A quantitative study of the volume changes resulting from pressure-inducedunfolding of m-phenylene ethynylene foldamers in solid PMMA and PtBMA

Authors
Zhu, A Mio, MJ Moore, JS Drickamer, HG
Citation
A. Zhu et al., A quantitative study of the volume changes resulting from pressure-inducedunfolding of m-phenylene ethynylene foldamers in solid PMMA and PtBMA, CHEM P LETT, 342(3-4), 2001, pp. 337-341
Citations number
5
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
342
Issue
3-4
Year of publication
2001
Pages
337 - 341
Database
ISI
SICI code
0009-2614(20010713)342:3-4<337:AQSOTV>2.0.ZU;2-P
Abstract
We have measured the change of the equilibrium constant with pressure for f our foldamers of m-phenylene ethynylene. From the change in ln K over short pressure intervals, we have extracted the change in partial molar volume v s pressure in polymethylmethacrylate (PMMA) and polytertbutylmethacrylate ( PtBMA). For a given foldamer the ratio of Delta(V) over bar' in the two med ia is larger for shorter oligomers. The effect of replacing hydrogen by CH3 in the foldamer is greater in PMMA than in PtBMA. In a given medium, the D elta(V) over bar' per monomer unit is essentially independent of the chain length. (C) 2001 Elsevier Science B.V. All rights reserved.