Viscosities of concentrated polymer solutions. IV. Cellulose tributyrate

摘要: Abstract Viscosities of solutions six fractions cellulose tributylate in 1,2,3-trichloropropane have been measured over a wide range concentrations up to weight fraction 0.41 and at several different temperatures between −5° 50°C. The apparent activation energy for viscous flow was single function the product concentration grams per cubic centimeter ( c ) molecular M cM from 0 20,000, this it increased by about 5 kcal., but higher comparatively little. At 25°C., relative viscosity 3.4 , high values argument directly proportional it. results these measurements on other polymers are discussed relation average number entanglement points molecule Bueche's sense. tributylate, extrapolated undiluted state, is estimated as 10,000. It concluded that monomeric friction coefficient translation polymer segment solvent 1.6 power concentration.