摘要
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。
γ-isocyanatopropyltriethoxysilane （ IPTES）was grafted successfully on fundamental chain epoxy resin in order to improve water resistance of epoxy/polyamide（EP/PAI）resin system. Glass-transition temperature （Ts）of two kinds of resins dipping in NaC1 solution for different time were tested with differential scanning calorimetry （DSC）. The IPTES-modified EP/PAI and unmodified EP/PAI resin coating were formed on Al-alloys surface by a spin coater. The capacitances of IPTES-modified and unmodified EP/PAI coating after dipping in NaC1 solution for different time,which were measured by electrochemical impedance spectroscopy （EIS）,were employed to calculate the two kinds of volume percentage of water uptake dipping in solution for different time, and the absorption behavior of water in two kinds of coatings were analyzed. The results showed that Ts of the IPTES-modified EP/PAI were increased with dipping time in solution. Water absorptivity of the modified resin coating decreased remarkably,and the diffusion behaviour of water in modified resin coating does not obey the Fick＂ second law.
出处
《中国胶粘剂》
CAS
2007年第7期13-18,共6页
China Adhesives
