Bismaleimides bearing electron-donating chromophore moieties

i．e．N

N-bis (4-maleimidophenyl)-methylamine (BMIPMA)

and its saturated model compound N

N-bis (4-succinimidophenyl)-methylamine (BSIPMA) were synthesized and their absorption and fluorescence behaviors were investigated．It was found that BMIPMA possess a strong fluorescence structural self-quenching effect (SSQE)．There is almost no fluorescence emission observed for BMIPMA

whereas its saturated model compound BSIPMA displays a strong fluorescence emission at the same chromophore concentration．On the basis of the SSQE

a new fluorescence approach was developed to monitor the process of the copolymerization of bismaleimides with diamines

which can directly reflect the consumption of the C=C bond of maleimide unit．The results agreed well with that obtained by 1H-NMR measurement pused．