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<p>Colorless, transparent aramids were synthesized using bis(trifluoromethyl)benzidine (TFMB) as a fluorinated diamine monomer and isophthaloyl chloride (IPC) as a dicarboxylic chloride monomer, either alone or in a mixture with terephthaloyl chloride (TPC). These polymers were added as a reinforcing agent to <i>N,N</i>-diethylacrylamide (DEA) to manufacture contact lenses. Lenses containing TFMB-IPC aramid at 11 wt% or more maintained their shape stably after hydration and showed no clouding due to thermally induced phase separation at 35&#xa0;°C, the normal ocular surface temperature. As the aramid content increased, the water content (min. 36.1%) of the lens decreased, and the water contact angle measured on the lens surface (max. 78.6°) increased, which significantly enhanced the hydrophobicity of both the bulk and the surface of the lens. The tensile strength (max. 17.96&#xa0;MPa) and elastic modulus (max. 67.13&#xa0;MPa) also increased with the aramid content, so these lenses were not easily torn. As the aramid content increased, the refractive index (max. 1.435) increased, and the light transmittance at 420&#xa0;nm (min. 84.30%) decreased, showing the usefulness of the lens and its potential UV-blocking function. Although the oxygen transmissibility of the lens decreased with an increase in the amount of aramid, the lenses floated on the tear layer in a simulation experiment, facilitating tear exchange.</p> Graphical abstract <p>Diethylacrylamide-based contact lens is prepared using aramid as reinforcing agent. Some lenses remain stable in shape and do not become cloudy after hydration. As the aramid content increases, the hydrophobicity and tensile strength increase. At the same time, the refractive index increases, and UV/blue lights are blocked. The lens floats on the tear layer, facilitating tear exchange.</p> <p></p>

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Colorless, transparent aramid-reinforced and hydrophobized hydrogel contact lenses floating on tear layer

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Hanna Lee,
  • Giseop Kwak

摘要

Colorless, transparent aramids were synthesized using bis(trifluoromethyl)benzidine (TFMB) as a fluorinated diamine monomer and isophthaloyl chloride (IPC) as a dicarboxylic chloride monomer, either alone or in a mixture with terephthaloyl chloride (TPC). These polymers were added as a reinforcing agent to N,N-diethylacrylamide (DEA) to manufacture contact lenses. Lenses containing TFMB-IPC aramid at 11 wt% or more maintained their shape stably after hydration and showed no clouding due to thermally induced phase separation at 35 °C, the normal ocular surface temperature. As the aramid content increased, the water content (min. 36.1%) of the lens decreased, and the water contact angle measured on the lens surface (max. 78.6°) increased, which significantly enhanced the hydrophobicity of both the bulk and the surface of the lens. The tensile strength (max. 17.96 MPa) and elastic modulus (max. 67.13 MPa) also increased with the aramid content, so these lenses were not easily torn. As the aramid content increased, the refractive index (max. 1.435) increased, and the light transmittance at 420 nm (min. 84.30%) decreased, showing the usefulness of the lens and its potential UV-blocking function. Although the oxygen transmissibility of the lens decreased with an increase in the amount of aramid, the lenses floated on the tear layer in a simulation experiment, facilitating tear exchange.

Graphical abstract

Diethylacrylamide-based contact lens is prepared using aramid as reinforcing agent. Some lenses remain stable in shape and do not become cloudy after hydration. As the aramid content increases, the hydrophobicity and tensile strength increase. At the same time, the refractive index increases, and UV/blue lights are blocked. The lens floats on the tear layer, facilitating tear exchange.