Single‐point determination of intrinsic viscosity

Abstract

Conventional procedures for the determination of intrinsic viscosity require measurement of specific viscosity at several concentrations followed by extrapolation to infinite dilution. When less precision is required, calculation of the intrinsic viscosity from a single measurement is an attractive Hart' rearranged the equation of Schulz and Blaschke4 in the form:where N is the reciprocal of k in the SchulzBlaschke equation. Hart used a graphical relation between N and specific viscosity in estimating [ q ] from a single measured viscosity.In determining the intrinsic viscosities of stereoregular polybutene-1 samples in Decalin it was found that, intrinsic viscosities could be estimated

Grafting vinyl monomers onto cellulose. I. Graft copolymerization of methyl methacrylate onto cellulose using quinquevalent vanadium ion

“…The intrinsic viscosity was calculated by using a single-point-method for poly(methy1 methacrylate) by Valles et al 63 The molecular weight was obtained from 77 = 9.6 x 10-5~0. 69 The result indicates that the average molecular weight as well as the degree of polymerization increases with an increase in percentage of grafting (Table I).…”

Kinetics of graft copolymerization of methyl methacrylate in wool fibers

“…By using eqs. (1) and (4) or (2) and(5), dso/dt can be calculated for the unreduced or 0.218N TGA-reduced wool fibers, respectively. However, since the powers of [MI0 in these equations give almost the same values, dso/dt is likely to be independent of [M]o.…”