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Effect of the molecular structure of the polymer and nucleation on the optical properties of polypropylene homo- and copolymers.

Horváth, Zsuzsanna and Menyhárd, Alfréd and Doshev, Petar and Gahleitner, Marcus and Vörös, Gxörgy and Varga, József and Pukánszky, Béla (2014) Effect of the molecular structure of the polymer and nucleation on the optical properties of polypropylene homo- and copolymers. ACS APPLIED MATERIALS AND INTERFACES, 6. pp. 7456-7463. ISSN 1944-8244

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Abstract

Two soluble nucleating agents were used to modify the optical properties of nine PP homo- and random copolymers. The ethylene content of the polymers changed between 0 and 5.3 wt%. Chain regularity was characterized by the stepwise isothermal segregation technique (SIST), while optical properties by the measurement of the haze of injection molded samples. Crystallization and melting characteristics were determined by differential scanning calorimetry (DSC). The analysis of the results proved that lamella thickness and change in crystallinity influence haze only slightly. A model was introduced which describes quantitatively the dependence of nucleation efficiency and haze on the concentration of the nucleating agent. The model assumes that the same factors influence the peak temperature of crystallization and optical properties. The analysis of the results proved that the assumption is valid under the same crystallization conditions. The parameters of the model depend on the molecular architecture of the polymer. Chain regularity determines supermolecular structure and thus the dependence of optical properties on nucleation.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QC Physics / fizika
Q Science / természettudomány > QC Physics / fizika > QC02 Optics / fénytan
Depositing User: Dr. János/J Móczó
Date Deposited: 18 Sep 2014 13:14
Last Modified: 31 Aug 2015 23:15
URI: http://real.mtak.hu/id/eprint/15419

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