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为了提高环氧/聚酰胺(EP/PAI)树脂体系的耐水性,在环氧树脂的主链上成功地接枝了γ-异氰酸酯基丙基三乙氧基硅烷(IPTES)。用差示扫描量热法(DSC)测试了两种树脂在氯化钠溶液中浸泡不同时间后的玻璃化温度(Tg)。采用旋转法在铝合金表面形成IPTES改性EP/PAI和未改性EP/PAI树脂保护膜层。用电化学阻抗谱(EIS)法测定了IPTES改性与未改性两种EP/PAI树脂膜层在氯化钠溶液中浸泡不同时间的电容大小,由此计算出两种膜层在浸泡不同时间吸水的体积百分数,并分析了水在两种膜层中的吸附行为。结果发现,改性树脂的Tg随浸泡时间增长而增加,改性树脂膜层的吸水性显著降低,水在改性树脂膜层中的扩散不遵从菲克第二定律。
In order to improve the water resistance of the epoxy / polyamide (EP / PAI) resin system, γ-isocyanatopropyltriethoxysilane (IPTES) was successfully grafted onto the epoxy resin backbone. The glass transition temperatures (Tg) of the two resins after immersion in sodium chloride solution at different times were measured by differential scanning calorimetry (DSC). IPTES modified EP / PAI and unmodified EP / PAI resin protective film were formed on the surface of aluminum alloy by rotating method. Electrochemical impedance spectroscopy (EIS) method was used to determine the capacitance of two EP / PAI resin films immersed in sodium chloride solution at different times after IPTES modification and unmodification. Time, the volume percentage of water absorption, and analyzed the adsorption behavior of water in the two films. The results showed that the Tg of the modified resin increased with the soaking time, the water absorption of the modified resin film decreased significantly, and the diffusion of water in the modified resin film did not comply with the second law of Fick.