Abstract
An attempt was made to determine the unperturbed chain dimension A of a segment polyurethane, prepared from polytetramethylene glycol (the number-average molecular weight 1500) methylene bis(4-phenyl isocyanate) and ethylenediamine. A whole polymer was fractionated by successive solution fractionation using dimethylacetamide (DMAc) as a solvent and methylalcohol as a precipitant into 23 fractions. Linearity of the segment polyurethane chain was confirmed by NMR and the solution viscosity change by addition of n-butylamine. The dilute solution properties of eight fractions in DMAc were investigated by the light scattering and viscometry at 25°C. The Mark–Houwink–Sakurada equation for the solution in DMAc at 25°C was [η]=0.101Mw0.59 (cm3 g−1) ([η]; limiting viscosity number, Mw; the weight-average molecular weight). A was found to be 1.02×108 cm for the solution. No significant solvation was observed by adiabatic compressibility measurement.
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Kamide, K., Kiguchi, A. & Miyazaki, Y. Viscometric and Light Scattering Study in Dimethylacetamide of Linear Segment Polyurethane, Polymerized with Methylene Bis(4-phenyl isocyanate) Polytetramethylene Glycol and Ethylene Diamine. Polym J 18, 919–925 (1986). https://doi.org/10.1295/polymj.18.919
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DOI: https://doi.org/10.1295/polymj.18.919