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Plastic bag development historyⅠ

May 28, 2018

Cybertron found the plasticity of nitrocellulose, and the things it made were impermeable. He used it to create some beautiful rice bowls, cups, bottles and teapots with great interest. He admired his own masterpieces and also wrote a letter to his good friend Faraday, the famous scientist. Unfortunately, Faraday did not care until the appearance of a photographer. Photographer Alexander Parks has many hobbies and photography is one of them. In the 19th century, people were still unable to purchase ready-made photographic films and chemicals like today. They must often make their own needs. So every photographer must also be a chemist.

The "ancestor" of this magical material is the most abundant cellulose in plants.

In 1845, when chemist Sepertan, who lives in Basel, a Swiss city in the northwest of Switzerland, accidentally bumped into concentrated sulphuric acid and concentrated nitric acid on the table during an experiment at home, he hurriedly picked up his wifes cloth apron to wipe the table. Mixed acid. After a hectic schedule, he hung the apron to the stove and baked it. Unexpectedly, the apron slammed and it turned into an ashes. Cybertron returned to the laboratory with this "major discovery" and repeated "accidents." After many tests, Cybertron finally found the reason: The main ingredient of the cloth apron was cellulose, which was in contact with a mixture of concentrated nitric acid and concentrated sulfuric acid to produce nitrocellulose ester, which was later widely used nitrocellulose.

One of the materials used in photography is "gum cotton", which is a "nitrocellulose" solution, ie a cellulose nitrate solution in alcohol and ether. At the time it was used to stick photosensitive chemicals to the glass to make equivalents to today's photographic film.