GPTMS涂层与等离子体处理复合改性聚合物微流控通道

Surface modification technology for polymer microfluidic channels combining GPTMS coating and plasma treatment

为了提升聚合物材料的表面改性效果,采用γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTMS)涂层与等离子体处理相结合的方法,对聚甲基丙烯酸甲酯(PMMA)、聚苯乙烯、聚对苯二甲酸乙二酯、聚丙烯和聚碳酸酯5种常见聚合物材料的表面改性效果进行了研究。通过分析表面润湿性(接触角)、化学成分、粗糙度以及微流控通道中的流体流动性能及其时效性,探讨了该改性方法的机制和效果。结果表明,GPTMS涂层与等离子体处理(GP-Plasma)复合改性相较于等离子体处理能够显著提高这5种聚合物材料的表面亲水性和时效性,复合改性后聚合物材料表面接触角可降至接近0°,并在-15℃储存28 d后仍保持接触角低于20°。X射线光电子能谱和傅里叶变换红外光谱分析表明,复合改性后PMMA材料的O/C原子比提升了约140%,并形成了Si—O—Si键。原子力显微镜结果表明GP-Plasma复合改性后PMMA材料的表面粗糙度相较于等离子体处理提升95%,进一步提升了表面润湿性。在微流控通道流动测试中,复合改性后PMMA样品的流体流动时间平均缩短64%,并实现了稳定的液体流动,显示出该复合改性技术在实际应用中的潜力。

To enhance the surface modification effectiveness of polymer materials,a combined treatment approach using 3-glycidyloxypropyltrimethoxysilane(GPTMS)coating and plasma treatment was used for investigating the surface modification effects of five common polymers,including polymethyl methacrylate(PMMA),polystyrene,polyethylene terephthalate,polypropylene,and polycarbonate.The mechanism and effectiveness of this modification were examined by analyzing surface wettability(contact angle),chemical composition,roughness,fluid flow performance in microfluidic channels,and their durability.The results indicate that the combined GPTMS coating and plasma treatment,referred to as GP-Plasma modification,significantly improves the surface hydrophilicity and durability of the five polymer materials compared to plasma treatment alone.The contact angles of the modified polymers surfaces are reduced to nearly 0°,and remained below 20°after 28 days storage at-15℃.X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy analyses confirm an approximate 140%increase in the O/C atomic ratio of PMMA and the formation of Si—O—Si bonds following the GP-Plasma modification.The atomic force microscopy results indicate that the surface roughness of PMMA is increased by 95%after GP-Plasma modification compared to plasma treatment,further enhancing surface wettability.In microfluidic channels tests,the fluid flow time of the modified PMMA sample is reduced by an average of 64%,achieving stable liquid flow,demonstrating the potential of this modification technology for practical applications.