Non-active A_m + B_n Type Reaction Of Synthesis Of New Polymers And Their Functionalized

Recent attention has focused on nonlinear architectures such as star-shaped polymers including miktorarm and block coplymers, graft copolymers, dentrimers, hyperbranch polymers, due to their unique properties. For example, dendrimer-like copolymers have potential applications in many fields, such as catalysis, drug delivery and biomimetics. Hyperbranched polymers have been successfully immobilized onto the surface of Au and silicon wafer for a number of technical applications, including corrosion inhibition and chemical sensors. As compared to their linear analogous, hyperbranched polymers have drawn much attention due to their similar topology structures and properties comparing with dendrimers. They can be used as alternatives of dendrimers in some cases. However, hyperbranched polymers are easier to prepare, they become more attractive in the applications. The self-condensation polymerizations of AB_n type monomers are well-known to prepare hyperbranched polymers which needing specific AB_n monomers normally prepared by several steps. Recently the polymerizations of multifunctional monomers have been developed to one of the most efficiency approaches in preparing hyperbranched polymers. This approach can be realized practically due to the availability of monomers, and hyperbranched polymers with novel structures could be obtained easily.Polymerizations of multifunctional monomers can be divided into ideal and nonideal polymerizations based on whether the reactivity of all the functional groups is the same or not. According to Flory's theory, gelation would occur in the polymerizations of multifunctional monomers when the monomer conversions surpassed the critical gel points. However, when the reactivity of the functional groups in multifunctional monomers was unequal, the situation became complicated and even polymers with novel structures and properties could be obtained. For the ideal polymerizations of multifunctional monomers stringent polymerization conditions needed to be obeyed to avoid gelation, for example, low monomer concentrations, strictly controlled slow addition rates and monomer conversions; meanwhile, nonideal...