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Title:
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Viscosity, molecular weight and concentration relationships at 298K of low molecular weight cis-polyisoprene in a good solvent |
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Author:
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Kwaambwa, H.M.; Goodwin, J.W.; Hughes, R.W.; Reynolds, P.A. |
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Abstract:
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Aseries of six well characterised homopolymers of cis-polyisoprene (PIP) ranging from 1180 to 115,000 molecular weight were utilised to explore
viscosity and the scaling relationship between viscosity and concentration in dodecane (good solvent). For each polymer molecular weight, the
relative viscosity of PIP in dodecane at 298K was measured at several polymer concentrations using capillary viscometry. The linear extrapolation
of experimental data based on Huggins, Kramer, Martin and Schulz-Blaschke equations was used to find the intrinsic viscosity at infinite dilution for
each polymer molecular weight. The single-point method of evaluation of the intrinsic viscosity was also used for comparison. The Mark-Houwink
fit of the data gave power index of 0.72 indicating that dodecane is good solvent for PIP and the latter exists in solution as open flexible coil. Both the
radius of gyration and critical chain overlap concentration, c*, were derived from measured intrinsic viscosities. Plot of the relative viscosities versus
the scaled concentration c/c*, resulted in single curve with slope value 4.44×10−2 and correlation coefficient r2 = 0.996, indicating good linear fit. |
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URI:
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http://hdl.handle.net/10311/328
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Date:
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2007 |
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Publisher:
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Elsevier B.V. www.elsevier.com/locate/colsurfa |
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xmlui.dri2xhtml.METS-1.0.item-type:
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Published Article |