Analysis of Physical Properties of Hydrogel Lenses Polymer Containing Styrene and PVP

Min-Jae Lee; A-Young Sung

Korean Journal of Materials Research, Vol.29, No.7, 399-407, July, 2019

DOI10.3740/MRSK.2019.29.7.399 Export Citation

Analysis of Physical Properties of Hydrogel Lenses Polymer Containing Styrene and PVP

Min-Jae Lee, and A-Young Sung^†

Department of Optometry & Vision Science, Daegu Catholic University, Gyeongsan, 38430, Gyeongbuk, South Korea

E-mail:

This research is carried out to analyze the effects of Styrene and PVP on the properties of silicone hydrogel lenses. Styrene group and PVP(Polyvinylpyrrolidone) are used as additives for a basic combination containing silicone monomer, TSMA(trimethylsilyl methacrylate) and DMA(n,n-dimethylacrylamide) added to the mix at ratios of 1~10 %. Silicone hydrogel lens is produced by cast-mold method. The polymerized lens sample is hydrated in a 0.9 % saline solution for 24 hours before its optical and physical characteristics are measured. Measurement of the physical characteristics of the produced material shows that the refractive index is 1.3682~1.4321, water content 77.11~45.73 %, visible light transmittance 95.14~88.20 %, and tensile strength 0.0652~0.3113 kgf. The results show a decrease of refractive index as the ratio of additives and water content decreases. The result of the stabilization test of polymerization show an increase of extractables along with increase of the ratio of additives, but the difference is not significant for all samples, so it can be judged that the stabilization of the polymer is maintained. Therefore, the additions of styrene and PVP should be taken into consideration for their effects on the physical properties of silicone hydrogel lens.

Keywords:styrene group;polyvinylpyrrolidone;polymerization stability;water content;oxygen permeability

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[1] Kim TH, Sung AY, J. Korean Chem. Soc., 54, 105 (2010)

[2] Cho SA, Kim TH, Sung AY, J. Korean Chem. Soc., 55, 283 (2011)

[3] Brennan NA, Eforn N, Holden BA, Ophthalmic Physiol. Opt., 7, 485 (1987)

[4] Brennan NA, J. Int. Contact Lens Clin., 10, 357 (1983)

[5] Mousa GY, Callender MG, Sivak JG, Edan DJ, J. Int. Contact Lens Clin., 10, 31 (1983)

[6] Kim TH, Ye KH, Sung AY, J. Korean Chem. Soc., 53, 755 (2009)

[7] Kim TH, Sung AY, J. Korean Chem. Soc., 54, 317 (2010)

[8] Kanaze FI, Kokkalou E, Niopas I, Barmpalexis P, Georgarakis E, Bikiaris E, Drug Dev. Ind. Pharm., 36, 292 (2007)

[9] Han IS, lim YM, Kwon HJ, Park JS, No YC, Polymer, 35, 13 (2011)

[10] Chun YS, J. Korean Med. Assoc., 50, 842 (2007)

[11] Zheng MP, Gu MY, Jin YP, Wang HH, Zu PF, Tao P, He JB, Mater. Sci. Eng., B87, 197 (2001)

[12] Thirugnanam T, J. Nanomater., 2013, 7 (2013)

[13] Zhang Z, Zhao B, Hu L, J. Solid State Chem., 121, 105 (1996)

[14] Wang DN, Dimonie VL, Sudol ED, El-Aasser MS, J. Appl. Polym. Sci., 84(14), 2721 (2002)

[15] General Standard for Biological Safety of Medical Devices (KFDA Notification No. 2014-115).

[16] International Organization for Standardization, 2006, Ophthalmic optics contact lenses . Part 4: Physicochemical properties of contact lens materials, ISO 18369-4.

[17] Efron N, Morgan PB, Optom. Vis. Sci., 84, E328 (2007)

[18] Maldonado-Codina C, Efron N, Optometry in Practice, 4, 101 (2003).