Temperature dependence of limiting viscosity number and radius of gyration of cellulose diacetate in acetone

✍ Scribed by H. Suzuki; Y. Miyazaki; K. Kamide

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 429 KB
• Volume: 16
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(80)90037-3

✦ Synopsis

Abatract--Acetone solutions of a cellulose diacetate fraction were studied by viscosity and light scattering methods over the range 12.6-50.3:. The temperature dependences of the limiting viscosity number [~/], the mean-square radius of gyration , and the second virial coefficient A2 were determined. The unperturbed mean-square radius of gyration ~~o and the expansion factor a, were estimated by using theoretical relations to the interpenetration function. It was found that dlno/dT is -6.4 x 10 -3 deg-t while :t~ is close to unity over the whole temperature range studied. The viscosity results are interpreted to show that the draining effect is not negligible and the Flory viscosity parameter slightly increases with increasing temperature. It is finally concluded that the value of -6.9 × 10 -3 deg-~ for din [~/]/dTcan be ascribable to the rapid decrease in o .~~