Multi Self-Healable UV Shielding Polyurethane/CeO2 Protective Coating: The Effect of Low-Molecular-Weight Polyols

• Published in: Polymers Vol. 12; no. 9; p. 1947
• Main Authors: Rahman, Mohammad Mizanur, Suleiman, Rami, Zahir, Md. Hasan, Helal, Aasif, Kumar, A. Madhan, Haq, Md. Bashirul
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 28.08.2020; MDPI
• Subjects: Adhesive strength; Adhesives; Carbon; Cerium oxides; coating; Coating effects; Humidity; Metal oxides; Molecular weight; Nanoparticles; Polydimethylsiloxane; Polyesters; Polymerization; Polymers; Polyols; polyurethane; Polyurethane resins; Protective coatings; Self healing materials; self-healing; Shielding; Saudi Arabia
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym12091947

We prepared a series of polyurethane (PU) coatings with defined contents using poly(tetramethylene oxide)glycol (PTMG) with two different molecular weights (i.e., Mn = 2000 and 650), as well as polydimethyl siloxane (PDMS) with a molecular weight of Mn 550. For every coating, maximum adhesive strength and excellent self-healing character (three times) were found using 6.775 mol% mixed with low-molecular-weight-based polyols (PU-11-3-3). Defined 1.0 wt% CeO2 was also used for the PU-11-3-3 coating (i.e., PU-11-3-3-CeO2) to obtain UV shielding properties. Both the in situ polymerization and blending processes were separately applied during the preparation of the PU-11-3-3-CeO2 coating dispersion. The in situ polymerization-based coating (i.e., PU-11-3-3-CeO2-P) showed similar self-healing properties. The PU-11-3-3-CeO2-P coating also showed excellent UV shielding in real outdoor exposure conditions.