𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Untersuchungen zur thermodynamik und konformation von makromolekülen in polymermischungen in der nähe von entmischungspunkten durch neutronenbeugung

✍ Scribed by Schmitt, Burghard J. ;Kirste, Rudolf G. ;Jelenič, Jernej


Publisher
Wiley (John Wiley & Sons)
Year
1980
Weight
764 KB
Volume
181
Category
Article
ISSN
0025-116X

No coin nor oath required. For personal study only.

✦ Synopsis


Abstract

The structure and the thermodynamics of polymer blends made from two poly(styrene/acrylonitrile) copolymers with a different ratio of styrene/acrylonitrile are investigated by neutron scattering. These systems are endothermic, exhibit a positive value for the Huggins parameter χ and show phase separation at sufficiently large molecular weights. The results are in good agreement with the corresponding states theory of Prigogine and Patterson. Other polymer blends are exothermic, exhibit negative χ‐values and are compatible even for infinitely large molecular weights. In these cases one can adapt the theoretical equations to the experiments by the introduction of a suitable parameter for an exothermic contact energy. This is shown for blends from poly(methyl methacrylate) and poly(styrene/acrylonitrile).


📜 SIMILAR VOLUMES


Transformationsreaktionen ausgewählter M
✍ Woggon, H. ;Klein, S. ;Jehle, D. ;Zydek, G. ;Knoll, R. 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 582 KB

Nach einleitenden Informationen anhand der Literatur zu Fragen der Biotransformationsreaktionen von Quecksilberverbindungen werden eigene Untersuchungsergebnisse dargestellt, nach denen bei aerober Inkubation sowohl von Boden als auch von reinen Fungi-Stammen (Aspergillus, Penicillium, Alternuria) s