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PALS results show a bimodal pore size distribution for a spirobisindane polymer, with the majority of pores being of the larger size. Gas permeability, density and PALS results suggest the polymer undergoes physical aging during permeability testing. PALS results also show that solution processing generates extra free volume above the intrinsic free volume of the precipitated polymer.
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Staiger et al. (2008) studied this question.
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