Abstract

To investigate the influence of crosslinking density and free polysiloxane chain length on oxygen permeability and hydrophilicity of multicomponent silicone hydrogels, two kinds of silicone macromonomers, single methacrylate terminated silicone macromonomers (PDMS-1) and double methacrylate terminated silicone macromonomers (PDMS-2), were synthetized, respectively. Then, a series of multicomponent silicone hydrogels with different crosslinking densities and free polysiloxane chain lengths were prepared by copolymerization of obtained silicone macromonomers, silicone monomer tris(trimethylsiloxy)-3-methacryloxpropylsilane (TRIS), and hydrophilic monomers. The oxygen permeability coefficient (Dk), equilibrium water content (EWC), light transmittance, and mechanical properties of silicone hydrogels were characterized. The results indicated that the longer free polysiloxane chain was beneficial to the increase of Dk values and EWC of silicone hydrogels. With the increase of crosslinking density, the Dk values and EWC of the silicone hydrogels decreased. This work provided a new idea for the preparation of high-permeability silicone hydrogels in the future.

Graphical abstract

中文翻译：

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交联密度和游离聚硅氧烷链长对多元硅水凝胶透氧性和亲水性的影响研究

摘要

为了研究交联密度和游离聚硅氧烷链长对多组分有机硅水凝胶的透氧性和亲水性的影响，两种有机硅大分子单体，单甲基丙烯酸酯封端的有机硅大单体（PDMS-1）和双甲基丙烯酸酯封端的有机硅大单体（PDMS-2），分别合成。然后，通过获得的有机硅大分子单体、有机硅单体三（三甲基甲硅烷氧基）-3-甲基丙烯酰氧基丙基硅烷（TRIS）和亲水性单体共聚制备了一系列具有不同交联密度和游离聚硅氧烷链长的多组分有机硅水凝胶。表征了硅水凝胶的透氧系数（Dk）、平衡含水量（EWC）、透光率和机械性能。结果表明，较长的游离聚硅氧烷链有利于提高硅水凝胶的 Dk 值和 EWC。随着交联密度的增加，硅水凝胶的 Dk 值和 EWC 降低。该工作为今后制备高渗透性硅水凝胶提供了新思路。

图形概要