Studies on Development of Polymeric Materials Using Gamma Irradiation for Contact and Intraocular Lenses

Autor: Pranshu Chhabra, Ruchi Gupta, Gunjan Suri, Mukti Tyagi, Geetha Seshadri, S. Sabharwal, U. K. Niyogi, R. K. Khandal
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Zdroj: International Journal of Polymer Science, Vol 2009 (2009)
Druh dokumentu: article
ISSN: 1687-9422
1687-9430
DOI: 10.1155/2009/906904
Popis: For the development of materials for contact lenses and intraocular lenses, the selection criteria is based on the (i) capacity to absorb and retain water, (ii) hydrophilicity and hydrophobicity, (iii) refractive index and (iv) hardness besides the other essential properties. Various monomers are being studied to develop suitable materials for such applications. Selection of suitable monomers that can be converted into optical materials of desired characteristics is the most essential step. In the present paper, an attempt has been made to develop suitable optical polymers based on 2-hydroxy ethyl methacrylate (HEMA), N-vinyl pyrrolidone (NVP), methyl methacrylate (MMA), methacrylic acid (MAA), and styrene. Compositions were prepared in such a way that polymers of varying hydrophilicity or hydrophobicity could be obtained keeping HEMA as the base (main) monomer. For polymerization, gamma irradiation (Co-60 as a source) was used. The results of the study showed that: (i) an increase in NVP and MAA content brought in an increase in hydrophilicity of polymerized HEMA (pHEMA), while the addition of styrene and MMA decreased hydrophilicity of polymerized HEMA (pHEMA), (ii) polymers for contact lenses with water retention capacity as high as >50 wt.% and as low as
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