Methyl methacrylate polymerization in nanoporous confinement

Equilibrium free-radical polymerization of methyl methacrylate under nanoconfinement

“…In this work, the pores with surface silanol groups (eSiOH) are termed hydrophilic pores, whereas the pores with silanol replaced by trimethylsilyl groups (eSi(CH 3 ) 3 ) are termed hydrophobic pores. The purification of reactants and the surface treatment of nanopores follow the same procedures outlined in previous work [13,14].…”

“…In previous work, we investigated the reaction kinetics and properties of free radical polymerization of methyl methacrylate (MMA) in the nanopores of controlled pore glass (CPG) [13,14] and found that the onset of autoacceleration shifted to shorter times presumably due to the reduced diffusivity of the nanoconfined chains. In addition, in hydrophilic pores, the initial propagation rate was higher than that in either hydrophobic pores or the bulk system due to the catalysis by silanol groups on the CPG surface [13]. The enhanced reactivity was accompanied by increased molecular weight and increased isotacticity [14].…”

Chemical Processes

“…An example of the Trommsdorff-Norrish effect is seen in Fig. 4.1 that displays some kinetic data [10] on the polymerization of methyl methacrylate in bulk and nanopores. The initial stages of polymerization demonstrate the decelerating, i.e., reaction-order type of kinetics (see Fig.…”

“…A change in thermal stability or, more generally, a change in the reaction rate may be associated with a change in the preexponential factor. In fact, a change in the preexponential factor appears to be the primary cause of deceleration [82] as well as acceleration [10,83,84] of chemical reactions when they are confined to nanopores. Also, thermal stability may change because of a change in the reaction mechanism and, thus, a change in the reaction model.…”

Synthesis, characterization and application of a novel carbon bridged half-metallocene chromium catalyst for methyl methacrylate polymerization

“…Much attention has been diverted in the past two decades to the polymerization of MMA initiated by various mechanisms and compounds, such as RATRP& ATRP [1][2][3][4][5] , group-transfer polymerization (GTP) [6] , free radical polymerization (FRP) [7][8][9] and anionic polymerization [10] . There is a high current interest in the development of coordination catalysis for MMA polymerization.…”