Three kinds of phenolic resins have been synthesized at pH of 3 (with phenol/formaldehyde molar ratio of 1∶0 75 catalyzed by oxalic acid), 8(with phenol/formaldehyde molar ratio of 1∶1 4～1∶2 4 catalyzed by KOH) and 14(with phenol/formaldehyde molar ratio of 1∶1 2～1∶1 5 catalyzed by KOH), respectively. Investigation on the crosslinking reaction between phenolic resins and borate showed that resin synthesized at basic condition can chelated with borate quickly by passing CO 2 through the resin sand. The results indicated that the cured casting of the resin synthesized at pH=14 possessed the highest mechanical strength.
Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one-step procedure.It was further modified by stearyl chloride to form an amphiphilic hyperbranched polymer.The structures of these polymers were characterized by FT-IR,{}+1H-NMR,DSC and GPC analyses.Due to the existence of interior secondary amines,the modified polymer can be used as phase transferring agent to extract methylic orange from water layer to CHCl-3 layer.Both higher transferring capability and higher transferring rate were achieved at lower pH of the water phase.The extracted dye in the organic layer can be further released to the water layer under a basic condition.A possible mechanism for extracting dye by amphiphilic hyperbranched polymer was suggested.
