Physical studies of ionically-terminated polytetrahydrofuran—II. Application of the Mark-Houwink relation and determination of unperturbed molecular dimensions
✍ Scribed by S.A.M. Ali; D.J. Hourston
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 558 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
Abstraet--Tetrahydrofuran polymers terminated at one end with a pyridinium bromide group were prepared and their hydrodynamic behaviour contrasted with the equivalent methoxy-terminated polymers. The hydrodynamic behaviour of methoxy-terminated polytetrahydrofuran in cyclohexane, toluene, tetrahydrofuran, methyl ethyl ketone and cyclohexanone and (pyridinium bromide)-termined polytetrahydrofuran in tetrahydrofuran, methyl ethyl ketone and cyclohexanone was consistent with that of partially free-draining random coils. In cyclohexane and toluene, the pyridinium bromide-terminated polymers possess aggregated structures (multiplets). These multiplets contain between 2 to 3 ionic chain ends.