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Acid treatment and properties of aramid fiber

Luo Jun,Xie Guangyin,Guo Shuangqing (Xi'an Polytechnic University,Xi'an 710048)  
Aramid fiber and fabric were soaked in a 50%acetone solution by mass fraction and were treated with phosporous acid and sulphuric acid solutions after ultrasonic treatment.The structure,surface morphology and mechanical properties of aramid fiber and fabric were studied before and after acid treatment.The results showed that the surface of the aramid fiber was smooth before acid treatment,but was obviously etched after acid treatment.The strength of the fiber and fabric dropped less after treating with 20%phosporous acid by mass fraction which provided a wonderful treating effect.Sulphuric acid with the mass fraction of 20%was better in the treating effect than phosporous acid.
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