Phase separation of polymer solutions. The calculation of the cloudpoint curve with a concentration and temperature-dependent free energy correction parameter
✍ Scribed by P.T. van Emmerik; C.A. Smolders
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 517 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0014-3057
No coin nor oath required. For personal study only.
✦ Synopsis
The free enthalpy correction parameter g in the Flory-Huggins equation for the Gibbs free enthalpy of mixing in polymer solutions is considered generally as a concentration-and temperature-independent parameter. It has been extended here with linear concentration-and temperaturedependent terms. With these parameters, six different types of cloudpoint curves can be predicted. Using the experimental cloudpoint curve for solutions of poly(2,6-dimethyl-l,4-phenylene oxide) in toluene up to about 70 per cent by weight of polymer, a set of g-parameters is obtained, accounting for concentration and temperature dependence. With the parameters thus obtained, the melting point curve has been calculated which agrees very well with the experimental melting points for this system. * The free enthalpy of mixing AGm stands for Gibbs free energy change.
PPO.