CAJ | 학술논문

用中等气压空气中均匀介质阻挡放电(DBD)产生的低温等离子体对聚甲基丙烯酸甲酯(PMMA)和聚碳酸酯(PC)两种聚合物薄膜进行表面改性,研究了DBD等离子体处理对两种材料表面亲水性的影响.通过接触角测量和表面能测量以及全反射傅里叶变换红外光谱等手段研究了等离子体处理前后PMMA和PC的表面特性.测量了不同功率密度下材料表面水接触角和表面能随处理时间的变化规律以及处理后的材料在空气中放置时的退化效应,并对改性的机理进行分析.结果表明,两种聚合物薄膜经DBD等离子体处理后,接触角随处理时间的增加而降低,表面能随处理时间的增加而增加,两者均在一定处理时间达到饱和值;增大均匀DBD处理的功率密度,利用更少的处理时间就能得到同样的处理效果.处理后的材料在空气中放置时会出现退化效应,但即使放置14d后材料表面水接触角仍远低于处理前的值.
용중등기압공기중균균개질조당방전(DBD)산생적저온등리자체대취갑기병희산갑지(PMMA)화취탄산지(PC)량충취합물박막진행표면개성,연구료DBD등리자체처리대량충재료표면친수성적영향.통과접촉각측량화표면능측량이급전반사부리협변환홍외광보등수단연구료등리자체처리전후PMMA화PC적표면특성.측량료불동공솔밀도하재료표면수접촉각화표면능수처리시간적변화규률이급처리후적재료재공기중방치시적퇴화효응,병대개성적궤리진행분석.결과표명,량충취합물박막경DBD등리자체처리후,접촉각수처리시간적증가이강저,표면능수처리시간적증가이증가,량자균재일정처리시간체도포화치;증대균균DBD처리적공솔밀도,이용경소적처리시간취능득도동양적처리효과.처리후적재료재공기중방치시회출현퇴화효응,단즉사방치14d후재료표면수접촉각잉원저우처리전적치.
The surfaces of polymethylmetacrylate (PMMA) and polycarbonate (PC) films were modified by homogeneous,dielectric barrier discharge (DBD) plasma at medium pressure air.The impacts of the surface modification conditions,including the power densities,modification time,and exposure time in air,on properties of the films were studied.The surface hydrophilicity of the two types of films,before and after the surface modifications,were evaluated via the contact angle measurement,surface energy evaluation and with attenuated total reflectance Fourier transform infraed spectroscopy (ATR-FTIR).The results show that the surface modification significantly affects the hydrophilicity of all the films.For example,as the modification time increases,the contact angle decreases,the surface energy increases,and the above two parameters saturate at a critical modification time;a combination of an increase power density and a much shorter modification time leads to the same results.Interesting finding is that though aging effect was observed,after 14 days of exposure to air,their water contact angles were still much smaller than those of the control samples.