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首页> 外文期刊>Polymers for advanced technologies >New silicone hydrogels based on interpenetrating polymer networks comprising polysiloxane and poly(vinyl alcohol) networks
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New silicone hydrogels based on interpenetrating polymer networks comprising polysiloxane and poly(vinyl alcohol) networks

机译：基于互穿聚合物网络的新型有机硅水凝胶，包括聚硅氧烷和聚乙烯醇网络

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A method for the synthesis of a new silicone hydrogel as a biphase material for soft contact lenses is considered. The method is based on the synthesis of sequential interpenetrating polymer networks (IPN) and includes the following stages: (1) cross-linked silicone synthesis by the reaction of vinyl- and hydride-containing oligosiloxanes; (2) silicone network saturation with vinyl acetate and cross-linking monomer followed by UV-initiated polymerization to form an IPN comprising the silicone and cross-linked poly(vinyl acetate) (PVAc) network; (3) PVAc network alcoholysis with methanol to obtain silicone hydrogels comprising the silicone and cross-linked poly(vinyl alcohol) (PVAl). A study of hydrophilic, optical, mechanical, and structural features of the silicone hydrogels showed that optical transparency is achieved for materials with the highest density of silicone network cross-linking where the size of IPN structural units does not exceed 100 nm. The water content in hydrophilic networks of silicone hydrogel is found to be below the values typical of cross-linked PVAl, leading to non-additivity of IPN mechanical properties. Indeed, the elasticity moduli (E) of the hydrophilic and silicone networks are 0.4-0.7 and 0.7-1.8 MPa, respectively, whereas for some IPN this value reaches 3.0MPa. The optimal parameters of synthesis providing the reduction of E to 0.8-1.6 MPa without deterioration of the required performance characteristics (optical transparency 90-92%, water content 20-39 wt%) are determined.
机译：考虑了一种合成新的有机硅水凝胶作为软性隐形眼镜的双相材料的方法。该方法基于顺序互穿聚合物网络（IPN）的合成，并且包括以下步骤：（1）通过含乙烯基和氢化物的低聚硅氧烷的反应来交联的硅氧烷合成; （2）用乙酸乙烯酯和交联单体使硅酮网络饱和，然后通过UV引发的聚合反应形成包含硅酮和交联的聚乙酸乙烯酯（PVAc）网络的IPN; （3）PVAc与甲醇的网络醇解，得到包含有机硅和交联的聚（乙烯醇）（PVA1）的有机硅水凝胶。对有机硅水凝胶的亲水，光学，机械和结构特征的研究表明，对于IPN结构单元尺寸不超过100 nm的有机硅网络交联密度最高的材料，可以实现光学透明性。发现硅氧烷水凝胶的亲水网络中的水含量低于交联的PVAl的典型值，从而导致IPN机械性能的非可加性。实际上，亲水和硅氧烷网络的弹性模量（E）分别为0.4-0.7和0.7-1.8 MPa，而对于某些IPN，该值达到3.0 MPa。确定了最佳的合成参数，该参数可将E降低至0.8-1.6 MPa，而不会降低所需的性能（光学透明度为90-92％，水含量为20-39 wt％）。

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