Two fiber supported tertiary amine catalysts were prepared by immobilization of 3-dimethylamino-1-propylamine (PAN_DF) and 3-dimethylamino-N-methylpropylamine (PAN_TF) on polyacrylonitrile fiber. Both fiber catalysts contain polar microenvironments constructed by amide groups, tertiary amine groups and unreacted cyano groups. The difference between the two catalysts lies in that the PAN_DF contains hydrogen bond network while the PAN_TF does not. Employing Knoevenagel condensation as a model reaction, the cooperative action of immobilized tertiary amines with hydrogen bonds was evaluated in detail. At the same time, the aggregation of reactants in the polar microenvironment under different solvents was also investigated. The results showed that hydrogen bonds and the supporting basic groups can promote the reaction by the synergistic catalytic effect in most solvents. The catalysts displayed different catalytic behaviors in solvents with different polarities. The catalysts can achieve highly efficient catalytic activity in the more polar solvents which were well compatible with the catalysts. Moreover, the reaction can also occur in less polar solvents due to their incompatible property with the fiber catalysts, which can compel the polar reactants to accumulate on the fiber surface with strong polar microenvironment.

通过将3-二甲基氨基-1-丙胺（PAN _D F）和3-二甲基氨基-N-甲基丙胺（PAN _T F）固定在聚丙烯腈纤维上，制备了两种纤维负载的叔胺催化剂。两种纤维催化剂均包含由酰胺基，叔胺基和未反应的氰基构成的极性微环境。两种催化剂的区别在于PAN _D F包含氢键网络，而PAN _TF没有。以Knoevenagel缩合为模型反应，详细评估了固定化叔胺与氢键的协同作用。同时，还研究了在不同溶剂下极性微环境中反应物的聚集。结果表明，在大多数溶剂中，氢键和支持的碱性基团可以通过协同催化作用促进反应。催化剂在具有不同极性的溶剂中表现出不同的催化行为。该催化剂可以在与该催化剂良好相容的极性更大的溶剂中实现高效的催化活性。此外，由于极性溶剂与纤维催化剂的不相容性，该反应也可能在极性较小的溶剂中发生，