Copper number changes, cotton

Changes in degree of polymerization and copper number of cotton cellulose during cutting with a Wiley mill. 

Figure 2. Changes in degree of polymerization and copper number of cotton cellulose during milling with a Norton ball mill. Key Y, milled fiber V, O,...

Copper Value (Copper Index or Copper Number) of Cellulose It represents the amt of Cu reduced from the cupric to cuprous state in alkaline sola by lOOg of cellulose (such as cotton). In case of cotton, it gives an indication as to whether any appreciable changes have taken place during purification proceduresjin case of woodpulp, it indicates the degree of purity. Accdg to Doree (Ref 4 pp 26 32-3)>normal cotton cellulose has copper values below 0.2 while sulfite pulp has value>2. The alpha-cellulose obtd from sulfite pulp had a value of 0,8... 

The research journals are the primary place where research results are first published. The prices of compounds change rapidly, and are to be found in journals instead of books. The New York Times finance page lists a number of commonly traded metals (aluminum, antimony, copper, gold, iron, lead, mercury, platinum, silver, zinc), food (corn, soya, wheat, rice, sugar), fuels (fuel oil, gasoline, natural gas), and textile (cotton, wool). The Chemical Market Report is a weekly journal that lists the prices of many chemical substances in a supplement, which depend strongly on purity and intended use. 

---