To prepare bio-inspired antifouling coating materials having similar structure with lotus, self-crosslinkable waterborne polyurethanes emulsions containing paraffin wax (CWPU/P0, 0.25, 0.5, 1.0, 1.5, 2.0, the number indicated the wt% of wax) were prepared by an emulsifier-free/solvent free prepolyme...
To prepare bio-inspired antifouling coating materials having similar structure with lotus, self-crosslinkable waterborne polyurethanes emulsions containing paraffin wax (CWPU/P0, 0.25, 0.5, 1.0, 1.5, 2.0, the number indicated the wt% of wax) were prepared by an emulsifier-free/solvent free prepolymer mixing process. The as-polymerized CWPU/P emulsions containing 0 - 1.00wt% of paraffin wax were found to be stable after 4 months, however, CWPU/P emulsions containing 1.50 and 2.00wt% of paraffin wax were unstable within 1 month storage. Considering the stability of emulsions, the optimum paraffin wax content was found to be about 1wt% to obtain stable antifouling coating emulsion material. The surface topology of CWPU/P film samples was characterized by atomic force microscopy (AFM). This study examined the effect of paraffin wax content on the surface roughness, water contact angle/surface energy, water swelling, light transmittance and tensile properties of CWPU/P film samples.
To prepare bio-inspired antifouling coating materials having similar structure with lotus, self-crosslinkable waterborne polyurethanes emulsions containing paraffin wax (CWPU/P0, 0.25, 0.5, 1.0, 1.5, 2.0, the number indicated the wt% of wax) were prepared by an emulsifier-free/solvent free prepolymer mixing process. The as-polymerized CWPU/P emulsions containing 0 - 1.00wt% of paraffin wax were found to be stable after 4 months, however, CWPU/P emulsions containing 1.50 and 2.00wt% of paraffin wax were unstable within 1 month storage. Considering the stability of emulsions, the optimum paraffin wax content was found to be about 1wt% to obtain stable antifouling coating emulsion material. The surface topology of CWPU/P film samples was characterized by atomic force microscopy (AFM). This study examined the effect of paraffin wax content on the surface roughness, water contact angle/surface energy, water swelling, light transmittance and tensile properties of CWPU/P film samples.
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문제 정의
The objective of this research is the fabrication of antifouling coating materials having similarstructure with lotus from waterborne polyurethanes (WPUs) emulsions containing different content of paraffin wax. The WPUs, which is environment friendly, have received considerable attention in the past few decades because of their applicationsin coatings and adhesives for various substrates1,2).
제안 방법
The resulting CWPU/P film samples were characterized using Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), transmitted light optical microscopy, UV-visible spectra and contact angle measurement. This study focused on the effect of paraffin wax content (0, 0.25, 0.50, 1.00, 1.50, 2.00wt%) on the surface morphology, water swelling, water/ethylene glycol contact angle/surface tension and mechanicalstrength of CWPU/P films with a fix content ofself-crosslinkable APTES and DMPA.
To obtain bio-inspired antifouling coating materials having similar structure with lotus, self-crosslinkable waterborne polyurethanes emulsions with various content of paraffin wax (CWPU/P0, 0.25, 0.50, 1.00, 1.50, 2.00, the number indicated the wt% of wax) were prepared by an emulsifier-free/solvent free prepolymer mixing process. The as-polymerized CWPU/P emulsions containing 0-1.
대상 데이터
The testing liquids used were water (L1) and ethylene glycol (L2), and their γL1d, γL1p, γL2d, and γL2p were 21.8, 51.0, 29.27 and 19.0 mN/m, respectively16).
이론/모형
H12MDI was then slowly dropped into the flask, and the reaction mixture was allowed to react at 85℃ under stirring (125-150rpm) until the theoretical NCO content was reached. The change in the NCO value during the reaction was determined with the standard dibutylamine back-titration method (ASTM D 1638). The obtained NCOterminated urethane prepolymer was cooled to 45℃, and 3-aminopropyl triethoxysilane (APTES) was added to the flask and reacted at 45℃ for 30min.
