A study on water absorption in freestanding polyurethane films filled with nano-TiO2 pigments by capacitance measurements
来源期刊：Acta Metallurgica Sinica2009年第1期
论文作者：Hongwei SHI Fuchun LIU Enhou HAN Mingcheng SUN
Key words：Water absorption; Nano-TiO2; Polyurethane; EIS;
Abstract: The electrochemical impedance spectroscopy (EIS) was used to evaluate the water transport and dielectric properties of polyurethane films filled with nano-TiO2 at different pigment/base (P/B) values in 0.5 mol/L NaCI solutions. EIS results were compared with gravimetric measurements on the freestanding films. The amount of water absorption showed great discrepancy between the two methods. The diffusion coefficient in the polyurethane film with P/B=30% was the smallest among those filled with nano-TiO2 pigments. The dielectric constant e of the polyurethane varnish film obtained from the initial capacitance was in the range of typical values of polymers. SEM was used to measure the distribution of nano-TiO2 particles in the polyurettane films.
Hongwei SHI1，Fuchun LIU1，Enhou HAN1，Mingcheng SUN1
(1.State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
Abstract:The electrochemical impedance spectroscopy (EIS) was used to evaluate the water transport and dielectric properties of polyurethane films filled with nano-TiO2 at different pigment/base (P/B) values in 0.5 mol/L NaCI solutions. EIS results were compared with gravimetric measurements on the freestanding films. The amount of water absorption showed great discrepancy between the two methods. The diffusion coefficient in the polyurethane film with P/B=30% was the smallest among those filled with nano-TiO2 pigments. The dielectric constant e of the polyurethane varnish film obtained from the initial capacitance was in the range of typical values of polymers. SEM was used to measure the distribution of nano-TiO2 particles in the polyurettane films.
Key words:Water absorption; Nano-TiO2; Polyurethane; EIS;
【全文内容正在添加中】
