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Full-Text Articles in Physical Sciences and Mathematics
Synthesis Of Environmentally-Friendly Polyurethane Dispersions Based On Soybean Oil- Derived Polyols And Their Applications In Advanced Water-Based And Uv-Cure Coatings, Senthikumar Rengasamy
Synthesis Of Environmentally-Friendly Polyurethane Dispersions Based On Soybean Oil- Derived Polyols And Their Applications In Advanced Water-Based And Uv-Cure Coatings, Senthikumar Rengasamy
Master's Theses and Doctoral Dissertations
Polyurethane dispersions (PUD) have established themselves as most versatile polymeric binder in coating, adhesive, sealant, and elastomer industries. Like any other polymers, PUDs also have certain limitations, such as hydrolytic stability, water resistance, and oil resistance. In order to develop these properties, two different polyol families were synthesized. The first polyol can be used in ambient curable systems, and the second can be utilized in ultraviolet radiation cure coatings. For ambient curable systems polyether chemistry based soy-polyol was developed from epoxidized soy fatty acid methyl ester (ESFAME). The cationic ring opening of oxirane oxygen groups from ESFAME resulted in polyol …
Characterization Of Mirco/Nano Mechanical And Tribological Properties Of Polymeric Coatings Deposited On Steel, Dustin Neill
Characterization Of Mirco/Nano Mechanical And Tribological Properties Of Polymeric Coatings Deposited On Steel, Dustin Neill
Master's Theses and Doctoral Dissertations
This study aims to characterize the mechanical and tribological properties of three different polymeric coatings—polyurethane, 2K, and melamine—deposited on steel by analyzing the hardness, elastic modulus, and scratch resistance of each coating. This was accomplished by making indentation and scratch tests on each sample with a nano-indenter and analyzing the results with a Scanning Probe Microscope (SPM). Results of indentation tests show that melamine, with a hardness of 0.164 GPa and a modulus of 3.367 GPa, was both the hardest and stiffest of the three coatings, while the 2K coating, with a hardness of .104 GPa and a modulus of …