Molecular weight and size

Puskas, J.E. et al. Comparison of molecular weight and size measurement of polyisobutylenes by SEC-MALLS and viscometry, J. Polym. Sci. Chem., 44, 1777, 2006. 

Wyatt, P. J., Hicks, D. L., Jackson, C., and Wyatt, G. K., Absolute gel permeation chromatographic determination of molecular weight and sizes. Part 2. Incorporation of gel permeation chromatography-size exclusion chromatographic measurements, Am. Lab., 20, 108, 1988. 

The lipid solubility, degree of ionization, pKa of the drug, pH of the drug solution, presence of saliva and the membrane characteristics, molecular weight and size of the drug, various physicochemical properties of the formulation, and the presence or absence of permeation enhancers, all affect the absorption and the permeation of drugs through the oral mucosa. 

What is the physicochemical and pharmacological nature of the penetrant The drugs to be delivered should be considered in relation to its polarity and partition characteristics, molecular weight and size, in respect of either water-based or more hydrophobic systems. 

The objectives of the extender-filler in glue mixes are to improve the adhesive performance, to help control the mix viscosity and to conserve the phenolic and urea adhesives. These fillers and extenders serve specific needs in these glue mixes. They extend the resin solution from its original non-volatile state to lower levels, such as 26 percent resin solids in the mix. They also function as a means of maintaining the very low resin molecular weight and size molecules on the surface when they are applied to the veneer to prevent over-penetration prior to hot press pressure and temperature which gels the resin to a permanently set condition. 

For instance, in liquid-phase adsorption, it has been established that the adsorption capacity of an activated carbon depends on the adsorbent s pore structure, ash content, functional groups [184-186], the nature of the adsorbate, its p//a, functional groups present, polarity, molecular weight, and size [187], and, finally, the solution conditions, such as pH, ionic strength, and the adsorbate concentration [188],... 

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