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Molecular weight differences in 6FDA-PFMB films may affect molecular packing due to changes in the chain end group density.

It is evident that chain end groups may possess a higher free volume fraction and therefore disrupt the molecular packing.

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Molecular weight differences in 6FDA-PFMB films may affect molecular packing due to changes in the chain end group density.It is evident that chain end groups may possess a higher free volume fraction and therefore disrupt the molecular packing.
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