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The role of bulky polysiloxanylalkyl methacrylates in polyurethane–polysiloxane hydrogels
Author(s) -
Lai YuChin
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960523)60:8<1193::aid-app12>3.0.co;2-3
Subject(s) - prepolymer , oxygen permeability , polyurethane , materials science , silane , polymer chemistry , self healing hydrogels , methacrylate , silicone , swelling , monomer , composite material , chemical engineering , oxygen , polymer , chemistry , organic chemistry , engineering
Silicone hydrogels based on polyurethane–polysiloxane prepolymer 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(trimethylsiloxy)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. © 1996 John Wiley & Sons, Inc.