老化对聚氨酯/聚脲涂层结构变化影响的观察

Observation of the Effect of Aging on the Structural Changes of Polyurethane/Polyurea Coatings.

作者信息

Mayer-Trzaskowska Paulina, Robakowska Mariola, Gierz Łukasz, Pach Joanna, Mazur Ewa

机构信息

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.

Department of Polymer, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, 60-965 Poznan, Poland.

出版信息

Polymers (Basel). 2023 Dec 20;16(1):23. doi: 10.3390/polym16010023.

DOI:10.3390/polym16010023

PMID:38201689

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10780686/

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.

摘要

在本研究中，聚氨酯/聚脲涂层经历了四种不同类型的老化：自然环境老化（NC）、加速紫外线老化（UV）、在氯化钠溶液中老化（NaCl）以及热老化（TC）。为监测这些过程中发生的变化，测量了涂层厚度，并持续进行微观和宏观观察。然后，对在各种条件下老化的样品进行光谱（FTIR）和热（TGA）分析，以确定涂层中可能发生的结构变化。通过水接触角和表面自由能，深入研究并表征了老化条件对测试涂层表面物理化学性质的依赖性。在设定的老化期后进行附着力测试。结果表明，不同的老化条件对外观和拉拔强度有巨大影响。在氯化钠溶液中老化的涂层在附着力方面受到的影响更大。