Effects of gelation

Journal of Applied Polymer Science 90, No.7, 14th Nov.2003, pl808-24 EFFECT OF GELATION ON THE FLOW PROCESSABILITY OF POLY(VINYL CHLORIDE)... 

Table 2 Effect of gelation pH on the texture of monolithic silica hydrogels.

The effect of gelation pH on silica texture is complex. A low pH value favors the formation of small elementary particles of silica, which would lead to the formation of small pores in the resulting gel. But, when the pH of the sol-gel transition has the neutral pH value the silica gelation is very fast, the silica particles exhibit a broad size distribution and the resulting gel network has a wide open porosity (large pore volume and mean diameter). 

Table 5 Effect of gelation temperature on hydrogel texture.

Table 8 Effect of gelation temperature on the texture of hydrogels and xerogels of silica and...

Tan MM, Corley CA, and Stevenson CL. Effect of Gelation on the Chemical Stability and Conformation of Leuprolide. Pharm Res 1998 15 1442-1447. 

Various viscosity models have implicitly included the effects of gelation on the chemoviscosity, and these were reviewed in Table 4.2 incorporating gelation-conversion and glass-transition-temperature effects implicitly in the cure effects on chemoviscosity. Explicit models for the expression of gel time versus temperature and time are sparse, with empirical measurements mainly being used. 

Thus, with a knowledge of the effects of gelation and an accurate chemoviscosity model, the optimum flow and cure conditions can be established. The measurement techniques for chemoviscosity and gelation effects will be reviewed next. 

Effects of gelation of alginate around chymotiypsin on reactivities... 

Key words Reactivities of chymotrypsin - gelation of alginate - immobilized enzyme - effects of gelation capsule... 

Figure 3, Effect of gelator (ALSP) concentrations on zero shear...

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