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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 2, Number 4
April 20, 1981 

Rheological Properties of the Solutions of Incompatible Polymer Blends
Jeong In Sohn, Taikyue Ree
A blend polymeric system composed of poly(methyl methacrylate) (PMMA or PM) and polystyrene (PS) dissolved in chloroform was rheologically studied. The viscosities ηbl of the blend system with various blending ratios χ changing from zero (pure PS solution) to unity (pure PMMA solution) were measured at 25℃ as a function of shear rates s by using a Couette type viscometer. ηbl at a given s decreased exponentially with χ reaching asymptotic constant value of ηbl ; ηbl at a given χ is greater at a smaller s. These results are explained by using Ree-Erying's theory of viscosity, ηbl = (x1β1/α1)bl + (x2β2/α2)bl [sinh-1β2(bl) s]/β2(bl)s. The Gibbs activation energy ΔGi≠ (i = 2 for non-Newtonian units) entering into the intrinsic relaxation time βi is represented by a linear combination ΔGi≠(bl) = χΔG≠iPM + (1-χ)ΔG≠iPS;the intrinsic shear modulus[αi]-1 is also represented by [αi(bl)]-1 = χ[αiPM]-1 + (1-χ)[αiPS]-1 and the fraction of area on a shear surface occupied by the ith flow units xi(bl) is similarly represented, i.e., xi(bl) = χxiPM + (1-χ)xiPS. By using these ideas the Ree-Eyring equation was rewritten which explained the experimental results satisfactorily.
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