Free volume dependence of polymer viscosity

Utracki, L. A.; Sedláček, Tomáš

doi:10.1007/s00397-006-0133-z

Cited by 60 publications

(47 citation statements)

References 101 publications

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“…The liaison between viscoelastic results and volume-temperature measurements lead to gain insight on the free volume, as it is explained in the book of Ferry. [11] The development of reliable equations of state (EOS), which allow evaluating the free volume from pressure-volume-temperature (PVT) results [12][13] and the use of positron annihilation lifetime spectroscopy (PALS) as a direct way of measuring the free volume size, [14][15][16][17][18] have marked recent advances in the field.…”

Section: Introductionmentioning

confidence: 99%

A Combined Analysis of PVT and Rheological Measurements: Novel Results for Three Amorphous Polymers

Fernández¹,

Muñoz²,

Santamarı́a³

2008

Macro Chemistry & Physics

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The fractional free volume f of polycarbonate (PC), polystyrene (PS) and poly(methyl methacrylate) (PMMA) is determined by pressure–volume–temperature (PVT) measurements using the Simha–Somcynsky equation of state. Results are compared with the free volume obtained by viscoelastic measurements. Temperature and pressure dependent viscosity and free volume results are correlated using the characteristic ratio C∞ and the parameter B of the monomeric friction factor ζ = ζexp B/f. This leads to obtain new results on the temperature and pressure dependence of C∞, as well as on the pressure dependence of B parameter.magnified image

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Section: Introductionmentioning

confidence: 99%

A Combined Analysis of PVT and Rheological Measurements: Novel Results for Three Amorphous Polymers

Fernández¹,

Muñoz²,

Santamarı́a³

2008

Macro Chemistry & Physics

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“…The data and procedures were reevaluated carefully [Utracki and Sedlacek, 2007], but the plots of η versus h still did not result in superposition; for superposing the data, P * R = ξ p P * , with ξ p = 1 to 2.1, had to be used. These results imply that at lower temperatures the free-volume cells are smaller than required for segmental jumps.…”

Section: Free-volume Effects On Flowmentioning

confidence: 99%

Rheology of Polymers with Nanofillers

2010

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“…It could be studied through viscosity and PVT data relation using Simha-Somcynsky [4][5][6] or modified Miller [7] equations. Furthermore an investigation of pressure affected viscosity employing modified rheometers and followed by evaluation of flow behavior by the help of pressure coefficient using some mathematical models could be employed.…”

Section: Introductionmentioning

confidence: 99%

On Pressure Affected Shear Viscosity of Poly(Lactic) Acid

Piyamanocha¹,

Sedláček²,

Sáha³

et al. 2011

AIP Conference Proceedings

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Abstract. Evaluation of pressure coefficient of polymer melt viscosity has become important parameter taken into account for flow behavior prediction in polymer processing simulation software. In this paper, the pressure coefficient of biodegradable polymers, poly(lactic) acid (PLA), was investigated. A capillary rheometer equipped with back pressure device controlling pressure in polymer melt during flow was employed for experiments. Pressure sensitivity was evaluated through pressure coefficient calculated via fitting of obtained viscosity data by the help of Carreau-Yasuda model. It was found that pressure coefficient of PLAs is strongly affected by the internal structure of tested polymer.

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Free volume dependence of polymer viscosity

Cited by 60 publications

References 101 publications

A Combined Analysis of PVT and Rheological Measurements: Novel Results for Three Amorphous Polymers

A Combined Analysis of PVT and Rheological Measurements: Novel Results for Three Amorphous Polymers

Rheology of Polymers with Nanofillers

On Pressure Affected Shear Viscosity of Poly(Lactic) Acid

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