Glycerol methacrylate

The water content of a hydrogel depends on the hydrophilicity of the monomer, eg, cured poly(HEMA) absorbs 60% of its weight of water and thus forms a hydrogel with about 38% water content. Other hydrophilic monomers, such as A/-vinylpyrrohdinone [88-12-0] (NVP) (6), and glycerol methacrylate [100-92-5] (GM) (7), and acrylamide monomers, such as diacetone acrylamide [2873-94-9] (DAA), have also been used to form hydrogels with higher water content. 

Polyurethane hydrogels derived from UV curable urethane prepolymer and hydrophilic monomers were prepared and their properties were evaluated. The urethane prepolymer used in this study contained well-defined hard segments centered with a polyether-based soft segment and end-capped with methacrylate groups. The hydrophilic monomers studied were 2-hydroxyethyl methacrylate (HEMA), N-vinyl pyrrolidone, and glycerol methacrylate. Methacryloxypropyl tris(trimethysiloxy) silane (TRIS) was also used in some cases to modify properties. All compositions were UV... 

Cross-linked pre-polymers having fractionalized molecular weights between 35,000 and 70,000 daltons with polydispersity indexes of less than 3.4 have been prepared by the free radical addition of 2-hydroxethyl methacrylate, HEMA, with 2% methacrylic acid or glycerol methacrylate. Once crosslinked, these materials are particularly useful as contact lenses because of their limited shrinkage and expansion. 

Poly(2-hydroxethyl methaciylate-co-glycerol methacrylate) was also prepared having a molecular weight of 41,000 daltons with a PDI of 2.80. 

YNTHETIC HYDROGEL POLYMERS, first introduced in the early 1960s, made a major impact, initially in the soft contact lens field, and more recently in other biomedical or specialty applications. The first synthetic poly(2-hy-droxyethyl methacrylate) [poly(HEMA)] hydrogel developed by Wichterle (i) remains very important, as do its copolymers with monomers such as N-vinyl-2-pyrrolidinone, acrylic and methacrylic acids, glycerol methacrylate, various acrylamides, and alkoxyalkyl methacrylates. 

H. Gao, M. C. Jones, P. Tewari, M. Ranger and J. C. Leroux, Star-shaped alkylated poly(glycerol methacrylate) reverse micelles synthesis and evaluation of their solubilizing properties in dichloromethane. /. Polym. Sci. Polym. Chem., 45, 2425-2435 (2007). 

For carbon nanotubes, organosoluble PS-SWCNT nanocomposites [292] have been prepared that could be efficiently transformed to highly hydrosoluble, pH-responsive materials via direct sulfonation of the grafted PS chains [296]. In another approach, MWCNT-C H was clicked with azide-functionalized poly(glycerol methacrylate) and the final hairy MWCNTs were used for the in situ synthesis and immobilization of monodisperse 3 nm-sized palladium nanoparticles. The final heterostructure had a high catalytic activity (77%) for the C-C coupling Suzuki reaction between 4-bromobenzene and phenyl boronic acid [293],... 

Poly(ethylene teiephthalate), 393 Poly(L-glutamic acid), 258 Poly(glycerol methacrylate) (PGMA), 219 Poly(2-hydroxyethyl acrylate) (PHEA), 220 Poly(2-hydroxyethyl methaciylate) (PHEMA), 120-1, 206, 248... 

SCL Nonwater-containing SCL Water-containing SCL Water content < 40 % Water content 40-60 % Water content > 60 % Silicone-type elastomers Acrylic-type elastomers Homopolymers or copolymers of 2-hydroxyethyl methacrylate (HEMA) Copolymers of HEMA, N-vinyl pyrrolidone (NVP), methacrylic acid (MA) and MAA Copolymers mainly from MMA and glycerol methacrylate (GMA) Other Copolymers mainly from MMA, NVP, acrylamide (AAm)... 

Moist SCL Low moisture content less than 40% Poly(hydroxyethylmethacrylate) Middle moisture content 40-60% Copolymer of hydroxyethylmethacrylate, A -vinylpyrrolidone, methacrylic acid, and methylmethacrylate Copolymer of methylmethacrylate and glycerol methacrylate High moisture content more than 60% Copolymer of A -vinylpyrrolidone, dimethylacrylamide, and methylmethacrylate... 

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