Continuous polymer fractionation of poly(methyl vinyl ether) and a new Kuhn-Mark-Houwink relation
✍ Scribed by Hans-Michael Petri; Andreas Stammer; B. A. Wolf
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 568 KB
- Volume
- 196
- Category
- Article
- ISSN
- 1022-1352
No coin nor oath required. For personal study only.
✦ Synopsis
Continuous polymer fractionation (CPF) -a new large-scale methodwas applied to the technical poly(methy1 vinyl ether) (PVME) using toluene as solvent and petroleum ether as nonsolvent. TWO different devices served as fractionation apparatus, namely a column packed with glass beads and a set of mixer-settler extractors. Advantages and draw-backs of these devices are discussed. The experiments yielded numerous PVME fracti?ns, varying in molar mass from 22 to 87 kg/mol and in molecular non-uniformity U = (M,,,/M,) -1 from 0,25 to 0,41 according to gel-permeation chromatography as compared with ca. U = 1,30 for the starting material. The following Kuhn-Mark-Houwink relation was established for PVME in ethyl methyl ketone at 30 "C: [q]/(mL/g) = 2,6 * @,86.