Gas Chromatographic Determination of Thermodynamic Properties of Polymer Solutions. II. Semicrystalline Polymer Systems

Brockmeier, Norman F.; McCoy, Robert W.; Meyer, Joachim-Ernst

doi:10.1021/ma60032a005

Cited by 32 publications

(14 citation statements)

References 2 publications

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“…The approximation [l + 241/(2 -2)]z/2 = 1 + z41/(z -2) is used to derive eq. (13) assuming that the polymer concentration is very high (& -0) and z has finite values (3)(4)(5)(6). Comparison of eqs.…”

Section: Table I11mentioning

confidence: 99%

Vapor‐liquid equilibria for polyisobutylene solutions

Saeki

Holste

Bonner

1982

J. Polym. Sci. Polym. Phys. Ed.

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SynopsisVapor sorption isotherms in binary solutions of polyisobutylene (PIB), (M, = 4.7 X lo6 g/mol) in hydrocarbons (cyclopentane; cyclohexane; n-heptane; 2,2-dimethyl butane; and 2,2,4-trimethyl pentane) and chlorinated methanes [carbon tetrachloride (CC4) and chloroform (CHCls)] have been determined at 235°C using the piezoelectric sorption method. The polymer-solvent interaction parameter x obtained agrees with previously published values determined by using gas-liquid chromatography and a quartz-helix vapor sorption apparatus. The Flory theory of corresponding-states has been applied to the experimental results through the x parameter and affords a good prediction of the concentration dependence of x for solutions of chloroform, carbon tetrachloride, n-heptane, and 2,2-dimethyl butane in PIB. The experimental values of [ d ( a 1 / $ l ) / d a l ]~, p for the PIB solutions are constant over the measured concentration range, for example [d(al/$1)/da1]~,p = -4.1 for CC4, -3.65 for CHC13, -3.0 for 2,2-dimethyl butane and n-heptane, -2.7 for 2,2,4-trimethyl pentane, -2.7 for cyclohexane, and -1.7 for cyclopentane, where a1 is the solvent activity and $1 is the solvent segment fraction. The correlations between the values of [ d ( a 1 / $ 1 ) / d a l ]~, p and the theories of Guggenheim, Miller, Huggins, and Flory are discussed.

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Section: Table I11mentioning

confidence: 99%

Vapor‐liquid equilibria for polyisobutylene solutions

Saeki

Holste

Bonner

1982

J. Polym. Sci. Polym. Phys. Ed.

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“…IGC has been successfully used to measure the partition and diffusion coefficients in polymer‐solvent systems 1–7. In addition to infinite dilution measurements, IGC has been extended to finite concentration measurements 8–14. Although Brockmeier et al11 showed that the technique could be operated at high pressure, there was little interest in its application until recently.…”

Section: Introductionmentioning

confidence: 99%

Influence of high pressure gases on polymer‐solvent thermodynamic and transport behavior

Jones

Danner

2008

J of Applied Polymer Sci

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Removal of residual solvent and monomers from a polymer through devolatilization can be the limiting step in production throughput. The process may be made more efficient by the addition of a cosolvent. In this work, the effects of two soluble gases, carbon dioxide, and ethylene, on the solubility and diffusivity of a number of solvents in poly(vinyl acetate) and poly(styrene) have been evaluated. The results indicate that in general the solubilities are reduced by the presence of the soluble gases and the diffusivity is significantly increased, with ethylene having the most pronounced effect. Larger solvent molecules benefit more by the presence of the added gas. The implications of this work are that replacement of noninteracting gases such as air or nitrogen with soluble gases can reduce solvent removal times and increase production rates.

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“…Inverse gas chromatography has a major advantage over drying because experiments are conducted at a single concentration (usually at infinite dilution). However, experiments can be conducted at finite concentrations as shown by several investigators 5, 6, 14–16…”

Section: Introductionmentioning

confidence: 99%