Phosphorus-boron-nitrogen-containing

Phosphorus-boron-nitrogen-containing oligomer and polymer products comprising -P=0, -P-0-B-, -B-O-C- and -C-N-H- bonds are not studied enough. IR spectroscopy showed that these groups are a part of the PEDA luacromolecule composition. 

Phosphorus-boron-nitrogen-containing oligomer (PEDA)... 

A number of heterocycles containing both boron and phosphorus, of general types (30) and (31), have been reported. Reactions of some of these with primary amines give rise to phosphorus- and nitrogen-containing heterocycles. The triazaboradisilacyclohexane derivative (32) has also been prepared. 

The most commonly used and widely marketed GC detector based on chemiluminescence is the FPD [82], This detector differs from other gas-phase chemiluminescence techniques described below in that it detects chemiluminescence occurring in a flame, rather than cold chemiluminescence. The high temperatures of the flame promote chemical reactions that form key reaction intermediates and may provide additional thermal excitation of the emitting species. Flame emissions may be used to selectively detect compounds containing sulfur, nitrogen, phosphorus, boron, antimony, and arsenic, and even halogens under special reaction conditions [83, 84], but commercial detectors normally are configured only for sulfur and phosphorus detection [85-87], In the FPD, the GC column extends... 

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. 

The structure of this adduct has been determined by X-ray diffraction 144> and confirms the 2112 topology of the B4Hg framework. Furthermore, in agreement with the original conclusion 143>, the adduct contains a boron-phosphorus bond rather than a boron-nitrogen bond. 

This rule holds for all compounds containing carbon, hydrogen, oxygen, nitrogen, sulfur, and the halogens, as well as many of the less usual atoms such as phosphorus, boron, silicon, arsenic, and the alkaline earths. 

Boron compounds can be added in combination with other chemicals such as nitrogen and phosphorus. A solution containing sodium tripolyphosphate, boric acid, and ammonia provides a ready-to-use treatment on cellulose products such as plywood, fiberboard, and cardboard (87). The resulting products passed the British Standard 476, Section 6 (Fire Propagation test) Class 0 and Class I requirements of the British Standard Section 7 (Surface Spread of Flame). 

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... 

It is found that multiple bonds are often formed by elements in the first row of the periodic table (boron, carbon, nitrogen, oxygen), and less often by the heavier elements. For example, the nitrogen molecule, N.>, has the structure N=N , whereas the phosphorus molecule, P4, contains six bent single bonds. 

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