Simultaneous interpenetrating network silicone hydrogels prepared by free radical/cationic hybrid polymerization

2012 ◽  
Vol 127 (3) ◽  
pp. 2235-2242 ◽  
Author(s):  
Jing Jing Wang ◽  
Fang Liu
Keyword(s):  
Free Radical ◽  
Interpenetrating Network ◽  
Silicone Hydrogels ◽  
Hybrid Polymerization

SILICONE HYDROGELS WITH INTERPENETRATING NETWORK STRUCTURE PREPARED BY SIMULTANEOUS FREE-RADICAL/CATIONIC HYBRID POLYMERIZATIONS

2011 ◽  
Vol 23 (02) ◽  
pp. 153-162 ◽  
Author(s):  
Xinsong Li ◽  
Jingjing Wang ◽  
Yao Chen
Keyword(s):  
Free Radical ◽  
Uv Spectroscopy ◽  
Triethylene Glycol ◽  
Radical Mechanism ◽  
Ion Permeability ◽  
Interpenetrating Network ◽  
Physiochemical Properties ◽  
Tensile Tester ◽  
Free Radical Mechanism ◽  
Silicone Hydrogels

Silicone hydrogels with interpenetrating network (IPN) structure were prepared by ultraviolet (UV)-initiated simultaneous free-radical/cationic polymerizations in order to develop contact lens with high performances. The polymerization mechanism was investigated by gel fraction method using polymerization of 2-hydroxyethyl methacrylate (HEMA) and 4-hydroxybutyl vinyl ether (HBVE) as a model. The results showed that HEMA and crosslinker ethylene glycol dimethacrylate (EGDMA) polymerized by free-radical mechanism, while HBVE and crosslinker triethylene glycol divinyl ether (DVE-3) polymerized by cationic mechanism. The IPN silicone hydrogels were then prepared by UV-initiated hybrid photopolymerization of monomers including HEMA and bitelechelic polydimethylsiloxane bearing vinyl ethers end-groups (VS) in the presence of free-radical and cationic photoinitiators. Physiochemical properties such as optical properties, ion permeability, contact angle, and mechanical properties of the silicone hydrogels were characterized by UV spectroscopy, ionoflux technique, and tensile tester. The results revealed that the water content, surface wettability, and ion permeability of the hydrogels increased, but the tensile strength and Young's modulus decreased with the increase of the HEMA content.

scholarly journals The influence of water on visible-light initiated free-radical/cationic ring-opening hybrid polymerization of methacrylate/epoxy: polymerization kinetics, crosslinking structure and dynamic mechanical properties

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 77791-77802 ◽  
Author(s):  
Xueping Ge ◽  
Qiang Ye ◽  
Linyong Song ◽  
Anil Misra ◽  
Paulette Spencer
Keyword(s):  
Mechanical Properties ◽  
Free Radical ◽  
Visible Light ◽  
Network Structure ◽  
Ring Opening ◽  
Crosslinking Density ◽  
Dynamic Mechanical Properties ◽  
Hydroxyl Groups ◽  
Influence Of Water ◽  
Hybrid Polymerization

During the photopolymerization, water will compete with hydroxyl groups in methacrylates to react with epoxy and reduce the apparent crosslinking density of the network structure.

Novel phenylamine‐based oxime ester photoinitiators for LED ‐induced free radical, cationic, and hybrid polymerization

2021 ◽  
Author(s):  
Fatima Hammoud ◽  
Zhong‐Han Lee ◽  
Bernadette Graff ◽  
Akram Hijazi ◽  
Jacques Lalevée ◽  
...  
Keyword(s):  
Free Radical ◽  
Hybrid Polymerization

Studies on the initiation of a free-radical condensation hybrid polymerization system

2000 ◽  
Vol 79 (7) ◽  
pp. 1195-1200 ◽  
Author(s):  
Xiaoyin Hong ◽  
Qidao Chen ◽  
Ming Chen ◽  
Rongzhen Yu ◽  
Jing Chen
Keyword(s):  
Free Radical ◽  
Polymerization System ◽  
Hybrid Polymerization

scholarly journals Copolymerization of ring-opening oxaspiro comonomer with denture base acrylic resin by free-radical/cationic hybrid polymerization

2021 ◽  
Vol 13 (5) ◽  
pp. 527
Author(s):  
Ranganathan Ajay ◽  
Vikraman Rakshagan ◽  
Murugesan Sreevarun ◽  
Dharanividhya Bhuvaneshkumar ◽  
Sekaran SajidaBegum ◽  
...  
Keyword(s):  
Free Radical ◽  
Ring Opening ◽  
Acrylic Resin ◽  
Denture Base ◽  
Hybrid Polymerization

scholarly journals Bioinspired-Interpenetrating Network (IPNs) Hydrogel (BIOF-INPs) and TMD <i>in Vitro</i>: Bioadhesion, Drug Release and Build in Free Radical Detection and Defense

2015 ◽  
Vol 05 (03) ◽  
pp. 53-61 ◽  
Author(s):  
Victoria Tamara Perchyonok ◽  
Vanessa Reher ◽  
Nicolaas J. Basson ◽  
Shengmiao Zhang ◽  
Sias R. Grobler
Keyword(s):  
Free Radical ◽  
Drug Release ◽  
Interpenetrating Network ◽  
Radical Detection
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