Phase equilibrium and conformation of a polymer in a binary solvent

Kiwing To,, C.K. Chan and H.J. Choi

Physica A: Statistical Mechanics and its Applications, 1995, vol. 221, issue 1, 223-232

Abstract: The phase equilibrium behavior of a dilute high molecular weight polymer (poly-ethylene oxide PEO, molecular weight 9 × 105, concentration 0.001 g/cc) solution in a two-component liquid mixture (isobutyric acid + water, IBAW) is studied experimentally. Far above the critical temperature Tc of IBAW, we found that although PEO dissolved in pure isobutyric acid (IBA) and pure water, mixtures of IBA and water with 0.1% PEO became cloudy within a certain composition range. Far below Tc, when the binary mixture phase separates in two coexisting phases, the presence of PEO which dissolved in both phases did not affect the coexistence curve of the binary mixture. Around Tc, three phases in coexistence were obsrrved in a narrow composition range near the critical composition of IBAW. At high temperature (≈ 24°C above Tc) the size of PEO in IBAW was measured by light scattering method at different IBAW compositions. We observed expansion of PEO molecules in the mixed solvent, which can be explained using the single liquid approximation by Scott. Such an expansion caused the macromolecules to overlap and separate from the solvent.

Date: 1995
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/037843719500268C
Full text for ScienceDirect subscribers only. Journal offers the option of making the article available online on Science direct for a fee of $3,000

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:221:y:1995:i:1:p:223-232

DOI: 10.1016/0378-4371(95)00268-C

Access Statistics for this article

Physica A: Statistical Mechanics and its Applications is currently edited by K. A. Dawson, J. O. Indekeu, H.E. Stanley and C. Tsallis

More articles in Physica A: Statistical Mechanics and its Applications from Elsevier
Bibliographic data for series maintained by Catherine Liu ().