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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 8, Number 4
BKCSDE 8(4)
April 20, 1987 

 
Title
Non-Newtonian Intrinsic Viscosities of Biopolymeric and Non-biopolymeric Solutions (Ⅱ)
Author
Chun Hag Jang, Chang Hong Kim, Taikyue Ree*
Keywords
Abstract
This paper is a continuation of our previous paper1, and deals with Eq.(1) (see the text), which was theoretically derived in the paper1, [η ]f and [η]0 is the intrinsic viscosity at stress f and f = O, respectively. Equation (1) predicts how [η]f / [η]0 changes with stress f, relaxation time β2 of flow unit 2 and a constant c2 related with the elasticity of molecular spring of flow unit 2. In this paper, Eq.(1) is applied to a biopolymer, e.g., poly (γ-benzyl L-glutamate), and nonbiopolymers, e.g., polyisobutylene, polystyrene, polydimethylsiloxane and cellulose triacetate. It was found that the c2 factor is zero for non-biopolymers while c2 ≠ 0 for biopolymers as found previously1. Because of the non-Newtonian nature of the solutions, the ratio [η]f / [η]0 drops from its unity with increasing f. We found that the smaller the β2, the larger the fc at which the viscosity ratio drops from the unity, vice versa.
Page
332 - 335
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