PAL spectroscopy and a technique for low-temperature gas sorption together with Brunauer-Emett-Teller (BET) theory (1) were used for the studies of elementary free volumes (EFV) in super-cross-linked polystyrene networks (2,3). The ranges of effective sizes observed by PAL and BET overlap partly confirming and complementing each other very effectively. I. Samples Polystyrene (PS) networks were prepared by the cross-linking of linear PS swollen in a solvent. Cross-agents of different length p-xylylene dichloride (X) and monochloro-dimethylether (E) were used After removing a solvent, the samples had extremely high specific surface up to 1600 m 2 /g
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Shantarovich et al. (2004) studied this question.
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