Elastoviscous properties

Andrews,R.D., Tobolsky.A. V. Elastoviscous properties of pdyisobutylene. IV. Relaxation time spectrum and calculation of bulk viscosity. J. Polymer Sci 7, 221-242 (1951). 

Braudo, E. E., Plashchina, I. G., and Tolstoguzov, V. B. 1984. Stmctural characterisation of thermoreversible anionic polysaccharide gels by their elastoviscous properties. Carbohydr. Polym. 4 23-48. 

Andrews, R.D., Hoftnan-Bang, N. and Tobolsky, A.V. (1948) Elastoviscous properties of poly (isobutylene) relaxation of stress in whole polymer of different molecular weights at elevated temperature, /. Polym. Set., 3,669-92. 

Hence, mucocihary transport is a complex interaction of ciliary beat and elastoviscous properties of the overlaying mucus and its (dis)continuity in the various airway generations. Mucociliary action is an important function of the airway walls, and the determination of this function is essential to assess the functional and structural integrity of the conducting airways. To study this function, suitably labeled particles are deposited in the airways and mucus transport is determined by external measurement of the label. 

A further important property which may be shown by a non-Newtonian fluid is elasticity-which causes the fluid to try to regain its former condition as soon as the stress is removed. Again, the material is showing some of the characteristics of both a solid and a liquid. An ideal (Newtonian) liquid is one in which the stress is proportional to the rate of shear (or rate of strain). On the other hand, for an ideal solid (obeying Hooke s Law) the stress is proportional to the strain. A fluid showing elastic behaviour is termed viscoelastic or elastoviscous. 

G) Viscoelastic liquid or elastoviscous solid. These phases have both the properties of liquids and of solids they can flow under the influence of stress, but show, in addition, restoring forces. Many polymer solutions, and also surfactant solutions, show viscoelastic properties. 

---