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In organosilicon chemistry, polysilazanes are polymers in which silicon and nitrogen atoms alternate to form the basic backbone (···−Si−N−Si−N−···).Since each silicon atom is bound to two separate nitrogen atoms and each nitrogen atom to two silicon atoms, both chains and rings of the formula [R 2 Si−NR] n occur.
Sodium polyacrylate is an oral safe food additive approved by the Food and Drug Administration (FDA) and has repeated carboxylate groups along its molecular chain. As a result, the acid buffering effect of sodium polyacrylate could be better than small molecular acid.
Similar products [ edit ] Other manufacturers have developed similar products including the French Arc Holdings 's Kwarx since 2006, [ 11 ] the German Glaskoch [ de ] (Leonardo) Teqton since 2009 [ 12 ] and the South-Korean SK Chemicals ' Ecozen , a glycol-modified polyethylene terephthalate (PETG) since 2010/2011. [ 13 ]
Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. [1] Three steps are involved: nitrocarburize ("quench"), polish, and post-oxidize ("quench"). [2]
In terms of modern finishing products, finishes based on shellac dissolved in alcohol are often called shellac or lac to distinguish them from synthetic lacquer, often called simply lacquer, which consists of synthetic polymers (such as nitrocellulose, cellulose acetate butyrate ("CAB"), or acrylic resin) dissolved in lacquer thinner, a mixture ...
To make polyoxymethylene homopolymer, anhydrous formaldehyde must be generated. The principal method is by reaction of the aqueous formaldehyde with an alcohol to create a hemiformal, dehydration of the hemiformal/water mixture (either by extraction or vacuum distillation) and release of the formaldehyde by heating the hemiformal.
As electropolishing can also be used to sterilize workpieces, the process plays an essential role in the food, medical, and pharmaceutical industries. [5] It is commonly used in the post-production of large metal pieces such as those used in drums of washing machines, bodies of ocean vessels and aircraft, and automobiles.
PVAc is considered a food-safe material, [6] and is thus used often in such applications (e.g., in food packaging material). Uses: As wood glue, PVAc is known as "white glue" and the yellow as "carpenter's glue". As paper adhesive during paper packaging conversion.
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