Polycondensation interfadal

Interfacially formed condensation polymers such as polyesters, polycarbonates, nylons, and PUs are typically formed on a microscopic level in a chain-growth manner largely because of the highly reactive nature of the reactants employed for such interfadal polycondensations. 

Crespy D, Stark M, Hoffmann-Richter C, et al. (2007) Polymeric nanoreactors for hy-drophUic reagents synthesized by interfadal polycondensation on miniemulsion droplets. Macromolecules 40 3122-3135... 

Solution polycondensation employs the same reactions as used in interfadal polycondensation and similar reaction rates are involved. This means that the fastest reactions have rates on the order of 10 -10 1/mole-sec. Polycondensations involving such reactions may be completed in a few minutes at room temperature. 

Su, J.-F., Wang, L.-X, Ren, L., Huang, Z and Meng, X.-W. (2006) Preparation and characterization of polyurethane microcapsules containing -octadecane with styrene-maleic anhydride as a surfactant by interfadal polycondensation./. Appl. Polym. Sci., 102, 4996-5006. 

Interfadal polycondensation n Involves polymer formation at or near the interface between two immiscible monomer solutions under very mild reaction conditions. 

Many researchers have studied the interfacial science and technology of laminar flow in microfluidics [8]. Interfacial polymerization and the subsequent formation of solid micro structures, such as membranes and fibers in a laminar flow system, are very interesting techniques because the bottom-up method through polymerization is suitable for the formation of miniature structures in a microspace [3]. The development of such microstructure systems plays an important role for the integration of various microfluidic operations and microchemical processing [9]. For instance, membrane formation in a microchannel and further modification has a strong potential for useful functions such as microseparation, microreaction and biochemical analysis [8-10]. Here, we will introduce several reports on polyamide and protein membrane formation through interfadal polycondensation in a microflow. 

Microcapsules can be made to release their contents on exposure to light by incorporating into the core of the microcapsule a material that photochemically eliminates a gaseous product. Mathiowitz and Raziel have described such system, which involves polyamide microcapsules prepared by interfadal polycondensation of... 

Interfadal polymerization This method, developed by Cadotte and the coworkers of Film Tech in the 1970s, is currently most widely used to prepare high performance reverse osmosis and nanofiltration membranes [6]. A thin selective layer is deposited on top of a porous substrate membrane by interfacial in situ polycondensation. There are a number of modifications of this method primarily based on the choice of the monomers [7]. However, for simplicity, the polycondensation procedure is described by a pair of diamine and diacid chloride monomers. 

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