Publication detail

Possibilities of influencing the crystallization process of bisphenol A- and bisphenol F-based epoxy resins used for hydrophobic coatings on concrete

SEIDLOVÁ, M. HODUL, J. BORG, R. ŽIŽKOVÁ, N.

Original Title

Possibilities of influencing the crystallization process of bisphenol A- and bisphenol F-based epoxy resins used for hydrophobic coatings on concrete

Type

journal article in Web of Science

Language

English

Original Abstract

Crystallization of bisphenol A (DGEBA)- and bisphenol F (DGEBF)-based epoxy resins is a natural property of these oligomers. However, manufacturers of coatings and other systems based on these epoxy resins are making efforts to slow down the crystallization process as much as possible, thereby extending the shelf life and improving the competitiveness of their products. This paper focuses on the kinetics of the crystallization process of epoxy resins and the effect of the presence of a certain degree of crystallinity on selected parameters of epoxy-based materials. Furthermore, an analysis of the impact of a certain degree of crystallinity of the epoxy base on the resulting coating parameters was carried out. The highest value of crystallinity (17%) was achieved in the sample containing the highest proportion of DGEBF in the crystallization phase “c”, and the enthalpy of melting (Ht) of the crystalline DGEBF sample was 6.3 J/g. Mechanical parameters as well as chemical and thermal resistance of hydrophobic epoxy systems were investigated. The best abrasion resistance (1.5 cm3/50 cm2) was achieved with the blend containing only amorphous DGEBA. The adhesion of the epoxy samples on concrete was greater than 6.5 MPa. The chemical resistance tests performed showed that, in general, the chemical resistance of epoxy systems decreases with increasing crystallinity content. The tighter arrangement of molecules in the crystalline regions of the epoxy matrix results in an increase in density, strength and hardness. This study presents a comprehensive examination of the crystallization of DGEBA and DGEBF, which is, as yet virtually unavailable. It also contributes to knowledge by outlining the possibility of speeding up or slowing down the crystallization process of epoxy resins, including the principle of selecting nucleating agents.

Keywords

epoxy resin; crystallization; coatings; mechanical parameters; glass transition temperature; bisphenol; chemical resistance

Authors

SEIDLOVÁ, M.; HODUL, J.; BORG, R.; ŽIŽKOVÁ, N.

Released

24. 9. 2023

Publisher

MDPI

ISBN

2073-4360

Periodical

Polymers

Year of study

15

Number

19

State

Swiss Confederation

Pages from

1

Pages to

24

Pages count

24

URL

https://www.mdpi.com/2073-4360/15/19/3871

Full text in the Digital Library

http://hdl.handle.net/11012/244173

BibTex

@article{BUT184817,
  author="Michaela {Seidlová} and Jakub {Hodul} and Nikol {Žižková} and Ruben Paul {Borg}",
  title="Possibilities of influencing the crystallization process of bisphenol A- and bisphenol F-based epoxy resins used for hydrophobic coatings on concrete",
  journal="Polymers",
  year="2023",
  volume="15",
  number="19",
  pages="24",
  doi="10.3390/polym15193871",
  issn="2073-4360",
  url="https://www.mdpi.com/2073-4360/15/19/3871"
}