光谱学与光谱分析, 2016, 36 (4): 1033, 网络出版: 2016-12-20  

紫外/臭氧法PDMS表面亲水改性机理研究

Hydrophilic Surface Modification of Polydimethylsiloxane with UV/Ozone Treatment
作者单位
1 工业和信息化部电子第五研究所, 广东 广州 510610
2 大连理工大学电子科学与技术学院, 辽宁 大连 116024
摘要
紫外/臭氧改性法是一种操作简单、 成本低廉的PDMS表面亲水改性方法。 采用该方法对PDMS表面进行亲水改性, 利用接触角测量仪对改性效果进行评价, 并与PDMS无臭氧紫外法进行了比较。 测试表明PDMS表面经紫外/臭氧法处理12小时后, 表面接触角达到60°左右, 在空气中放置两周后仍保持较好的亲水性。 其改性机理可以通过多种表征手段进行分析。 红外光谱测试可以看出, PDMS在经过紫外/臭氧改性后, 其表面官能团变化明显, 随改性时间延长, 疏水基团—CH3逐渐减少, 亲水基团Si—OH和—OH逐步增加, 二氧化硅典型红外光谱峰也同时出现。 通过扫描电镜和能谱测试可以看出, PDMS表面经过改性产生了二氧化硅为主的硅的氧化物。 综合上述结果, 紫外/臭氧处理法能够使PDMS表面亲水基团增多, 同时生成类玻璃态SiOx薄层, 既改善了PDMS表面的亲水性, 又阻止了PDMS表面疏水性的完全恢复, 亲水性可以长时间保持。
Abstract
The UV/ozone surface treatment was a simple and low cost hydrophilic modification method. In this paper, UV/ozone treatment is utilized to hydrophilize the surface of PDMS and the results are compared. Contact angle is applied to estimate the effect and stability of the modified surfaces. The results show that the contact angle is around 60° on the PDMS surface with UV/ozone treatment after 12 hours, and it can maintain the surface hydrophilicity in two weeks under ambient atmosphere. The results of FTIR spectroscopy indicate that many chemical functional groups of PDMS surface have been changed with UV/ozone modification, —CH3 hydrophobic group gradually decrease over time, —OH and Si—OH hydrophilic groups increase obviously, and the characteristic peaks of SiO2 gradually appear. Through SEM/EDS analysis, it has been found that the major constituent of the surface of PDMS is SiO2 after the surface modification. These results demonstrate that the more hydrophilic groups and the glass-like SiOx layer are formed on the PDMS surface modified with UV/ozone, which enhance the surface hydrophilic and minimize the hydrophobic recovery.

吕宏峰, 闫卫平, 刘志环, 李杰超. 紫外/臭氧法PDMS表面亲水改性机理研究[J]. 光谱学与光谱分析, 2016, 36(4): 1033. L Hong-feng, YAN Wei-ping, LIU Zhi-huan, LI Jie-chao. Hydrophilic Surface Modification of Polydimethylsiloxane with UV/Ozone Treatment[J]. Spectroscopy and Spectral Analysis, 2016, 36(4): 1033.

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