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of P(DVB–NH2–0.5-StSO3H) almost did not change after recycling
five times, indicating that the acid and base groups of P(DVB–
NH2–0.5-StSO3H) did not leach during the reaction. The SEM
images and TEM images (Fig. S6, ESI†) also showed that the
morphology of P(DVB–NH2–0.5-StSO3H) did not change after
recycling the catalysts five times. According to the N2 sorption
isotherm (Fig. S7, ESI†) for P(DVB–NH2–0.5-StSO3H) after reuse
five times, the mesoporosity of the catalysts did not change. The
´
´
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BET surface areas were 356.6 m2 ꢀ1, the pore volumes were
g
0.55 cm3 gꢀ1, and the pore size distributions were ca. 7.5 nm.
Therefore, P(DVB–NH2–0.5-StSO3H) was proved to be a highly
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4. Conclusions
A series of efficient acid–base bifunctional catalysts P(DVB–
NH2–n-StSO3H) were prepared by a concise method combining
solvothermal co-polymerization and post-functionalization.
Compared with bifunctional catalysts that were successively
modified with acid and base functional groups in the same
carrier, catalysts synthesized by this strategy exhibited a better
catalytic effect in the one-pot deacetalizationꢀKnoevenagel
condensation reaction. The unique porous structure and the
effective isolation of acid–base functional groups enable
bifunctional catalysts P(DVB–NH2–n-StSO3H) to exhibit excel-
lent catalytic performance and good reusability. This kind of
strategy may provide more possibilities for the preparation of
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Conflicts of interest
There are no conflicts to declare.
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