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982203 
Journal Article 
The Rheological Properties of Poly(acrylonitrile)/Cellulose Acetate Blend Solutions in N,N-Dimethyl Formamide 
Park, SH; Song, IK; Kim, BC 
2009 
1 
Polymer - Korea
ISSN: 0379-153X 
33 
4 
384-388 
English 
WOS:000268476000017 
The theological properties of poly (acrylonitrile) (PAN) and cellulose acetate (CA) blend solutions in N,N-dimethyl formamide (DMF) were investigated in terms of temperature and blend composition. The Solutions exhibited a very characteristic rheological behavior with variation of temperature. 8 wt% Solution showed an increase of viscosity and a decrease of loss tangent as temperature was increased over the temperature range of 20 and 60 degrees C. At 20 degrees C the physical properties of the solutions exhibited dependence on the blend composition. At 40 and 60 degrees C, however, the effects of blend ratio on the physical properties notably diminished. The longer relaxation time at higher temperature indicated that the fort-nation of physical structures resulting from intermolecular interactions was promoted with increasing temperature. The odd rheological responses were further elucidated by measuring of the physical properties of dilute Solutions. The intrinsic viscosity of the solutions suggested that the coiled chain dimension was reduced with increasing temperature.