低温等离子体处理对聚乳酸非织造布材料性能的影响

摘要

采用低温等离子体处理技术对聚乳酸非织造布材料进行不同时间的等离子体处理,计算处理前后的失重率,并利用扫描电子显微镜(SEM)和傅里叶变换红外光谱(FT-IR)分别考察了试样的表面形态和内部结构的变化,分析了处理时间对试样的润湿接触角和自然降解性能的影响.结果表明:在一定时间范围内,增加处理时间,聚乳酸非织造布的失重率逐渐增大,润湿接触角逐渐下降,经处理5 min后,由原来的113.86°下降为70.27°.这表明由于低温等离子体处理会对材料表面产生一定的刻蚀,同时增加了一些官能团尤其是亲水性基团,最终使其吸湿性和生物降解性都有所提高.%Polylactic acid(PLA)nonwoven materials were treated by low temperature plasma under different treatment time. Firstly, the weight loss rate of materials was calculated before and after treatment. And to observe the surface properties and internal structures of samples, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) were used. Finally, the study focused on the wetting contact angle and the biodegradable property of materials, which were modified by low temperature plasma. The results indicate that the weight loss rate of PLA nonwoven materials increases significantly with the increase of treatment time. The wetting contact angle of samples declines from 113.86° to 70.27° when they are treated for only 5 min, which is due to the etching effect of plasma and some functional groups especial hydrophilic groups added by plasma treatment. Ultimately, hygroscopicity and biodegradability of materials are improved.