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Synthesis of hyperbranched organometallic polymers and their use as precursors to advanced ceramic materials

Authors Tang, Ben Zhong View this author's profile
Xu, Kaitian HKUST affiliated (currently or previously).
Peng, Han HKUST affiliated (currently or previously).
Luo, Jingdong HKUST affiliated (currently or previously)
Zhang, Xixiang HKUST affiliated (currently or previously)
Sun, Qunhui HKUST affiliated (currently or previously)
Lam, Jacky Wing Yip View this author's profile
Cha, John Ada K. HKUST affiliated (currently or previously)
Issue Date 2004-07-06
Source US Patent , 6,759,502 B1, 2004
Summary At present time techniques in preparing advanced ceramic materials with high electrical conductivity and magnetic susceptibility are rare. This new invention relates to hyperbranched organometallic polymers, which are useful as precursors to certain ceramic materials, processes for the preparation of such polymers and the preparation of ceramic materials from such polymers, ceramic materials and their use as ferromagnetic materials and electrically conductive materials. This Hyperbranched organometallic polymers are synthesized through the polymerization of dilithioferrocene and trichloroalkylsilanes. Pyrolysis of the hyperbranched polymers yields mesoporous, conductive, and magnetic ceramics. The three-dimensional structure of the hyperbranched polymers serves as shielding nets to keep the atom inside thereby enabling the high-yield production of the ceramic materials. Most of the hyperbranched polymer presursors of the invention are soluable in common solvents, melt at relatively low temperatures and can be processed into robust engineering forms such as thin films, which is different from the crosslinking polymer presursors as they are inherent intractable. The high iron content and the nanodimension of the iron clusters endow the ceramics with high electrical conductivity and superparamagnetic susceptibility. The saturation magnetizability of the ceramics is much higher than that from the linear polymers and the hysteresis loss is virtually zero, which means the ceramics are excellent soft ferromagnetic materials.
Language English
Format Patent
Access View details of TTC.PA.145 via HKUST Technology Transfer Center
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