Behaviour of cellulose tricarbanilate in dilute solution

✍ Scribed by J.T. Guthrie; M.B. Huglin; R.W. Richards; V.I. Shah; A.H. Simpson

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 574 KB
• Volume: 11
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(75)90105-6

✦ Synopsis

Cotton linters were subjected to acid hydrolysis for various times and the products fully substituted to yield cellulose tricarbanilate samples (M+ = 0.21 × 106 to 1.1 × 10~'). Intrinsic viscosities were measured in dioxan and methyl ethyl ketone over a range of temperature, and also under 0conditions. Mark-Houwink constants were found to be temperature dependent. Unperturbed dimensions and their temperature coefficient were derived by a number of procedures. The Flory-Huggins interaction parameter/., increased with temperature, thus indicating negative entropies and enthalpies of dilution. The results show that the environment is well displaced from the normal 0-state and is closer to the lower critical solution temperature, which was determined from cloud point measurements to be about 234 = in dioxan.