Investigation On Synthesis And Characterization Polyether Waterborne Polyurethane / Hexafluorobutly Acrylate Composite Latex

In this thesis, we focused on the preparation and characterization of polyether waterborne polyurethane / hexafluorobutly acrylate composite latexes.The main contents were summarized as follows:1. Investigation on Synthesis and Characterization of polyether waterborne polyurethane Latexes based on IPDI (WPU)WPU were synthesized with DMPA,IPDI and PPG as the main raw materials. The effects on the emulsion phase transiton, viscosity, stability, membrane mechanical properties and resistance to medium performance of the WPU were studied by FT-IR, viscosity testers and LPA and so on. The results showed that with increasing the value of R, the dispersions viscosity, the average particle size, tensile strength of the WPU films and the resistance to water increased, while the phase transition point delayed, the dispersions stability and the tensile elongation was decreased. With the content of DMPA increasing, the effects were quite opposite in the addition of the phase transition point. Through the ionization of the PU-1 in which the value of R was 1.5 and the content of DMPA was 7wt%, the WPU overall performance was excellent, which provided a better prerequisite for subsequent modification based on comprehensive consideration of the above performance.2. Effect of HPMA on the Properties of PUA composite LatexesDouble bond-end capped Polyurethane macromonomers (PUL) were synthe- -sized with PU-1 and HPMA. Through emulsifier-free emulsion polymerizati on of PUL, butyl acrylate (BA) and styrene (St), the PUA hybrid latexes were prepared. The structures, the thermal properties, the dimension and morphology of PUA latexes were studied by FT-IR, TGA and TEM.The results showed that HPMA can successfully provide the bridge of PU, PA copolymerization. The average thicknesses of the PA, PU layer of PUA latexes particles with even distribution were 290nm and 105nm, respectively. As HPMA increased, the stability and thermal stability of PUA membranes were enhanced, while water absorption of PUA film was falling, following by the rising trend. When the content of HPMA is 75% (PUL-1), the overall performance of PUA latexes were excellent. 3. Investigation on Synthesis and Characterization of FPUL composite latexesThrough emulsifier-free emulsion polymerization of PUL-1 and F6BA, the FPUL composite latexes were prepared. The structures, the thermal properties, the dimension and morphology of FPUL latexes were studied by FT-IR, TGA and TEM. The results showed that the glass transition temperatures of the soft and hard segment were respectively 6.5℃, 43.8℃. The layer size of the core and the shell of FPUL were about 237nm and 131nm, respectively. The surface free energies of FPUL films reached 11.56mJ·m^-2 at 50% F6BA.4. Investigation on Synthesis and Characterization of FPUA styrene composite latexesThrough emulsifier-free emulsion polymerization of PUL-1, F6BA, BA and St, the FPUA composite latexes were prepared and characterized by FT-IR, TGA, DSC, LPA and TEM. The results showed that the glass transition temperatures of the soft and hard segment were respectively -1.8℃, 37.0℃. The heat resistance of FPUA was more excellent. The size of the core-shell particles was about 1.43μm and distribution was even. The layer size of the core and the shell -were about 425nm and 975nm, respectively. The surface free energies of FPUA films decreased with increasing of F6BA and reached 23.87mJ·m^-2 at 20.8% (mass) F6BA.