纳秒紫外激光制备聚二甲基硅氧烷超疏水表面  

Altering the Contact Angle of Polydimethylsiloxane Surface with Nanosecond UV Laser

作　　者：洪文生[1] 邓宇[1] 黄志刚[1] 郭钟宁[1] 麦文豪 

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《高分子材料科学与工程》2018年第1期125-129,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51175091);广东省青年创新人才(自然)(2015KQNCX027)

摘　　要：利用纳秒紫外激光对聚二甲基硅氧烷进行表面加工,研究了激光功率密度、光斑重叠率和线距等工艺参数对改性后聚二甲基硅氧烷表面接触角的影响。结果表明,增大激光功率密度、光斑重叠率或减小线距,均会使聚二甲基硅氧烷表面接触角呈上升趋势,并且都是先缓慢到急剧的一个变化过程。当激光功率密度达到1.56×106W/cm2,光斑重叠率为75%,线距为120μm时,表面水接触角达到最高154°。通过傅里叶变换红外光谱测试发现激光作用未改变材料化学组分,但通过扫描电镜的表征发现聚二甲基硅氧烷表面形成微纳嵌套结构。基于Cassie-Baxter模型,分析了激光形成的微纳嵌套结构对聚二甲基硅氧烷表面接触角的影响规律。A nanosecond UV laser was utilized to modify the surface of polydimethylsiloxane（PDMS）.The experiments were specifically conducted to reveal the effects of laser fluency,spot overlapping and scanning distance on the surface wettability of PDMS.The results show that increasing the laser fluency,spot overlapping or decreasing the scanning distance will make the contact angle of PDMS surface increasing,and all of them are slowly changing to a sharp change process.When the laser fluency is 1.56×10~6 W/cm^2,the spot overlapping is 75% and scanning distance is 120μm,the surface water contact angle reaches the highest 154°.The highest water contact angle can reach 154°.The modified surface was characterized by Fourier transform infrared spectroscopy（FT-IR） and scanning electron microscopy（SEM）.It is noted that there are no chemical changes but a micro-nano physical structure formed on the surface after laser process.With Cassie-Baxter model,the mechanism how micro-nano structure affects contact angle is theoretically analyzed.

关 键 词：纳秒紫外激光器 表面改性 聚二甲基硅氧烷 接触角 

分 类 号：O634.41[理学—高分子化学]