Viscosity-temperature relationships for dilute solutions of cellulose derivatives: I. Temperature dependence of solution viscosities of ethyl cellulose
✍ Scribed by W.R Moore; A.M Brown
- Book ID
- 107883796
- Publisher
- Elsevier Science
- Year
- 1959
- Weight
- 483 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0095-8522
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## Abstract Viscosity measurements were made for dilute solutions of three grades of cellulose acetate (acetyl content 39.8%, molecular weight M̄~__v__~ 30270 to 46250) in acetone in the temperature __t__ range of 10° to 35°C. The data satisfied the Mark‐Houwink equation, [η] = __K__M̄, where [η] =
Values of Q and A in the expression ~ = A exp (Q/RT)have been obtained for dilute solutions of fractions of a Bisphenol A polyearbonate in five solvents. The apparent activation energy of viscous flow Q varies with concentration c and molecular weight M according to where Q0 refers to the solvent a