Interaction parameters and miscibility limits of poly(dimethylsiloxane) and dinonyl phthalate or squalane determined from studies of the absorption of hexane by the binary liquid mixtures

Anthony J. Ashworth, Gareth J. Price

Research output: Contribution to journalArticle

Abstract

Hexane has been used as a probe molecule to determine the interactions in liquid mixtures consisting of poly(dimethylsiloxane) (PDMS) and a large monomeric molecule, dinonyl phthalate (DNP) or squalane (SQ), by measuring the absorption of hexane at 303 K into mixtures of the involatile liquids on a vacuum microbalance. Five samples of PDMS of number-average molecule weights varying from 3350 to 89000 have been studied. The measurements for the ternary liquid mixtures formed have been analysed and shown to give consistent interaction parameters between the involatile components. These are used to predict miscibility limits to within on average 3% for the DNP+PDMS systems and 4% for the SQ+PDMS systems. In general, Flory-Huggins theory based on volume fractions gave a better fit to the experimental results and a better estimation of the cloud points of the partially miscible mixtures than that using segment fractions as in the later Flory theory. In predicting the miscibility limits it was assumed that the polymer concentration in the polymer-dilute phase was zero, so that a tangent could be drawn to the free-energy curve for the system through the origin to find the composition of the polymer-rich phase. The approach is shown to be valid for the systems studied.

Original languageEnglish
Pages (from-to)473-483
Number of pages11
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Volume81
Issue number2
DOIs
Publication statusPublished - 1 Dec 1985

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

@article{224e9eee9f11403598480cb9e3c226f9,
title = "Interaction parameters and miscibility limits of poly(dimethylsiloxane) and dinonyl phthalate or squalane determined from studies of the absorption of hexane by the binary liquid mixtures",
abstract = "Hexane has been used as a probe molecule to determine the interactions in liquid mixtures consisting of poly(dimethylsiloxane) (PDMS) and a large monomeric molecule, dinonyl phthalate (DNP) or squalane (SQ), by measuring the absorption of hexane at 303 K into mixtures of the involatile liquids on a vacuum microbalance. Five samples of PDMS of number-average molecule weights varying from 3350 to 89000 have been studied. The measurements for the ternary liquid mixtures formed have been analysed and shown to give consistent interaction parameters between the involatile components. These are used to predict miscibility limits to within on average 3{\%} for the DNP+PDMS systems and 4{\%} for the SQ+PDMS systems. In general, Flory-Huggins theory based on volume fractions gave a better fit to the experimental results and a better estimation of the cloud points of the partially miscible mixtures than that using segment fractions as in the later Flory theory. In predicting the miscibility limits it was assumed that the polymer concentration in the polymer-dilute phase was zero, so that a tangent could be drawn to the free-energy curve for the system through the origin to find the composition of the polymer-rich phase. The approach is shown to be valid for the systems studied.",
author = "Ashworth, {Anthony J.} and Price, {Gareth J.}",
year = "1985",
month = "12",
day = "1",
doi = "10.1039/F19858100473",
language = "English",
volume = "81",
pages = "473--483",
journal = "Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases",
issn = "0300-9599",
publisher = "Royal Society of Chemistry",
number = "2",

}

TY - JOUR

T1 - Interaction parameters and miscibility limits of poly(dimethylsiloxane) and dinonyl phthalate or squalane determined from studies of the absorption of hexane by the binary liquid mixtures

AU - Ashworth, Anthony J.

AU - Price, Gareth J.

PY - 1985/12/1

Y1 - 1985/12/1

N2 - Hexane has been used as a probe molecule to determine the interactions in liquid mixtures consisting of poly(dimethylsiloxane) (PDMS) and a large monomeric molecule, dinonyl phthalate (DNP) or squalane (SQ), by measuring the absorption of hexane at 303 K into mixtures of the involatile liquids on a vacuum microbalance. Five samples of PDMS of number-average molecule weights varying from 3350 to 89000 have been studied. The measurements for the ternary liquid mixtures formed have been analysed and shown to give consistent interaction parameters between the involatile components. These are used to predict miscibility limits to within on average 3% for the DNP+PDMS systems and 4% for the SQ+PDMS systems. In general, Flory-Huggins theory based on volume fractions gave a better fit to the experimental results and a better estimation of the cloud points of the partially miscible mixtures than that using segment fractions as in the later Flory theory. In predicting the miscibility limits it was assumed that the polymer concentration in the polymer-dilute phase was zero, so that a tangent could be drawn to the free-energy curve for the system through the origin to find the composition of the polymer-rich phase. The approach is shown to be valid for the systems studied.

AB - Hexane has been used as a probe molecule to determine the interactions in liquid mixtures consisting of poly(dimethylsiloxane) (PDMS) and a large monomeric molecule, dinonyl phthalate (DNP) or squalane (SQ), by measuring the absorption of hexane at 303 K into mixtures of the involatile liquids on a vacuum microbalance. Five samples of PDMS of number-average molecule weights varying from 3350 to 89000 have been studied. The measurements for the ternary liquid mixtures formed have been analysed and shown to give consistent interaction parameters between the involatile components. These are used to predict miscibility limits to within on average 3% for the DNP+PDMS systems and 4% for the SQ+PDMS systems. In general, Flory-Huggins theory based on volume fractions gave a better fit to the experimental results and a better estimation of the cloud points of the partially miscible mixtures than that using segment fractions as in the later Flory theory. In predicting the miscibility limits it was assumed that the polymer concentration in the polymer-dilute phase was zero, so that a tangent could be drawn to the free-energy curve for the system through the origin to find the composition of the polymer-rich phase. The approach is shown to be valid for the systems studied.

UR - http://www.scopus.com/inward/record.url?scp=2042482314&partnerID=8YFLogxK

U2 - 10.1039/F19858100473

DO - 10.1039/F19858100473

M3 - Article

VL - 81

SP - 473

EP - 483

JO - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

JF - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

SN - 0300-9599

IS - 2

ER -