Journal
COLLOID AND POLYMER SCIENCE
Volume 299, Issue 8, Pages 1327-1335Publisher
SPRINGER
DOI: 10.1007/s00396-021-04850-5
Keywords
Silicone hydrogels; Silicone macromonomer; Free polysiloxane chain length; Crosslinking density; Oxygen permeability
Categories
Funding
- National Natural Science Foundation of China [21374016, 21304018]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The study investigated the influence of crosslinking density and free polysiloxane chain length on oxygen permeability and hydrophilicity of multicomponent silicone hydrogels. It was found that longer free polysiloxane chains lead to higher oxygen permeability and equilibrium water content, while increasing crosslinking density decreases these properties. This work provides a new perspective for the preparation of high-permeability silicone hydrogels in the future.
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.
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