Hydrophilic Surface Modification of Polydimethylsiloxane with UV/Ozone Treatment
Lü Hong-feng1, YAN Wei-ping2*, LIU Zhi-huan2, LI Jie-chao2
1. China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 510610, China 2. School of Electronic Science and Technology, Dalian University of Technology, Dalian 116024, China
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.
[1] MENG Fei, CHEN Heng-wu, FANG Qun, et al(孟 斐，陈恒武，方 群, 等). Chemical Journal of Chinese Universities(高等学校化学学报), 2002, 23(7): 1264. [2] Chen L, Ren J, Bi R, et al. Electrophoresis, 2004, 25(6): 914. [3] Lü H F , Yan W P , Pan L. Sensor Letters, 2011, 9(2): 755. [4] Zhou J, Khodakov D A, Ellis A V, et al. Electrophoresis, 2012, 33(1): 89. [5] Makamba H, Kim J H, Lim K, et al. Electrophoresis, 2003, 24(21): 3607. [6] Zhou J, Ellis A V, Voelcker N H. Electrophoresis, 2010, 31(1): 2. [7] Berdichevsky Y, Khandurina J, Guttman A, et al. Sensors and Actuators B: Chemical, 2004, 97(2-3): 402. [8] Roy N, Bhowmick A K. Polymer, 2010, 51(22): 5172. [9] YANG Shi-ling, YUE Li, JIA Zhi-jun(杨世玲，岳 莉，贾志君). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2014, 34(9): 2407. [10] Maji D, Lahiri S K, Das S. Surface and Interface Analysis, 2012, 44(1): 62. [11] Innocenzi P, Martucci A, Guglielmi M, et al. Journal of the European Ceramic Society, 2001, 21(10-11): 1985. [12] Xu Y, Zhang B, Hao Fan W, et al. Thin Solid Films, 2003, 440(1): 180. [13] Ouyang M, Muisener R J, Boulares A, et al. Journal of Membrane Science, 2000, 177(1): 177. [14] Waddell E A, Shreeves S, Carrell H, et al. Applied Surface Science, 2008, 254(17): 5314. [15] Ma K, Rivera J, Hirasaki G J, et al. Journal of Colloid and Interface Science, 2011, 363(1): 371. [16] Wu Z, Yan H, Chen H, et al. Applied Surface Science, 2009, 255(8): 4702.
