Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 83: Issue 3
Comparison of different -nucleators for isotactic polypropylene, characterisation by DSC and temperature-modulated DSC (TMDSC) measurements
Authors:
A. Menyhárd Department of Plastic and Rubber Technology Budapest University of Technology and Economics Budapest Hungary P.O. Box 92 1521 Budapest Hungary P.O. Box 92 1521

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J. Varga Department of Plastic and Rubber Technology Budapest University of Technology and Economics Budapest Hungary P.O. Box 92 1521 Budapest Hungary P.O. Box 92 1521

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G. Molnár Department of Plastic and Rubber Technology Budapest University of Technology and Economics Budapest Hungary P.O. Box 92 1521 Budapest Hungary P.O. Box 92 1521

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Pages:
625–630
Online Publication Date:
07 Apr 2006
Publication Date:
12 Mar 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7498-6
Restricted access

Abstract  

The nucleating efficiency and selectivity of different β-nucleating agents was characterised and compared by differential scanning calorimetry, (DSC) and temperature-modulated DSC (TMDSC). The nucleating agents were the calcium salts of pimelic and suberic acid (Ca-pim and Ca-sub), linear trans-γ-quinacridone (LTQ), a commercial nucleator NJ Star (NJS) and an experimental product (CGX-220). The efficiency and the selectivity of Ca-sub and Ca-pim are extremely high. NJS is efficient above a critical concentration, which is connected with its partial dissolution in polypropylene melt. LTQ and CGX-220 possess strong overall nucleating ability and moderate selectivity. Using TMDSC, we found that three consecutive processes take place during the heating of β-nucleated samples cooled down to room temperature: reversible partial melting of the β-form, irreversible βα-recrystallisation, and the melting of the α-modification formed during βα-recrystallisation or being present in samples prepared with non-selective β-nucleators. Melting of the α-phase contains both reversible and irreversible components.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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