Abstract
The behavior of ultrahigh-molecular-weight poly(methyl methacrylate) (Mw = 9.564 X 106 to 23 X 106) in dilute solution in toluene, chloroform, and dimethylformamide at 25°C has been investigated by viscom-etry; the chloroform solutions were also studied by light scattering at 20°C. The corresponding Mark-Houwink relations have been established and the unperturbed dimensions have been determined by the extrapolation methods of Lenka, and Stockmayer-Fixman and Burchard. A correction term, depending on the a exponent of the Mark-Houwink relation, was proposed to be introduced into the Stockmayer- Fixman-Burchard equation. The correlation between this correction term and the flexibility of polymethacrylates is discussed using present and previous data. * See Ref. 6 for Part 20.
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