Organometallic polymers overview

Organometallic polymer precursors offer the potential to manufacture shaped forms of advanced ceramic materials using low temperature processing. Polysilazanes, compounds containing Si-N bonds in the polymer backbone, can be used as precursors to silicon nitride containing ceramic materials. This chapter provides an overview of the general synthetic approaches to polysilazanes with particular emphasis on the synthesis of preceramic polysilazanes. 

West, R., and J. Maxka, Polysilane High Polymers An Overview, Chap. 2 in Inorganic and Organometallic Polymers, M. Zeldin, K. J. Wynne, and H. R. Allcock, eds., Am. Chem. Soc. Symp. Ser., Vol. 360, American Chemical Society, Washington, DC, 1988. 

The objectives of this article are (i) to give an overview on the compounds prepared mainly during the last five years, (ii) to compare synthetic routes, (iii) to discuss the structures and some structure-property relationships and (iv) to highlight important future directions for organometallic polymers containing germanium, tin and lead, respectively. 

In the fields of organometallic polymer see Polymer) chemistry , in which complexes may have particularly interesting physical properties (liquid crystallinity, optical nonlinearity see Nonlinear Optical Materials), etc.), or of molecular electronics , metal alkynyl complexes play a significant role. These areas have been the subject of recent reviews, thus only a brief overview of methods to prepare iron alkynes will be given here. Liu has also recently reviewed the cyclization chemistry of alkynyl organometaUics, including those of iron. ... 

The following chapters represent an effort to provide an overview of several new and continuing areas of development in inorganic and organometallic polymer science. 

The goal of this chapter is to present an overview of reports in the scientific literature that involve the use of microwave heating in the preparation of inorganic and organometallic compounds. For practical purposes, no attanpt has been made to cover compounds of all elements. The scope has been limited to coordination compounds and organometallic complexes containing transition metals. The focus is on molecular compounds and not on materials that could be classified as nanoparticles, polymers, supported catalysts, metal-organic frameworks, or solid-state materials. 

Block Copolymers. Several methods such as ultrasonics (100), radiation (101), and chemical techniques (102,103), including the use of polymer ions, polymer radicals, and organometallic initiators, are available to prepare Block Copolymers of acrylonitrile. Acrylonitrile can be used as either the first-or the second-phase monomer. Depending on the mechanism of termination, a diblock of the AB type and a triblock of the ABA type can be formed by disproportionation or transfer for the former, and recombination for the latter. Some of the comonomers are styrene, methyl acrylate, vinyl chloride, methyl methacrylate, vinyl acetate, acrylic acid, and re-butyl isocyanate. An overview and survey of alternating and block copolymers can be found in Reference 104. 

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