Abstract
Using an elongational flow technique, we have investigated the relationship between the molecular conformational relaxation time and the molecular weight for a solvent whose quality was altered thermally from near θ to a good solvent state. The materials used were closely monodisperse samples of atactic polystyrene. The results show that the relaxation time τ varies with the molecular weight M as τ ∝ M1.5, independent of the solvent quality, a result which apparently is at variance with the observed molecular weight dependence of intrinsic viscosity. Despite this invariance of the molecular weight exponent with solvent quality, our results also show that the coils do expand when the solvent quality was increased in agreement with the mean‐field theory of Flory.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 335-340 |
| Number of pages | 6 |
| Journal | Journal of Polymer Science Part B: Polymer Physics |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| State | Published - Mar 30 1992 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry
- Polymers and Plastics
- Physical and Theoretical Chemistry
Keywords
- molecular weight dependence of relaxation of dissolved polystyrene in elongational flow
- polystyrene, monodisperse atactic, relaxation in elongational flow in solutions of
- relaxation of dissolved polystyrene molecules in elongated flow