Preparation and Properties of Waterborne Cationic Polyurethanes/Polypyrrole Conductive Composites

Hai Hua Wang; Jin Juan Hu; Yi Ding Shen; Gui Qiang Fei; Juan Zhang

doi:10.4028/www.scientific.net/KEM.538.129

Paper Titles

Optimization of Maximum VO₂ Content in Polymorphous Oxides of Vanadium
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Preparation, Characterization and Thermal Property of Novel Dendritic Liquid Crystal Macromolecule
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Thermal Cycling Effect on Mechanical Properties of Yttria-Stabilized Tetragonal Zirconia
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Fabrication of Electroosmotic Flow Pump on Polymethylemethacrylate Substrate Using Hot Embossing
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Preparation and Properties of Waterborne Cationic Polyurethanes/Polypyrrole Conductive Composites
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Designing of Thermistor Digital Thermometer Based on Unbalanced Electric Bridge
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Influence of Hydrogen Dilution on Microstructure of μc-Si: H Films
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Study on the Synthesis of Nano-Crystalline Mg₂SiO₄ Powders by Aqueous Sol-Gel Process
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Environmental Oxidative Degradation and Biodegradation of Eco-Benign Plastics
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Preparation and Properties of Waterborne Cationic Polyurethanes/Polypyrrole Conductive Composites

Abstract:

A series of waterborne cationic polyurethanes dispersions (CWPU) was prepared through prepolymerization method by reacting polyethylene glycol (PEG1000) and isophorone diisocyanate (IPDI) with N-methyl diethanol amine (MDEA) as chain extender. Then FeCl3 was employed as oxidant, therefore CWPU/polypyrrole (CWPU/PPy) conductive composite was prepared by in situ chemical oxidative polymerization of pyrrole (Py) in CWPU dispersions. Effects of molar ratio of FeCl3 to Py, Py concentration on the resistivity of the CWPU/PPy composite films were investigated. The structure, morphology and thermal stability were also characterized by Fourier infrared spectra (FT-IR), light scattering, TEM, and TGA. FT-IR demonstrated the presence of hydrogen-bonding interactions between CWPU and PPy. The average particle size of CWPU/PPy increased from 10.61nm to 30.29nm compared with pure PU, and corresponding size distribution decreased from 0.850 to 0.346. It was also found that CWPU/PPy displayed as spherical morphology, and no aggregation among particles was detected among particles. TGA certified CWPU/PPy was endowed with better thermal stability. In addition, conductivity stability of composites films was also studied. It was found that composite films not only displayed low resistivity but also improved conductivity stability.