Intrinsic viscosity and molecular weight of isotactic polypropylene
1960; Wiley; Volume: 38; Issue: 1 Linguagem: Inglês
10.1002/macp.1960.020380103
ISSN0025-116X
AutoresPaolo Parrini, Francesco Sebastiano, Giuseppe Messina,
Tópico(s)Polymer Nanocomposites and Properties
ResumoAbstract Two samples of highly isotactic polypropylene prepared by a NATTA's catalysis, have been fractionated by a column fractionation technique. Fractions having M̄ w /M̄ n ratio very small (1.14 – 1.27) have been obtained and used for the determination of [η]−M̄ n and [η]−M̄ w relations. Because of the small values of M̄ w /M̄ n ratio, the [η]−M̄ w relation may be assumed also valuable as [η]−M relation. This relation is for molecular weight range of 40,000–650,000, where [η] is measured in tetralin at 135°C. Moreover values of \documentclass{article}\pagestyle{empty}\begin{document}$\sqrt {\overline {r_z^2 } }$\end{document} and of second virial coefficients A 2 are given in function of molecular weight.
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