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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.

²»ÖªµÀÈçºÎÀí½âµÚ¶þ¾ä£¬×ÔÓÉÌå»ý·ÖÂÊfree volume fractionÊÇÖ¸Ê²Ã´ÄØ£¿ÆÆ»µ·Ö×Ó°ü²ãdisrupt the molecular packingÓÖÈçºÎÀí½â£¿ÎªÊ²Ã´¶Ë»ùÕ¼Óиü¸ßµÄ×ÔÓÉÌå»ý·ÖÂÊ¾Í»áÆÆ»µ·Ö×Ó°ü²ã£¿

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