CELLULOSICS Chemische Eigenschaften,Einsatz,Produktion Methoden
Beschreibung
Cellulosic materials are thermoplastics derivatives of cellulose. The raw material for the industrial preparation of cellulosics is natural cellulose, itself a natural polymer, i.e., a polysaccharide chain (C6 H10O5 )n, with ca. 3500 glucosidic monomer units which is found extensively in plants and woods. In plants, cellulose acts as a structural reinforcement material. Actually, natural cellulose exhibits no plasticity because of the cross-linking existing between two polysaccharide chains. This reticulation is ensured by hydrogen bonds between two adjacent alcohol functions. Therefore, in order to become plastic, the alcohol functions of the cellulose must be converted either by esterification by an organic acid or by etherification with another alcohol. The most common esters of cellulose used commercially are the nitrate, acetate, butyrate, acetobutyrate, and propionate while major ethers are methylcellulose, ethylcellulose and benzylcellulose; finally xanthate of cellulose, called rayon, is also produced.
CELLULOSICS Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
