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

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., 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.

Understanding the Interactions between Soft Segments in Polyurethanes: Structural Synergies in Blends of Polyester and Polycarbonate Diol Polyols

“…The polyester polyols imparted good mechanical properties to the PUs but poor resistance to hydrolytic degradation [15,25]. In order to balance the hydrolytic degradation and the mechanical properties of the PUs, different blends of polyols of the same nature with different molecular weights [2,24,35] or polyols of different nature [16,[25][26][27][28][29][30] have been used. The improved properties of PUs made with blends of polyols have been demonstrated, but poor attention has been paid to the interactions between SSs.…”

Effects of dopamine‐modified ZnO and Ce‐Zr oxides on UV resistance and thermal stability of epoxy composites

“…In the meantime, CeO 2 is also of interest based on its low toxicity, inexpensive and has filler properties. Rahman et al 17 prepared PU‐11‐3‐3‐CeO 2 coated dispersions by applying in situ polymerization and mixing processes, respectively. The coating based on in situ polymerization exhibited similar self‐healing properties.…”

“…In the meantime, CeO 2 is also of interest based on its low toxicity, inexpensive and has filler properties. Rahman et al 17 Although these materials have good UV-shielding properties, their main drawback is that they may be incompatible with organic polymer materials. This incompatibility usually leads to phase separation between the NPs and the polymer matrix, which results in secondary agglomeration.…”