间苯二酚/甲醛凝胶骨架合成及孔结构调控规律

Resorcinol-Formaldehyde gel (abbreviation RF) with application prospect is a new material synthesized by sol-gel method. On the basis of analysis the form of gel condensation polymer, this paper presents that altering the type and quantity of catalyst is one of the important methods to adjust pore size and distribution. According to the contrast of gel time and experimental data tested by SEM, TEM and BET, the rules of regulating pore structure were indicated. Namely, while the same amount of catalyst used Na2CO3 or Ca(OH)2 was added into solution, the pore volume of gel prepared by Na2CO3 would be larger than products synthesized by Ca(OH)2. Reaction time will shorten and the specific surface area of RF gel will increase with the mole ratio of resorcinol and catalyst(R/C) value reduced. However, specific surface area decreases severely while R/C value is smaller than 50. Thus the appropriate technological parameters are listed as followed: anhydrous Na2CO3 is used as catalyst, R/C value is equal to 50. Under condition of above mentioned routing, the specific surface area of gel pore is larger than 580m2/g.