Swollen weight

Q = (swollen weight - dried weight)/(original weight x 100/formula weight). 

The water content of a resin is usually expressed as a percent of its swollen weight, but some authorities prefer to express water content as the weight of water taken up by 1 gram of initially dry resin, in which case it is termed water regain. If the water content is W percent and the water regain WR (gH20 per dry gram), the relation between the two values is ... 

Table 5.1 Specific values of swollen volume (VJ, swollen weight (TVJ, dry volume (W ), and resin phase molality (va) for different ionic forms of a standard strongly acidic cation exchange resin (8% DVB) (from H. P. Gregor, F. Gutoff, and J. Bregman, J. Colloid Sci., 1951, 6, 245)...

The degree of swelling of a corsslinked polymer was determined in different solvents at 30°. Samples were cut into the desired shape and were immersed in large excesses of various solvents, viz hexane, ethyl acetate, chloroform, methyl ethyl ketone, tetrahydro-furan, acetone, dioxane and acetonitrile. The crosslinked polymer was taken out of the solvent after 24 hours. Solvent on the surface was wiped out with a filter paper and then the polymer sample was weighed in a stoppered bottle. Weight of the sample was recorded at 15, 30,4 5, 60, and 90 seconds, after the removal of the sample from the solvent. The swollen weight was determined by linear extrapolation to zero time. The sample was vacuum dried to constant weight. The volume fraction of the polymer in the gel swollen to equilibrium was calculated by ... 

The progression of an ideal emulsion polymerization is considered in three different intervals after forming primary radicals and low-molecular weight oligomers within the water phase. In the first stage (Interval I), the polymerization progresses within the micelle structure. The oligomeric radicals react with the individual monomer molecules within the micelles to form short polymer chains with an ion radical on one end. This leads to the formation of a new phase (i.e., polymer latex particles swollen with the monomer) in the polymerization medium. 

Successful NMP in emulsion requires use of conditions where there is no discrete monomer droplet phase and a mechanism to remove any excess nitroxide formed in the particle phase as a consequence of the persistent radical effect. Szkurhan and Georges"18 precipitated an acetone solution of a low molecular weight TEMPO-tcrminated PS into an aqueous solution of PVA to form emulsion particles. These were swollen with monomer and polymerized at 135 °C to yield very low dispersity PS and a stable latex. Nicolas et at.219 performed emulsion NMP of BA at 90 °C making use of the water-soluble alkoxyamine 110 or the corresponding sodium salt both of which are based on the open-chain nitroxide 89. They obtained PBA with narrow molecular weight distribution as a stable latex at a relatively high solids level (26%). A low dispersity PBA-WocA-PS was also prepared,... 

Polymer composites of mbber-hydrogel are permeable for water-soluble low-molecular weight compounds in a swollen state. Therefore, it is suitable for dmg delivery carrier. Many papers have researched the basic role of composite morphology in low-molecular weight component transport through two-phase composites where only one phase played the main role. 

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