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  • 1 MCS University Department of Polymer Chemistry, Faculty of Chemistry Gliniana 33 Street 20-614 Lublin Poland
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Abstract

The cure reaction of NADIC/PA modified unsaturated (epoxy) polyesters with styrene initiated by benzoyl peroxide (BPO) or the mixture of benzoyl peroxide/tetrahydrophthalic anhydride (BPO/THPA) and the thermal properties of obtained styrene copolymers have been studied. Based on non-isothermal DSC analysis, it was proved that the course of the cure reaction clearly depended on the structure of polyesters as well as used curing agent. Generally, one or two asymmetrical peaks for the cure reaction of NADIC/PA modified unsaturated epoxy polyesters with styrene were observed. They were attributed to the copolymerization process of carbon–carbon double bonds of polyester and styrene and/or to the thermal curing of epoxy groups or polyaddition reaction of epoxy groups to anhydride groups, in dependence of used hardener. In addition, only one asymmetrical peak connected with the copolymerization process for the cure reaction of NADIC/PA modified unsaturated polyesters and styrene was observed. Moreover, the cure process of NADIC/PA modified unsaturated epoxy polyesters with styrene initiated with BPO/THPA was more exothermic (higher values of ΔH) compared to the cure process initiated only with BPO.

The obtained styrene copolymers based on NADIC/PA modified unsaturated epoxy polyesters were characterized by better thermal properties compared to copolymers based on NADIC/PA modified unsaturated polyesters. It has manifested by higher E′20 °C, E″max, tgδmax, Tg as well as higher IDT, T10%, T20%, T50% and Tk temperatures. Moreover, the introduction of non-polymerizable cycloaliphatic anhydride (NADIC anhydride) into unsaturated (epoxy) polyester structure caused improvement of the thermal properties of cured copolymers compared to copolymers based on non-polymerizable, aromatic (PA) modified unsaturated (epoxy) polyesters.

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  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
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)