Phosphorus-containing boron polymers

Ceramic-type materials that contain no organic linkage units can be prepared by the pyrolysis of cyclic or high polymeric aminophosphazenes. An example is shown in reaction (44). Under appropriate conditions, pyrolysis products that correspond to phosphorus-nitride are formed. Polyphosphazenes that contain both amino and borazine side groups yield phosphorus-nitrogen-boron ceramics following pyrolysis 94,95 The conversion of a formable polymer into a ceramic has many potential advantages for the controlled synthesis and fabrication of advanced ceramics. This principle is discussed in more detail in Chapter 9. 

Ferrocene-Based Polymers, and Additional Phosphorus- and Boron-Containing Polymers... 

Extension of the correlations to polymers containing other elements, such as inorganic and organometallic polymers [16] containing boron [17,18] or phosphorus [19]. Such an extension appears feasible since the properties of such solids as amorphous selenium, and complicated chalcogenide-based alloys used in electrical and optical applications, can often be calculated by techniques resembling the methods used to study ordinary polymers [20,21]. 

Polyphosphinoboranes containing phosphorus and boron linked to each other in polymeric chains have remained elusive for a long time. Recently, catalytic dehydrogenation of the phosphine-borane adducts has been found to be effective to prepare the linear polymer. Thus, thermal treatment of PhPH2.BH3 in the presence of catalytic amounts of [(l,5-COD)Rh( j,-Cl)] affords the linear polymer poly(phenylphosphinoborane), [PhHPBH2]n (see Eq. 1.13) [28-30]. High polymers with of about 33,000 have been isolated by this procedure. 

Kilinc Mert, Cakal Gaye O., Bayram Goknur, Eroglu Inci, and Ozkar Saim. Flame retardancy and mechanical properties of pet-based composites containing phosphorus and boron-based additives. J. Appl. Polym. Sci. 132 no. 22 (2015) 42016-42021. 

Specifically, the greatest emphasis in the following chapters is placed on polyphosphazenes (1.9), polysiloxanes (1.10), and polysilanes (1.11). Chapters 6 and 7 introduce a wide variety of other polymers that contain elements such as phosphorus, germanium, sulfur, boron, aluminum, and tin, and a variety of transition metals. These polymers are expected to provide the basis for many of the new advances of the future. Chapter 8... 

In the following sections some examples are given of the ways in which these principles have been utilized. The first example is the use of these techniques for the low temperature preparation of oxide ceramics such as silica. This process can also be used to produce alumina, titanium oxide, or other metal oxides. The second example describes the conversion of organic polymers to carbon fiber, a process that was probably the inspiration for the later development of routes to a range of non-oxide ceramics. Following this are brief reviews of processes that lead to the formation of silicon carbide, silicon nitride, boron nitride, and aluminum nitride, plus an introduction to the synthesis of other ceramics such as phosphorus nitride, nitrogen-phosphorus-boron materials, and an example of a transition metal-containing ceramic material. 

Inorganic polymers have backbone chains that do not contain carbon, as organic polymers do, but atoms such as oxygen, nitrogen, phosphorus, boron, silicon, and metals or alternating combinations of them. The side groups attached... 

Other Inorganic Polymers that Contain Phosphorus, Boron and Sulfur... 

---