AbstractA very convenient and reliable gravimetric method was developed for measuring swelling of poly(styrene‐co‐divinylbenzene) in particulate form. The method is based on the gravimetric procedure reported earlier2for monitoring liquid uptake by thin (<0.3 mm) microporous composite films, consisting of swellable particulate (80 by weight) enmeshed in poly(tetrafluoroethylene) microfibers (20). The swellabilityS(in milliliter of liquid absorbed per gram of polymer in equilibrium with excess liquid) for six sty‐co‐DVB polymers with crosslink densities ranging from 0.01 to 0.12 was measured in 19 organic liquids. In each study of S as a function of the relationship was given by where is the average number of carbon atoms in the “backbone” of the polystyrene segments between cross‐link junction,Cis the relative swelling power of the liquid, and is the critical cross‐link density above whichSi
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