Porous Copolymer Resins: Tuning Pore Structure and Surface Area with Non Reactive Porogens

Abstract

In this review, the preparation of porous copolymer resin (PCR) materials via suspension polymerization with variable properties are described by tuning the polymerization reaction, using solvents which act as porogens, to yield microporous, mesoporous, and macroporous materials. The porogenic properties of solvents are related to traditional solubility parameters which yield significant changes in the surface area, porosity, pore volume, and morphology of the polymeric materials. The mutual solubility characteristics of the solvents, monomer units, and the polymeric resins contribute to the formation of porous materials with tunable pore structures and surface areas. The importance of the initiator solubility, surface effects, the temporal variation of solvent composition during polymerization, and temperature effects contribute to the variable physicochemical properties of the PCR materials. An improved understanding of the factors governing the mechanism of formation for PCR materials will contribute to the development and design of versatile materials with tunable properties for a wide range of technical applications.

Voltammetric sensor for theophylline using sol–gel immobilized molecularly imprinted polymer particles

“…When polymerisation is induced, the resultant chain becomes progressively more unstable until the point of phase separation which causes the collapse and subsequent precipitation of the polymer chain into the solvent and thus the formation of a polymer particle. In the case of MIPs, the additional polar surface area of the template molecule provides substantial additional thermodynamic stability during chain growth which can significantly delay polymer precipitation into the solvent phase, resulting in a large size difference between the MIP and its control [31,32]; in this case, this size difference is 7-fold. The increase in particle size distribution observed in the MIP relative to its control can be minimised with decreased mechanical agitation, which is the main source of turbulence within the solvent phase during the polymerisation process.…”

Preparation and performance of 99Mo/99mTc chromatographic column generator based on zirconium molybdosilicate

“…Table 3 compiles some physical characteristics of ZrMoSi gel prepared at the optimum conditions. According to Table 3, ZrMoSi gel material is a microporous material with an average pore size of 1.39 nm [27], an average particle size of 0.73 mm and a specific surface area of 14.28 m 2 /g. Figure 1 shows the IR spectrum of the prepared ZrMoSi gel.…”

Manipulation of pH induced sensitivity of a fluorescent probe in presence of silver nanoparticles

“…To our opinion, the high voltage extending to 25 000 V distinctly effected dielectric properties of the polar ethyl cellulose in presence of the silver nano particles with respect to the Ag-free structures and therefore inhibited formation of the continuous fibers. Some morphological changes, especially on the porosity of electrospun fibers of ethyl cellulose was conducted to the intiristinc polarity of the polymer or polarity of the exploited solvent, earlier[28,29]. This observation is only valid for the ethyl cellulose based matrix.…”