Polyvinyl cyanide

It is also known as polyvinyl cyanide. Its structure is as follows ... 

A series of impure varieties termed a- and P-carbynes, chaoite, carbon VI, and carbons VIII—XIII have been reported. Some of these solids have a natural origin (e.g., chaoite was discovered in the crater of the meteorite Ries, Bavaria, Germany), whereas others have been synthesized through reactions such as the oxidative dehydropoly condensation of acetylene [28]. This type of structure has been detected in macroscopic amounts in the presence of heteroatoms, e.g., in polyvinyl cyanides, H—(C=C) —CN (where = 2 — 4). Attempts to prepare... 

In the other two studies, selenosulphate was used. In one, a formamide complex of Hg, made by dissolving HgO in formamide, was used [154]. The solution was made ca. 0.5 M in NaOH, and a trace of polyvinyl pyroUidone was added. The deposition was carried out at room temperature. The polyvinyl pyrollidone slowed the deposition somewhat and apparently improved fihn uniformity and adherence as well as slightly increased terminal thickness (500 mn). It was noted that films were not obtained with the usual complexants, such as ammonia, triethanolamine, and cyanide. It is not mentioned in which way these complexants were unsuitable ammonia and triethanolamine might be too weak, resulting in immediate precipitation in solution. Also, addition of ammonia to some mercuric salts tends to lead to precipitation of insoluble products. Cyanide, however, is a very strong com-plexant and would be expected to control such bulk precipitation better than formamide. Iodide, a strong complex for Hg (and successfully used to deposit HgS, as described earlier), resulted in film deposition but with poor reproducibility. 

The combustion of polyacrylonitrile produces hydrogen cyanide. Any of the chlorine-containing polymers will produce hydrogen chloride upon combustion. This would include polyvinyl chloride and polyvinylidene chloride. 

Attacks most rubbers and plastics, but polyvinyl alcohol has high resistance to permeation. Thermal decomposition releases toxic fumes of nitrogen oxides and hydrogen cyanide. On small fires, use dry chemical powder (such as Purple-K-Powder), foam, AFFF, or COj extinguishers. 

ETHYL CYANIDE (107-12-0) Forms explosive mixture with air (flash point 36°F/2°C). Reacts with water, steam, or acid, producing hydrogen cyanide fumes. Reacts violently with oxidizers, reducing agents, strong acids, caustic materials. Incompatible with A-bromo-succinimide, sodium nitrate. Attacks most mbbers and plastics, but polyvinyl alcohol has high resistance to permeation. 

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