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Viscosity-temperature relationships for dilute solutions of bisphenol a polycarbonate

✍ Scribed by W.R. Moore; M.A. Uddin

Publisher
Elsevier Science
Year
1967
Tongue
English
Weight
317 KB
Volume
3
Category
Article
ISSN
0014-3057

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✦ Synopsis

Values of Q and A in the expression ~ = A exp (Q/RT)have been obtained for dilute solutions of fractions of a Bisphenol A polyearbonate in five solvents. The apparent activation energy of viscous flow Q varies with concentration c and molecular weight M according to

where Q0 refers to the solvent and K, is solvent dependent. Values of K, are of similar order of magnitude to those for solutions of flexible chain polymers and considerably less than those obtained with stiff chains. The variation of A with c and M

A= Ao+ K~Mc ~

where A0 refers to solvent and Ka and ~ are solvent dependent is that obtained for flexible chain polymers. Values of K, tend to be somewhat smaller than for other flexible polar polymers. It is concluded that the chains of Bisphenol A polycarbonate in dilute solutions are flexible although somewhat less so than those of such polymers as polyvinyl acetate and polymethyl methaerylate.

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