AbstractAn isotactic polybutene‐1 was fractionated, and melting points of several fractions were determined. The fractions were studied by light‐scattering and viscosity techniques. The parameters in the Mark‐Houwink equation are η η 4.73 × 10−5M w0.80in heptane at 35°C., η = 1.50 × 10−4M w0.69in heptane at 60°C., and η = 9.49 × 10−5M w0.73in decalin at 115°C. The molecular weight range studied
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