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<正>New Schiff base polymers poly[4,4'-methylenebis(cinnamaldehyde)ethylenediimine] (PMBCen), poly[4,4'-methylenebis(cinnamaldehyde) 1,2-propylenediimine] (PMBCPn), poly[4,4'-methylenebis(cinnamaldehyde) 1,3-propylenediimine] (PMBCPR), po