Novel way of making high refractive index plastics; metal containing polymers for optical applications

Tyagi, Mukti; Suri, Gunjan; Chhabra, Pranshu; Seshadri, Geetha; Malik, Amita; Aggarwal, Shruti; Khandal, Rakesh Kumar

doi:10.1515/epoly.2009.9.1.1197

Cited by 14 publications

(13 citation statements)

References 76 publications

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“…The designing of optical plastics involves three approaches, that is, (i) developing a new chemistry with molecular bonds of unique optical properties as well as physicomechanical behavior [16,17], (ii) trying combinations of several homopolymers or copolymers with synergistic properties [18,19], and (iii) combining inorganics with organics to achieve properties derived from the complementary effects of two different (organic and inorganic) base materials [20,21]. Each of these approaches has resulted in unexpected success with the advent of newer materials, besides providing various leads for researchers to pursue further for improved products.…”

Section: Introductionmentioning

confidence: 99%

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

Chhabra

Gupta

Suri

et al. 2009

International Journal of Polymer Science

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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 <10 wt% with varying content of suitable comonomers can be designed, (iii) polymeric materials for contact lenses can be made by using radiation processing such as Co-60 and (iv) a dose of 40 kGy was found to be ideal for purpose.

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Section: Introductionmentioning

confidence: 99%

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

Chhabra

Gupta

Suri

et al. 2009

International Journal of Polymer Science

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“…Poly(thiourethane)s, poly(thioester)s and poly(thiocarbonate)s have been synthesized and investigated mainly as potential plastics with high thermal and chemical resistance, as well as with high refractive index for optical applications (i.e., lenses and optical fibers) [1,[4][5][6][7].…”

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confidence: 99%

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

Rogulska

Kultys

Olszewska

2013

J Therm Anal Calorim

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Two series of new thermoplastic poly(thiourethane-urethane) elastomers (EPTURs), with different hardsegment content (40-60 wt%), were synthesized by a onestep melt polymerization from poly(oxytetramethylene) diol (PTMO) of M n = 1,000 g mol -1 or poly(hexamethylene carbonate) diol (PHCD) of M n = 860 g mol -1 as a soft segment, hexane-1,6-diyl diisocyanate and (methylenedi-1,4-phenylene)dimethanethiol as a chain extender at the NCO/(OH ? SH) molar ratio of 1. The structures of all the EPTURs were examined by Fourier transform infrared spectroscopy (FTIR), atomic force microscopy and X-ray diffraction analysis. Their thermal behavior was investigated by means of differential scanning calorimetry and thermogravimetric analysis (TG). For the chosen polymers the gaseous products evolved during the decomposition process were analyzed by TG-FTIR. Moreover, physicochemical, adhesive and tensile properties as well as Shore A/D hardness were determined. The resulting highmolecular-mass EPTURs were stable up to 254-262°C, as measured by the temperature of 1 % mass loss. They decomposed in three or four stages. The main decomposition products were carbonyl sulfide, isocyanate, carbon dioxide, aromatic hydrocarbons as well as aliphatic ethers and aldehydes (in PTMO series) and alcohols (in PHCD series). All the polymers showed partially crystalline structures, associated with crystallization of thiourethane hard segments. Their melting temperatures were in the range of 184-186°C. The PTMO series EPTURs exhibited better low-temperature properties (glass-transition temperature in the range of -64 to -44 vs. -26 to -22°C), but poorer tensile strengths (20-28 vs. 37-43 MPa). These EPTURs showed improved adhesive properties in comparison with their polyurethane analogs.

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“…In the following text we discuss the development and improvement of polymers used in optical applications in terms of permeability, refraction and dispersion properties. A group of researchers has reached several types of optical plastics [22,23] [27].…”

Section: Optical Polymers Used To Improve the Contact Lenses Optical Propertiesmentioning

confidence: 99%

Plastic Materials for Modifying the Refractive Index of Contact Lens: Overview

Amiery

2019

RDMS

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Contact lenses (CLs) are produced from optical polymers which recommended by experts to treat the refractive errors. Researchers are looking for ideal materials in order to improve the CLs optical qualities. This investigation gathers polymeric materials merits to choose the desired pure or doped polymer for the purpose of CLs manufacturing.Methods: high performance CLs can be made of polymers with high transparency nanocomposite because of the need for optical plastic merits such as light weight, transparency, Biocompatibility, the ability to modify its refractive index and abbe number.Results: TiO 2 -PMMA and TiO 2 -PHEMA nanocomposites can be considered the best candidate polymers in CLs fabrication due to its optical properties where it possesses RI higher than 1.52, νd of 30-54, transmittance higher than 92% and its flexibility and biocompatibility to the human eye tissues. Conclusion:this article demonstrates the advancement of polymer properties utilized in optical applications focusing on RIs, νd and visible light transmittance of the optical plastics that can be utilized in the CLs manufacture or evolution of them.

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Novel way of making high refractive index plastics; metal containing polymers for optical applications

Cited by 14 publications

References 76 publications

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

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

New thermoplastic poly(thiourethane-urethane) elastomers based on hexane-1,6-diyl diisocyanate (HDI)

Plastic Materials for Modifying the Refractive Index of Contact Lens: Overview

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