Preparation And CO₂ Adsorption Study Of Microporous Polymer

Porous materials with high surface area and big absorption capacity can be used in various fields such as adsorption, separation, catalysis and electrochemistry. Compare with the inorganic porous material, the organic porous material is difficult at pore distribution and the structure control. But it is not easy to absorb water, surface tension between the microspores and the air is low, thus has the better structural stability. It's easy to increases the function of the material by the introduction of special functional group to the surface of the pores. So it can expand the application field greatly.In the article microporous polymer is prepared with the reaction between melamine and terephthalaldeyde or isophthalaldehyde or biphenyldicarboxaldehyde. Formaldehyde was used to modify the pore structure of the polymer. The branched structures of macromolecular chains make the micropore and the structure the polymer monomeric unit supports forms the macroporous and mesoporous structure. The use of formaldehyde can increase the microporous structure by enhancing the degree of branched structure of macromolecular chains. Macroporous and mesoporous structure decrease by making the macromolecular chains more distorted with the use of formaldehyde. Meanwhile, the pore size can be controlled from 100nm to 10nm. The CO2 adsorption mounts of polymer increase with the pore volume. The reaction belongs to Schiff base chemistry and no catalysis is needed. The material exhibited high thermal stability and is insoluble at acidic or alkaline conditions. With the porous structure the polymer can be used at gas adsorption and the nitrogen-rich polymer may also have application in novel proton conducting materials.