.47 to 0.77. Based on the structures of the pimelates and the theoretical concepts for nucleation activity of solid substrates, an attempt was made to correlate the obtained activity to the structural parameters of the obtained polymer.

Item Type: Conference or Workshop Item (Poster)
Subjects: Natural sciences > Chemical sciences
Natural sciences > Other natural sciences
Divisions: Faculty of Technology
Depositing User: Aco Janevski
Date Deposited: 26 Nov 2014 10:00
Last Modified: 26 Nov 2014 10:00
URI: http://eprints.ugd.edu.mk/id/eprint/11443

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