The effect of polymer structure on durability of high dk rigid gas-permeable materials

Yokota, Mitsuru; Goshima, Tsutomu; Itoh, Shin

doi:10.1016/s0141-7037(92)80056-6

Cited by 6 publications

(4 citation statements)

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“…Therefore, these results correspond well with our previous report. 10 MMA copolymers with a higher PDMS content showed higher values of T 1 H at peak (a), as shown in Figure 3a. Alternatively, TFEMA copolymers with a higher PDMS content, T446, showed lower T 1 H values.…”

Section: Cp-mas Spectramentioning

confidence: 76%

“…This shows good correspondence to our previous report that described a material with a microheterophase structure with a high M n that showed a higher oxygen permeability than a material made from a low-molecular-weight silicone constituent. 10 Comparison of T 1 values from the copolymer and pristine polymer The measured T 1 H , T 1r H , T 1 C and T 1r C values of pristine PDMS (I), PMMA (I) and PTFEMA (II) are shown with those of the copolymer in Figure 3a, b, c and d. The T 1 H , T 1r H , T 1 C and T 1r C values of pristine PDMS are clearly different from those of copolymerized PDMS. Furthermore, comparing the T 1 values of pristine PMMA and PTFEMA with those of copolymerized PMMA and PTFEMA, a composition dependency of the T 1 values can be seen.…”

Section: Cp-mas Spectramentioning

confidence: 99%

“…The materials showed very high oxygen permeability and durability when compared with a material with a low-M n silicone constituent and that was as uniform a structure as contact lens material. 10 In addition, it has been reported that the copolymerization of the perfluoroalkyl ester group-bearing monomer with PDMS-containing material caused an increase in oxygen permeability. 11 However, further analysis of microstructures of the copolymers is required at the molecular level to develop a copolymer material with superior characteristics.…”

Section: Introductionmentioning

confidence: 99%

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The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

Yokota

Miwa

Ajiro

et al. 2012

Polym J

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Section: Cp-mas Spectramentioning

confidence: 76%

Section: Cp-mas Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

Yokota

Miwa

Ajiro

et al. 2012

Polym J

Self Cite

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“…It was made up of a silicone-incroported monomer to increase Dk. This process worked well where Chemists have developed these lenses by increasing the proportion of silicon content to increase the surface wettability and lens Dk [16]. Due to RGP CL rigidity, it causes corneal reshaping, which was useful for some post-surgery curing [17,18].…”

Section: Introductionmentioning

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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Transmission electron microscopic observations of the multilevel microstructure of crosslinked copolymers with methacrylates and siloxane macromers by a radically polymerizable tuning approach

Yokota

Ajiro

Akashi

2012

J of Applied Polymer Sci

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We investigated by Transmission Electron Microscopy (TEM) the morphologies of crosslinked copolymers from methacrylate monomers from methylmethacrylate (MMA) and trifluoroethylmethacrylate (TFEMA), polydimethylsiloxane (PDMS) macromers with molecular weight (Mn) of 1,700 and 4,700 g/mol, and crosslinker. Depending on the PDMS content, we observed, spherical PMMA islands in which small PDMS domains were dispersed, PMMA continuous phase, closely packed PTFEMA islands, and homogeneously dispersed PDMS domains were observed with low or middle magnification. Fine observation at 100,000‐fold magnification revealed the “fundamental” common size domain, which was determined by the Mn value of the PDMS macromer. Thus we found two microstructure types: (1) a “fundamental domain” due to the Mn of the PDMS macromer, and (2) an aggregated domain. The former was constant under all conditions, but the latter was affected by the comonomer and its ratio. The present results are essential in understanding the chemical and physical characteristics of crosslinked copolymers from PDMS macromers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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The effect of polymer structure on durability of high dk rigid gas-permeable materials

Cited by 6 publications

References 0 publications

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

The systematic study of the microstructure of crosslinked copolymers from siloxane macromonomers and methacrylates by changes in composition and components

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

Transmission electron microscopic observations of the multilevel microstructure of crosslinked copolymers with methacrylates and siloxane macromers by a radically polymerizable tuning approach

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