Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Poly gels preparation

Fig. 137.—Equilibrium swelling ratio qm of poly-(methacrylic acid) gels prepared by copolymerizing methacrylic acid with 1, 2, and 4 percent (upper, middle, and lower curves, respectively) of divinylbenzene plotted against degree of neutralization i with sodium hydroxide. (Katchalsky, Lifson, and Eisenberg. )... Fig. 137.—Equilibrium swelling ratio qm of poly-(methacrylic acid) gels prepared by copolymerizing methacrylic acid with 1, 2, and 4 percent (upper, middle, and lower curves, respectively) of divinylbenzene plotted against degree of neutralization i with sodium hydroxide. (Katchalsky, Lifson, and Eisenberg. )...
Figure 7.13 Schematic representation of the structure of a cross-linked MSP gel prepared by Loveless and coworkers (Yount et al. 2005 Loveless et al. 2007) from poly(vinyl pyridine) (PVP) cross-linked with bis-Pd - or Pt -pincer compounds (18 and 19). Figure 7.13 Schematic representation of the structure of a cross-linked MSP gel prepared by Loveless and coworkers (Yount et al. 2005 Loveless et al. 2007) from poly(vinyl pyridine) (PVP) cross-linked with bis-Pd - or Pt -pincer compounds (18 and 19).
In spite of the constant density of the gel, the friction of the poly(N-isopropylacrylamide) gel reversibly decreases by three orders of magnitude and appears to diminish as the gel approaches a certain temperature. This phenomenon should be universal and may be observed in any gel under optimal experimental conditions of the solvent composition and the temperature because the unique parameter describing the friction is the correlation length which tends to diverge in the vicinity of the volume phase transition point of gels. The exponent v for the correlation length obtained from the frictional experiment is far from the theoretical value. It will, therefore, be important to study a poly(N-isopropylacrylamide) gel prepared at the critical isochore where the frictional property of gel may be governed by the critical density fluctuations of the gel. [Pg.46]

Takamura A, Ishii T, Hidaka H (1992) Drug release from poly(vinyl alcohol) gel prepared by freeze-thaw procedure. J Control Release 20 21... [Pg.196]

Peppas NA, Scott JE (1992) Controlled release from poly(vinyl alcohol) gels prepared by freezing-thawing processes. J Control Release 18 95... [Pg.196]

Tirumala, V, Guo, L., Caneba, G. T., Mancini, D., Thiyagarajan, R, and Barker, J. G., 2004c. USANS Investigation of Poly(N-isopropylaciylamide) Gels prepared from Synchrotron-... [Pg.250]

Takenaka S., Kozuka H. Sol-gel preparation of single-layer, 0.75 /xm thick lead zirconate titanate films from lead nitrate-titanium and zirconium alkoxide solutions containing poly vinylp3rrolidone. Appl. Phys. Lett. 2001 79 3485-3487... [Pg.287]

Example of the Study on Structure and Dynamics of Poly(vinyl alcohol) (PVA) Gel by High-Resolution Solid-state NMR Technique It is thought that hydrogen bonding plays an important role in the formation of crosslinking between polymer chains in the poly(vinyl alcohol) gel prepared by the repeated fireeze/melting method. The NMR... [Pg.258]

See other pages where Poly gels preparation is mentioned: [Pg.133]    [Pg.134]    [Pg.135]    [Pg.40]    [Pg.2752]    [Pg.1523]    [Pg.208]    [Pg.741]    [Pg.104]    [Pg.4]    [Pg.9]    [Pg.407]    [Pg.328]    [Pg.279]    [Pg.98]    [Pg.411]    [Pg.34]    [Pg.284]    [Pg.2156]    [Pg.66]    [Pg.678]    [Pg.157]    [Pg.261]    [Pg.149]    [Pg.194]    [Pg.172]    [Pg.370]    [Pg.232]    [Pg.37]    [Pg.4]    [Pg.275]    [Pg.225]    [Pg.336]    [Pg.442]    [Pg.5]    [Pg.135]    [Pg.522]    [Pg.1260]    [Pg.1326]    [Pg.232]   


SEARCH



Poly , preparation

Poly prepared

© 2024 chempedia.info