自修复抗穴蚀微胶囊的制备及性能表征

Preparation and Characterization of Anti-Cavitation Microcapsules

探究了W/O乳液自由基原位聚合制备以聚丙烯酰胺(PAM)水溶液为芯材、甲基丙烯酸酯树脂共聚物P(MMA-co-BMA)为壁材的自修复抗穴蚀微胶囊的方法。采用热重分析、红外光谱、扫描电镜等手段对自修复抗穴蚀微胶囊进行了性能分析和形貌表征。结果表明,此方法能合成P(MMA-co-BMA)包覆PAM水溶液微胶囊,其粒径约为40μm,包覆率达到70%以上。通过改变P(MMA-co-BMA)中甲基丙烯酸甲酯(MMA)、甲基丙烯酸丁酯(BMA)的共聚比例,制备出具有不同自修复抗穴蚀行为的微胶囊,将其添加到环氧树脂基体中固化,通过超声磁致振动装置定量表征了改性环氧树脂的失重性能。实验结果表明,PAM水溶液微胶囊具有自修复抗穴蚀性能,当BMA、MMA共聚比例为2.5∶7.5时,微胶囊抗穴蚀性能最佳。

This paper explored the mechanism of W/O emulsion free radical in-situ polymerization to prepare self-repairing cavitation microcapsules using polyacrylamide(PAM)aqueous solution as core material and methacrylic ester resin copolymer P(MMA-co-BMA)as wall material.Thermogravimetric analysis(TGA),infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and other characterization methods were used to characterize the self-repaired anti-cavitation microcapsules.The results show that this method can synthesize P(MMA-co-BMA)coated PAM aqueous solution microcapsules with a particle size of about 40μm and a coverage rate more than 70%.By changing the copolymerization ratio of methyl methacrylate(MMA)and butyl methacrylate(BMA)in P(MMA-co-BMA),microcapsules with different self-repair and cavitation resistance behaviors were prepared and added to the epoxy resin matrix.And curing,the thermal stability of the modified epoxy resin was quantitatively characterized by ultrasonic magnetic vibration device.The experimental results show that the PAM aqueous solution microcapsules have self-repairing and anti-cavitation properties.When the copolymerization ratio of BMA and MMA is 2.5∶7.5,the micro-capsules have the best anti-cavitation erosion performance.