研究目的
Investigating the novel anti-ultraviolet performances of thin films polyurethane containing nano-mixed oxides CeO2-TiO2.
研究成果
Nano-mixed oxides CeO2-TiO2 was successfully synthesized with an average size of 25 nm and specific area of 65.70 m2 g-1 at a relatively low temperature at 550°C for 2 h. The prepared nanopowder was dispersed into the polyurethane matrix to manufacture a hybrid material with strong anti-UV properties. The materials that contain 1.0 wt% of the CeO2-TiO2 nanoparticles had better anti-UV properties than the others.
研究不足
The methods for improving the compatibility between inorganic particles and polymer matrix are complicated, inconvenient, and expensive. The study focuses on the anti-UV properties and does not extensively cover other potential applications or the long-term stability of the hybrid materials under various environmental conditions.
1：Experimental Design and Method Selection:
The nano-mixed oxides CeO2-TiO2 were synthesized by gel combustion method using polyvinyl alcohol as fuel and mixtures of titanium trichloride and cerium(IV) nitrate at a relatively low calcination temperature of 550°C for 2 h. The prepared CeO2-TiO2 nanoparticles were dispersed in polyurethane matrix in different concentration conditions from
2：0 to 5 wt% to study ultraviolet durability following HONDA HES D 6501-97 standards. Sample Selection and Data Sources:
The samples were prepared with varying concentrations of CeO2-TiO2 nanoparticles (
3：0 wt%, 3 wt%, 5 wt%, 0 wt%, and 5 wt%) in polyurethane matrix. List of Experimental Equipment and Materials:
Chemicals at analytical grade including Ce(NO3)
4：6H2O 9%, TiCl3 9%, polyvinyl alcohol (PVA) 99%, polyisocynate 9%, acrylic polyol 8%, meta-Xylene were purchased from Sigma-Aldrich and Merck. Equipment used includes QUV accelerated weathering tester, FE-SEM by Hitachi S-4800 microscope, Quantachrome Autosorb-iQ Station 1, and Cary 630 FTIR spectrometer. Experimental Procedures and Operational Workflow:
The nanoparticles were synthesized, characterized, and then dispersed into the polyurethane matrix. The mixture was sprayed on cellophane to test the mechanical and anti-UV properties. The anti-UV properties were evaluated after 400 h of exposure in the QUV accelerated weathering tester.
5：Data Analysis Methods:
The anti-UV characteristics were analyzed by the specular gloss at 60° and the color difference of the thin film.
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