Hydrogels preparation

Unsaturated polyester resins (UPRs) Uralkyd resins, 202 Urea-methylol reaction, 410 Urethane alkyds, 241 Urethane coatings, 202 Urethane elastomers, implanted, 207 Urethane foams, tests for, 244 Urethane gels, 205 Urethane-grade ATPEs, 223 Urethane-grade polyol types, 212 Urethane-grade raw materials, 246 Urethane hydrogel, preparation of, 250-251... [Pg.604]

Silicone rubber-hydrogel composite is a two-phase system that is capable of swelling in water. The hydrogels prepared have different chemical compositions, size and shape of particles, and correspondingly different specific surfaces. It was found that the mechanical properties of silicone rubber-hydrogel composites depend mostly on the magnitude of the contact surface of both phases. ... [Pg.245]

R Kishi, O Hirasa, H Ichijo. Fast responsive poly(N-isopropylacrylamide) hydrogels prepared by gamma-ray irradiation. Polym Gels Networks 5 145-151, 1997. [Pg.551]

The change of chemical potential due to the elastic retractive forces of the polymer chains can be determined from the theory of rubber elasticity (Flory, 1953 Treloar, 1958). Upon equaling these two contributions an expression for determining the molecular weight between two adjacent crosslinks of a neutral hydrogel prepared in the absence of... [Pg.79]

Peppas and Merrill (1977) modified the original Flory-Rehner theory for hydrogels prepared in the presence of water. The presence of water effectively modifies the change of chemical potential due to the elastic forces. This term must now account for the volume fraction density of the chains during crosslinking. Equation (4) predicts the molecular weight between crosslinks in a neutral hydrogel prepared in the presence of water. [Pg.80]

Here, only the form of rubber elasticity theory used to analyze the structure of hydrogels prepared in the presence of a solvent is presented... [Pg.81]

Szepes, A., Makai, Z., Bliimer, C., Mader, K., Kasa, P. Jr., Szabo-Revesz, P. (2008). Characterization and drug delivery behaviour of starch-based hydrogels prepared via isostatic ultrahigh pressure. Carbohydr. Poly., 72(4), 571-578. [Pg.462]

Hydrogels prepared from poly(ethylene glycol) diacrylate macromonomer having an Mn of 20,000 Da were used by Sawhney et aL (2) for hydrogel articles for sealing or for augmentation of tissue or vessels. [Pg.497]

De Leede, L.G.J., et al. 1986. Rate-controlled rectal delivery in man with a hydrogel preparation. J Control Rel 4 17. [Pg.145]

Lin, S.Y., and J.C. Yang. 1990. Effect of 3-cyclodextrin on the in vitro permeation rate and in vivo rectal absorption of acetaminophen hydrogel preparations. Pharm Acta Helv 65 262. [Pg.167]

Hydrogels prepared via homogeneous esterification of dextran with unsaturated carboxylic acids are advanced polysaccharide-based products useful for drug delivery systems and protective encapsulants, e.g. of viruses used in gene therapy [173]. Very promising in this regard is the dextran maleic acid monoester [174], which can be obtained by conversion of dextran in DMF/LiCl with the maleic anhydride in the presence of TEA. The DS of the products can be easily controlled with the amount of anhydride applied but... [Pg.230]

Porous silica is one of the different forms of amorphous silica. It can be prepared by acidification of basic aqueous silicate solutions, and when reaction conditions are properly adjusted, porous silica gels are obtained [150], If water is evaporated from the pores of silica hydrogels prepared in this fashion, porous xerogels are obtained [153],... [Pg.84]

In order to reduce the pH values of hydrogels prepared from water glass, an appropriate amount of sulfuric acid was added. [Pg.252]

TABLE 1. Properties of hydrogels prepared by free radically polymerizing the corresponding triacrylate with 2,2 -azobisamidinopropane dihydrochloride. [Pg.263]

Eiselt, P., Lee, K. Y, and Mooney, D. J. 1999. Rigidity of two-component hydrogels prepared from alginate and polyfethylene glycolj-diamines. Macromolecules 32(17) 5561-5566. [Pg.393]

These relationships are commonly employed to determine Me in characterization studies of nonresponsive and responsive hydrogel preparations where the response does not lead to a change in cross-link density. [Pg.483]

Chen YE and Yi M. SweUing kinetics and stimuli-responsiveness of poly (DMAEMA) hydrogels prepared by UV-rrradiation. Radiation Physics and Chemistry 2001 61 65-68. [Pg.490]

Zhang R. Dextran Hydrogel Preparation and Application in Biomedical Engineering. PhD Thesis, University of Bath, England, 2004. [Pg.491]

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