@article{appaw_gilbert_khan_2007, title={Viscoelastic behavior of cellulose acetate in a mixed solvent system}, volume={8}, ISSN={["1526-4602"]}, DOI={10.1021/bm0611681}, abstractNote={The effect of increasing water composition on the rheological and microstructural behavior of a ternary cellulose acetate (CA)/N,N-dimethylacetamide (DMA)/water system is examined. Addition of water to the CA/DMA system results in enhanced steady shear viscosity and dynamic viscoelastic properties and ultimately to phase-separated gel formation. The changes in dynamic rheological behavior of the system during gelation correlate well with the combined solubility parameter (delta) and, in particular, the Hansen hydrogen-bonding solubility parameter index (delta(h)) of the solvent system, suggesting hydrogen-bonding interactions may be the major route initiating the sol-gel process. For all gels studied, the elastic modulus and the critical stress to yield shifts to higher values with increasing CA concentration and/or water content. In addition, the elastic modulus exhibits a power-law behavior with water content, with the same power-law exponent observed for gels containing different CA concentrations. Addition of water leads to formation of a denser gel network, as evidenced from direct visualization of the gel microstructure through confocal microscopy.}, number={5}, journal={BIOMACROMOLECULES}, author={Appaw, Collins and Gilbert, Richard D. and Khan, Saad A.}, year={2007}, month={May}, pages={1541–1547} }
 @article{appaw_gilbert_khan_kadla, title={Phase separation and heat-induced gelation characteristics of cellulose acetate in a mixed solvent system}, volume={17}, number={3}, journal={Cellulose}, author={Appaw, C. and Gilbert, R. D. and Khan, S. A. and Kadla, J. F.}, pages={533–538} }