The hardness was measured using a Shore A type durometer (Kobunshi Keiki, Japan) according to the ASTM D 2240. The values quoted are the average of five measurements.
성능/효과
00wt%, and then increased significantly. From these results, we can assume that the content of remained paraffin wax in polyurethane matrix increased with increasing paraffin wax content up to 1.00wt%, and then decreased significantly. Generally, in a blend of incompatible components, a small amount of the dispersed phase component is dispersed to some extent in the continuous phase.
Thisindicatesthat the mechanical properties of the CWPU/P film is dependent on the amount of dispersed wax remaining in the film. The tensile strength of CWPU/P film samples prepared in this study was found to decrease with increasing the dispersed component paraffin wax content up to 1wt%. However, AFM studies showed that the excessive wax content (1.
There is close correlation between mechanical properties and remained paraffin wax content in CWPU/P blends. The tensile strength/modulus of the film samples decreased markedly from 38.71/21.40 to 27.36/12.81MPa with increasing paraffin wax content up to 1.00wt%, and then increased significantly, while the elongation at break increased from 661.33 to 799.38%, and then decreased. The tensile modulus and hardness (Shore A) of the film samples decreased with increasing paraffin wax content up to 1.
참고문헌 (19)
Q. B. Meng, S. I. Lee, C. W. Nah, and Y. S. Lee, Preparation of Waterborne Polyurethane Using an Amphiphilic Diol for Breathable Waterproof Textile Coatings, Progress in Organic Coatings, 66, 382(2009).
M. M. Rahman, A. Hasneen, N. J. Jo, H. I. Kim, and W. K. Lee, Properties of Waterborne Polyurethane Adhesives with Aliphatic and Aromatic Diisocyanates, J. Adhesion Science Technology, 25, 2051(2011).
I. Marcu, E. S. Daniels, V. L. Dimonie, C. Hagiopol, J. E. Roberts, and M. S. El-Aasser, Incorporation of Alkoxysilanes into Model Latex Systems: Vinyl Copolymerization of Vinyltriethoxysilane and n-Butyl Acrylate, Macromolecules, 36, 328(2003).
F. D. Osterholtz and E. R. Pohl, Kinetics of the Hydrolysis and Condensation of Organofunctional Alkoxysilanes: A Review, J. Adhesion Science Technology, 6, 127(1992).
Y. G. Park, Y. H. Lee, M. M. Rahman, C. C. Park, and H. D. Kim, Preparation and Properties of Waterborne Polyurethane/Self-Cross-Linkable Fluorinated Acrylic Copolymer Hybrid Emulsions Using a Solvent/Emulsifier-Free Method, Colloid Polymer Science, 293, 1369(2015).
D. H. Kim, Y. H. Lee, C. C. Park, and H. D. Kim, Synthesis and Surface Properties of Self-Crosslinking Core-Shell Acrylic Copolymer Emulsions Containing Fluorine/silicone in the Shell, Colloid Polymer Science, 292, 173(2014).
H. L. Kim, Y. H. Lee, J. S. Kim, C. C. Park, H. Park, H. H. Chun, and H. D. Kim, Preparation and Properties of Crosslinkable Waterborne Polyurethane and Polyurethane-Acrylic Hybrid Emulsions and Their Crosslinked Polymers, J. Polymer Research, 23, 240(2016).
M. M. Rahman, H. W. Chun, and H. Park, Preparation and Properties of Waterborne Polyurethane-Silane: A Promising Antifouling Coating, Macromolecular Research, 19, 8(2011).
E. Fallahi, M. Barmar, and M. H. Kish, Effectiveness of Heat Protection of Fabrics Loaded with Phase Change Materials, e-Polymers, 119, 2197(2009).
G. Socrates, "Infrared Characteristic Group Frequencies: Tables and Charts", John Wiley and Sons, New York, pp.34-41, 1994.
M. M. Rahman, I. Lee, H. H. Chun, H. D. Kim, and H. Park, Properties of Waterborne Polyurethane-Fluorinated Marine Coatings: The Effect of Different Types of Diisocyanates and Tetrafluorobutanediol Chain Extender Content, J. Applied Polymer Science, 131, 39905(2014).
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