Search results
Results from the WOW.Com Content Network
Cellulose triacetate, triacetate, CTA or TAC is a chemical compound produced from cellulose and a source of acetate esters, typically acetic anhydride. Triacetate is commonly used for the creation of fibres and film base .
Cellulose acetate film, made from cellulose diacetate and later cellulose triacetate, was introduced in 1934 as a replacement for the cellulose nitrate film stock that had previously been standard. When exposed to heat or moisture, acids in the film base begin to deteriorate to an unusable state, releasing acetic acid with a characteristic ...
Cellulose diacetate film was first created by the German chemists Arthur Eichengrün and Theodore Becker, who patented it under the name Cellit, from a process they devised in 1901 for the direct acetylation of cellulose at a low temperature to prevent its degradation, which permitted the degree of acetylation to be controlled, thereby avoiding total conversion to its triacetate.
In the literature of photography "acetate" is used as a synonym for several chemicals: cellulose acetate, cellulose triacetate, cellulose diacetate, cellulose acetate propionate, and cellulose acetate butyrate. All have been used separately and in mixtures, to produce film base.
Cellulose acetate is also known as "safety" film and started to replace nitrate film in still photography in the 1920s. [1] There are several types of acetate that were produced after 1925, which include diacetate (c. 1923 – c. 1955), acetate propionate (1927 – c. 1949), acetate butyrate (1936–present), and triacetate (c. 1950 – present). [1]
Cellulose diacetate, sometimes called diacetate, is a synthetic polymer made by treating cellulose with acetic acid. It consists of two acetyl functional groups on each unit of D-anhydroglucopyranose of the cellulose molecule. It was first developed in the United States. It is fragile since it is based on cellulose.
Cellulose acetate; Cellulose acetate butyrate ... Cellulose triacetate; Chlormadinone acetate; Chlormethenmadinone acetate; ... Wikipedia® is a registered trademark ...
The formation of coex has been proven possible on wood and semi-synthetic fibers such as cellulose acetate, cellulose triacetate, viscose, modal, lyocell and cupro. The material is obtained by sulfation and phosphorylation reactions on glucan units linked to each other in position 1,4.