The role of bulky polysiloxanylalkyl methacrylates in polyurethane–polysiloxane hydrogels

✍ Scribed by Yu-Chin Lai

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 528 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960523)60:8<1193::aid-app12>3.0.co;2-3

✦ Synopsis

Silicone hydrogels based on polyurethane-polysiloxane prepolymers and hydrophilic monomers such as N,N-dimethylacrylamide, although possessing high oxygen permeability and satisfactory tear strength, are too stiff to be targeted for applications such as contact lenses. However, with the inclusion of bulky polysiloxanylalkyl methacrylates, such as methacryloxypropyl tris(trimethylsi1oxy)silane (TRIS), to replace part of the polyurethane prepolymer, the hydrogels obtained not only maintained high oxygen permeability, but also had a lower modulus and improved tear strength. These changes in properties are all favorable for applications such as oxygen-permeable hydrogel lenses.