Nitrogen polymers

Zero C Lutex Chemical Corp. nitrogeneous polymer... 

Sulfur-Nitrogen Polymers Containing Three-Coordinate Sulfur(lV)... 

Figure 2. Scheme for formation of nitrogenous polymers In soils by condensation of amino acids with polyphenols and sugars. 

There is great interest in developing molecular precursors for boron-nitrogen polymers and boron nitride solid state materials, and one general procedure is described in this report. Combinations of B-trichloroborazene and hexamethyldisilazane lead to formation of a gel which, upon thermolysis, gives hexagonal boron nitride. The BN has been characterized by infrared spectroscopy, x-ray powder diffraction and transmission electron microscopy. 

Laubengayer, A. W., K. Wade, and G. Lengnick Aluminium-Nitrogen Polymers. The Formation and Condensation of Adducts of Triphenyl-alane with Methylamine and Dimethylamine. Inorg. Chem. 1, 632 (1962). 

Synthesis of Phosphorus-Nitrogen Polymers by Using Silicon-Nitrogen-Phosphorus Reagents... 

Several examples of well-characterised boron-nitrogen polymers are known. Polyborazylene 9.16 (with molecular weights up to ca 7600 and up to ca... 

Current interest in saturated Si-N rings stems primarily from the industrial uses of silicon nitride (and related materials), which is a hard, chemically resistant insulator, and as precursors to silicon-nitrogen polymers (poly-silazanes). The formation and precursor chemistry of these polymers are discussed in Section 10.3.3. 

Detailed investigations are being conducted in the field of boron-nitrogen polymers with N— B coordinative bonds due to their hydrolytic stability (superior to that of the polymers containing tricoordinate boron). Such plastics and elastomers are likely to become candidates for special applications because of the high cross-section of 10B for the (n, a) reaction.171... 

For example, there is considerable interest in the preparation of sulfur-nitrogen polymers that have organic substituents on the sulfur atoms.56 This could help alleviate the intractability problem mentioned, and could also give rise to a series of polymers that parallel the phosphazenes in their structural variability. A series of polymers with S-N backbones of this type has been prepared, but with oxygen atoms as some of the substituents. The basic structure has the repeat unit -RS(=0)(N)- or -FS(=0)(N)-but they have not yet been studied in detail. The fluorine-containing polymer, however, is known to be a tough elastomer which is unaffected by water, acids, or bases up to 100 °C.7... 

A small smorgasbord of published papers will be discussed here, to show how some of the things that we have seen in previous chapters have appeared in the literature. The four topics of this section (oxirene, nitrogen pentafluoride, pyramidane and nitrogen polymers), and several others, are addressed in more detail in another book [1],... 

The reaction was carried out with the usual condensation technique, both gases being condensed together at the temperature of liquid nitrogen. Polymers are obtained as by-products. 

Myers et al. reported that partially dehydrated APB is an effective intumescent flame retardant in thermoplastic polyurethane.77 APB at 5-10 phr loading in TPU can provide 7- to 10-fold improvement in burn-through test. It is believed that in the temperature range of 230°C-450°C, the dehydrated APB and its released boric oxide/boric acid may react with the diol and/or isocyanate, the decomposed fragments from TPU, to produce a highly cross-linked borate ester and possibly boron-nitrogen polymer that can reduce the rate of formation of flammable volatiles and result in intumescent char. 

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