학술논문
Observation of the Effect of Aging on the Structural Changes of Polyurethane/Polyurea Coatings.
Document Type
Academic Journal
Author
Mayer-Trzaskowska P; Department of Light Elements Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Foundry and Automation, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.; Robakowska M; Department of Polymer, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland.; Gierz Ł; Faculty of Mechanical Engineering, Institute of Machine Design, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland.; Pach J; Department of Light Elements Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Foundry and Automation, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.; Mazur E; Department of Light Elements Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Foundry and Automation, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.
Source
Publisher: MDPI Country of Publication: Switzerland NLM ID: 101545357 Publication Model: Electronic Cited Medium: Internet ISSN: 2073-4360 (Electronic) Linking ISSN: 20734360 NLM ISO Abbreviation: Polymers (Basel) Subsets: PubMed not MEDLINE
Subject
Language
English
Abstract
In this study, polyurethane/polyurea coatings were exposed to four different types of aging: aging in the natural environment (NC), accelerated ultraviolet aging (UV), aging in a sodium chloride solution (NaCl), and thermal aging (TC). To monitor the changes that occurred during these processes, the thickness was measured and microscopic and macroscopic observations were conducted continuously. The samples aged under various conditions were then subjected to spectroscopic (FTIR) and thermal (TGA) analysis to determine the possible structural changes in the coatings. The dependence of aging conditions on the physicochemical properties of the tested coating surfaces was thoroughly investigated and characterized by the water contact angle and surface free energy. Adhesion tests were performed after the established aging period. The results show that different aging conditions have a tremendous effect on the appearance and pull-off strength. The coatings that age in a NaCl solution are more affected in terms of their adhesion.