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- W1999509430 abstract "Abstract Viscosities of solutions of six fractions of cellulose tributylate in 1,2,3-trichloropropane have been measured over a wide range of concentrations up to a weight fraction of 0.41 and at several different temperatures between −5° and 50°C. The apparent activation energy for viscous flow was a single function of the product of concentration in grams per cubic centimeter ( c ) and molecular weight ( M ) over the range of cM from 0 to 20,000, and in this range it increased by about 5 kcal., but at higher concentrations comparatively little. At 25°C., the relative viscosity was a single function of c 5 M 3.4 , and at high values of this argument was directly proportional to it. The results of these and measurements on other polymers are discussed in relation to the average number of entanglement points per molecule in Bueche's sense. The average molecular weight between entanglement points in cellulose tributylate, extrapolated to the undiluted state, is estimated as about 10,000. It is concluded that the monomeric friction coefficient for translation of a polymer segment is proportional to the solvent viscosity and to the 1.6 power of the polymer concentration." @default.
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- W1999509430 date "1957-08-01" @default.
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- W1999509430 title "Viscosities of concentrated polymer solutions. IV. Cellulose tributyrate" @default.
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- W1999509430 doi "https://doi.org/10.1016/0095-8522(57)90039-9" @default.
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