PHASE-BEHAVIOR OF POLY(ETHYLENE-1-BUTENE) IN SUBCRITICAL AND SUPERCRITICAL PROPANE - ETHYL BRANCHES REDUCE SEGMENT ENERGY AND ENHANCE MISCIBILITY

Citation
Sj. Chen et al., PHASE-BEHAVIOR OF POLY(ETHYLENE-1-BUTENE) IN SUBCRITICAL AND SUPERCRITICAL PROPANE - ETHYL BRANCHES REDUCE SEGMENT ENERGY AND ENHANCE MISCIBILITY, Macromolecules, 28(6), 1995, pp. 1812-1817
Citations number
14
Categorie Soggetti
Polymer Sciences
Journal title
ISSN journal
00249297
Volume
28
Issue
6
Year of publication
1995
Pages
1812 - 1817
Database
ISI
SICI code
0024-9297(1995)28:6<1812:POPISA>2.0.ZU;2-3
Abstract
On the basis of experimental batch-cell data, increasing short-chain b ranch density is found to reduce the cloud-point pressure of poly(ethy lene-1-butene) solutions in propane, by as much as a factor of 3. This trend is captured by a SAFT approximation via an effective segment en ergy that depends on the branch density. Increasing branch density is found to decrease the effective segment energy and, hence, to make it closer to that of propane, which is consistent with the enhanced misci bility of branchy poly(ethylene-1-butenes) in propane.