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

Mohammad Mizanur Rahman; Rami Suleiman; Md Hasan Zahir; Aasif Helal; A Madhan Kumar; Md Bashirul Haq

doi:10.3390/polym12091947

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

Polymers (Basel). 2020 Aug 28;12(9):1947. doi: 10.3390/polym12091947.

Authors

Mohammad Mizanur Rahman¹, Rami Suleiman¹, Md Hasan Zahir², Aasif Helal³, A Madhan Kumar¹, Md Bashirul Haq⁴

Affiliations

¹ Center of Research Excellence in Corrosion, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
² Center of Research Excellence in Renewable Energy, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
³ Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
⁴ Department of Petroleum Engineering, College of Petroleum and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.

Abstract

We prepared a series of polyurethane (PU) coatings with defined contents using poly(tetramethylene oxide)glycol (PTMG) with two different molecular weights (i.e., M_n = 2000 and 650), as well as polydimethyl siloxane (PDMS) with a molecular weight of M_n 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.

Keywords: coating; polyurethane; self-healing.