氢氧化钠、氨水和冰醋酸对超高模量聚乙烯常压等离子处理效果的影响

Influence of Sodium Hydroxide,Ammonia and Acetic Acid on Atmospheric Pressure Plasma Jet Treatment of Ultrahigh-modulus Polyethylene Fibers

超高模量聚乙烯分别浸于3%冰醋酸,3%氨水,10g/L氢氧化钠24h,然后阴干12h后经常压等离子处理。用SEM和XPS对处理后聚乙烯进行表面形貌和元素含量表征,并测试纤维与树脂的层间剪切力和接触角。SEM结果表明:处理后各试样表面比未处理试样表面粗糙,氢氧化钠浸渍后的纤维表面有少许重结晶的氢氧化钠微粒。经XPS分析,处理后聚乙烯的氧元素含量比未处理的明显增加,纤维表面化学构成也发生了改变,极性基团大大增加。经等离子处理后层间剪切力比未处理的提高了6～7倍;接触角由未处理的99.4°下降到68°左右。经过各种不同试剂浸润的试样同直接处理的试样没有明显差别。

Ultra-high modulus polyethylene（UHMPE） fibers immersed in 3% acetic acid, 3% ammonia and 10 g/L sodium hydroxide respectively for 24 h followed by drying for 12 h in chamber where desiccants were put in, then were treated by atmospheric pressure plasma jet （APPJ）. The resuits showed that atmospheric plasma treatment contributed etching effect on the surface of UHMPE. The surface of the group which immersed in sodium hydroxide was more rough due to sodium hydroxide recrystallization on the surface. Oxygen and polar groups were all increased. The wettability and cohesion property between the fiber and the epoxy resin were all improved greatly. There is no significant difference between samples emerged in solvents or not.