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Investigation of syntheses and new performances of highly-designed ,π-conjugated polymers.
Purely organic-derived radical polymers are a new class of molecules that are relevant to the future frontier of electronic and magnetic functions. Organic radical polymers bear multi-unpaired electrons, and are usually chemically reactive. However, they could be converted into stable materials by designing their molecular structures.
Very high-spin and durable organic polymers are realized for the π-conjugated polymers bearing pendant radical groups which are bonded with the backbone to satisfy a ferromagnetic connectivity. A typical example is the poly(2-radical substituted -1,4-phenylenevinylene) . A restricted head-to-tail linkage in the polymer leads to the high-spin polymer. Because the exchange interaction between electron spins through the π-conjugated system is very strong, this macromolecular approach has a potential for obtaining interesting magnetic properties even at room temperature. Magnetic force microscopy of the nanometer-sized, high-spin and hyperbranched polymer revealed a magnetic response exactly on the molecular position with its molecular size and spin density . The single-molecular based magnetic image is now being examined as a nano-scaled molecular magnet.
These radical polymers display a reversible and very rapid redox activity, which enables both a high energy-density and power-rate property for application as an electrode-active material in batteries. The radical polymers are also applicable as a hole-transporting layer in organic EL devices.
Red-colored membranes having a selective, reversible, and hemoglobin-like oxygen-binding capacity are prepared by complexing cobaltporphyrins with polymers . Oxygen transport is facilitated in the solid-state membranes . A downstream oxygen concentration of >90% was obtained after only a single pass of air through the membrane.
Green chemical polymerization to form poly(phenylene oxide)s and new proton-conducting polymers are also being studied.
Investigation of syntheses and new performances of highly-designed ,π-conjugated polymers.
Purely organic-derived radical polymers are a new class of molecules that are relevant to the future frontier of electronic and magnetic functions. Organic radical polymers bear multi-unpaired electrons, and are usually chemically reactive. However, they could be converted into stable materials by designing their molecular structures.
Very high-spin and durable organic polymers are realized for the π-conjugated polymers bearing pendant radical groups which are bonded with the backbone to satisfy a ferromagnetic connectivity. A typical example is the poly(2-radical substituted -1,4-phenylenevinylene) . A restricted head-to-tail linkage in the polymer leads to the high-spin polymer. Because the exchange interaction between electron spins through the π-conjugated system is very strong, this macromolecular approach has a potential for obtaining interesting magnetic properties even at room temperature. Magnetic force microscopy of the nanometer-sized, high-spin and hyperbranched polymer revealed a magnetic response exactly on the molecular position with its molecular size and spin density . The single-molecular based magnetic image is now being examined as a nano-scaled molecular magnet.
These radical polymers display a reversible and very rapid redox activity, which enables both a high energy-density and power-rate property for application as an electrode-active material in batteries. The radical polymers are also applicable as a hole-transporting layer in organic EL devices.
Red-colored membranes having a selective, reversible, and hemoglobin-like oxygen-binding capacity are prepared by complexing cobaltporphyrins with polymers . Oxygen transport is facilitated in the solid-state membranes . A downstream oxygen concentration of >90% was obtained after only a single pass of air through the membrane.
Green chemical polymerization to form poly(phenylene oxide)s and new proton-conducting polymers are also being studied.
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