电化学阻抗法研究环氧膜的吸水性能

电化学阻抗法研究环氧膜的吸水性能罗小雯，陈月辉，李善君，周伟舫（复旦大学高分子科学系，化学系，上海，２００４３３）关键词电化学阻抗谱，环氧膜，交联密度，吸水性能水在环氧树脂膜中有较强的吸收和扩散能力，例如ＸＤ７３４２／ＴＭＡＢ于１９５℃固化２４ｈ，在...

Studies on Water Absorption of Epoxy Resins by Electrochemical Impedance Spectroscopy

Electrochemical impedance spectra were measured for the aluminum electrodes coated with epoxy resin films of various different crosslinking densities in 0.5 mol/L NaCl solution(room temperature) at open circuit potential.By fitting the Nyquist curves with the equivalent circuit generally used for the coated electrode,the values of the film resistance,the film capacitance,the electrochemical reaction resistance and the double layer capacitance were obtained and used to discuss the relationship between the structure and the water absorption of epoxy resins.It is found that the amount of the water absorbed in the cured epoxy resins increases with increasing extent of cure.