Pressure-Volume-Temperature Studies of Amorphous and Crystallizable Polymers. I. Experimental

Olabisi, Olagoke; Simha, Robert

doi:10.1021/ma60044a022

Cited by 256 publications

(143 citation statements)

References 5 publications

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“…Since each segment of the molecules and also the holes are assumed to have a constant volume vH, the total volume of the system is given by (15) NHvH represents the free volume of the system and N1 r 1 vH the "hard core" contribution that will be given the symbol V* (16) V*, or more properly, the related specific hard core volume v:P' is considered to be a characteristic parameter of the pure component. Thus, if a value for vH is assumed, eq 16 defines r1 and eq 15 allows the calculation of NH.…”

Section: The Partition Functionmentioning

confidence: 99%

Statistical Thermodynamics of r-Mer Fluids and Their Mixtures

Panayiotou

Vera

1982

Polym J

246

210

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ABSTRACT:A modified fluid-lattice theory of fluids considering a finite quasi-lattice coordination number and a constant lattice site volume for all r-mers is developed. The theory is tested against experimental information on specific volumes, vapor pressures, orthobaric densities and heats of vaporization of pure components. Some common polymers and some typical polymer solvents have been chosen for testing the theory. The theoretical treatment has been extended to mixtures and tested against experimental data on volumes of mixing, heats of mixing, and x interaction parameters of polymer solutions. Results have been compared with those obtained with a two-parameter new Flory theory and with the three-parameter new Huggins theory. Both for pure components and for mixtures, the effect of introducing a non-random quasi-chemical correction is discussed.

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Section: The Partition Functionmentioning

confidence: 99%

Statistical Thermodynamics of r-Mer Fluids and Their Mixtures

Panayiotou

Vera

1982

Polym J

246

210

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“…It is well known that applying pressure to a polymer system can raise the T g . [15][16][17][18] Thus, raising the pressure is similar to lowering the temperature. This procedure permits a more reasonable study of glassy relaxation processes because the resulting higher temperatures allow a rapid exploration of the relaxation paths and the elevated pressure creates a system with less volume and, hence, fewer paths to probe.…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure and temperature on chromophore reorientation in a side-chain nonlinear optical polymer

Strutz

Hayden

1998

J. Polym. Sci. B Polym. Phys.

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“…Comparison of correlations obtained using FH3 (0) and FH6 ( + ) models for combination of trans-and 3,4-IR-PS is less compatible than cis-IR-PS in the presence of toluene.…”

Section: Discussionmentioning

confidence: 98%

Ternary phase equilibria of polystyrene with a second polymer and a solvent

Geveke¹,

Danner²

1993

J of Applied Polymer Sci

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SYNOPSISPhase diagrams including tie lines for nine ternary solvent-polymer-polymer systems have been obtained using size exclusion chromatography. The systems studied were toluenepolystyrene (PS) -isoprene rubber (IR) , toluene-PS-butadiene rubber (BR) , cyclohexane-PS-BR, tetrahydrofuran( T H F ) -PS-poly (methyl methacrylate) (PMMA) , and THF-PSpoly(buty1 methacrylate) (PBMA) at temperatures between 30 and 75°C. The results indicate PS-PMMA is less compatible than PS-PBMA in the presence of THF. Also, the combination of trans-and 3,4-IR-PS is less compatible than cis-IR-PS in the presence of toluene. The original Flory-Huggins model for ternary systems has been modified to account for the concentration dependence of the interaction parameters. The modified Flory-Huggins model consists of two interaction parameters per binary. Using this model, six parameters have been regressed for each of the experimental systems studied. Although the parameters are not physically meaningful, the model and the parameters obtained using it are useful for correlating the experimental phase diagrams. The results obtained using the modified six parameter model are shown to be superior to those obtained using the original three parameter model.

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Pressure-Volume-Temperature Studies of Amorphous and Crystallizable Polymers. I. Experimental

Cited by 256 publications

References 5 publications

Statistical Thermodynamics of r-Mer Fluids and Their Mixtures

Statistical Thermodynamics of r-Mer Fluids and Their Mixtures

Effect of pressure and temperature on chromophore reorientation in a side-chain nonlinear optical polymer

Ternary phase equilibria of polystyrene with a second polymer and a solvent

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