Synthesis of Hyperbranched Organometallic Polymers and Their Use as Precursors to Advanced Ceramic Materials
- 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.
- Technology Benefits
- 1. Simple preparation by a one-pot procedure
2. High-yield production
3. Excellent processibility
4. High conductivity and magnetizability
5. Low hysteresis loss
6. All the starting materials are commercially available and inexpensive
7. The whole process involves no use of complex equipments and operations
- Technology Application
- - Smart magnetic cards
- Information recording and storage media
- Magnetic refrigeration
- Color imaging
- Ferrofluids
- Cell sorting
- Medical diagnosis
- Controlled site and target-specific drug delivery
- Nanodimensional motors and switches
- Reusable
- Supplementary Information
- Patent Number: US6759502B1
Application Number: US2002106752A
Inventor: Tang, Ben Zhong | Xu, Kaitian | Peng, Han | Luo, Jingdong | Zhang, Xixiang | Sun, Qunhui | Lam, Wing Yip | Cha, John A. K.
Priority Date: 26 Mar 2001
Priority Number: US6759502B1
Application Date: 26 Mar 2002
Publication Date: 6 Jul 2004
IPC Current: C08G007760
US Class: 528009 | 501154 | 556011
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Synthesis of hyperbranched organometallic polymers and their use as precursors to advanced ceramic materials
Usefulness: Synthesis of hyperbranched organometallic polymers and their use as precursors to advanced ceramic materials
Summary: For use as precursor for manufacture of ceramic materials used as ferromagnetic material and electrical conductive material. The ceramic material is used in the manufacture of magnetic cards, magnetic thin coatings, information recording and storage media, magnetic refrigeration, color imaging, ferro fluids, cell sorting, medical diagnosis, control site-and-target specific drug delivery, nano dimensional motors and switches, reusable supported catalyst and mesoporous filter.
Novelty: Preparation of hyperbranched organometallic polymer for manufacture of ceramic material, involves reacting dilithio ferrocene or its complex with specific silicon compound
- Industry
- Chemical/Material
- Sub Category
- Chemical/Material Application
- Application Date
- 26 Mar 2002
- Application No.
- US 10/106752
- Patent Information
- US 6759502
- ID No.
- TTC.PA.145
- Country/Region
- Hong Kong
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