Outdoor exposure and accelerated weathering of polyurethane/polysiloxane hybrid coatings was written by Gao, Tongzhai;He, Zhouying;Hihara, Lloyd H.;Mehr, Hamideh Shokouhi;Soucek, Mark D.. And the article was included in Progress in Organic Coatings in 2019.Computed Properties of C9H20O2 The following contents are mentioned in the article:
Two Polyurethane/polysiloxane hybrid coatings were compared using both real time exposure and accelerated weathering. The urethane coatings were differentiated by oligoesters selection with one being derived from cyclohexane diacids (CHDA) and 2-butyl-2-ethyl-1,3-propanediol (BEPD) and the other adipic acid (AA), isophthalic acid (IPA), 1,6-hexanediol (HD), and trimethylol propane (TMP). Three sites in Hawaii, Campbell Industrial Park (CIP), Kilauea Volcano, and Marine Corp Base Hawaii (MCBH), were selected for the outdoor exposure test with the increasing severity of the environment. After weathering, the coatings were analyzed by Fourier transform IR spectroscopy (FTIR) and solid state 13C NMR (NMR), Dynamic mech. anal. (DMA) and differential scanning calorimetry (DSC), and Scanning electronic microscopy (SEM). Urethanes based on cycloaliphatic oligoesters exhibited much better appearance compared to the aromatic-based polyesters. A degradation of both the carbamate and ester functionality was observed spectroscopically which was accompanied by an increase in Tg, and erosion of the surface of the coatings. It was found that the accelerated weathering test conducted in weatherometer provides harsher conditions than the three outdoor exposure tests (marine, volcano, and industrial park), while marine is the harshest among the three outdoor exposure sites. This study involved multiple reactions and reactants, such as 2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4Computed Properties of C9H20O2).
2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4) belongs to alcohols. Alcohols are weak acids. The most acidic simple alcohols (methanol and ethanol) are about as acidic as water, and most other alcohols are somewhat less acidic. Alcohols may be oxidized to give ketones, aldehydes, and carboxylic acids. These functional groups are useful for further reactions. Oxidation of organic compounds generally increases the number of bonds from carbon to oxygen (or another electronegative element, such as a halogen), and it may decrease the number of bonds to hydrogen.Computed Properties of C9H20O2
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts