Specific volume of polymers as a function of temperature and pressure

Heydemann, Peter L. M.; Guicking, H. D.

doi:10.1007/bf01500062

Cited by 133 publications

(24 citation statements)

References 12 publications

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“…In the region of the ),-relaxation ~ increases to 2.05.10-4K -1. A similar behaviour was reported by Heydemann and Quicking [26]. They found, however, a transition temperature near -7 °C at a cooling rate of 25 K/h and an increase in c~ from 1.4" 10 .4 K -1 to 2.1 • 10 .4 K -1.…”

Section: Specific Volume Versus Temperature Curves At Constant Rate Osupporting

confidence: 83%

Thermal contraction and volume relaxation of amorphous polymers

1984

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Abstract." Two experimental techniques are described for the determination of the change of specific volume of polymers with temperature and aging time, which allow measurements between -160 °C and + 200 °C. Four technical amorphous polymers, PS, PVC, PMMA and PC have been investigated. Volume-temperature curves under constant rate of cooling are presented and interpreted with respect to relaxation processes known from other physical investigations. The rate dependence of dilatometric glass transition temperatures is compared with the time dependence of rheometric glass transition temperatures from shear creep data. Volume relaxation data at constant aging temperature are presented. Aging is found to proceed until very low temperatures in the glassy state for e.g. PMMA.For polystyrene, a comparison is made between the predictions of a very simple theory of volume relaxation due to Kovacs with experimental data, using additional information from volume temperature curves and the time temperature shift of the shear creep transition. The theory predicts a rate of volume relaxation which is much lower than that found by experiment.

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Section: Specific Volume Versus Temperature Curves At Constant Rate Osupporting

confidence: 83%

Thermal contraction and volume relaxation of amorphous polymers

1984

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“…The density and the thermal pressure coefficient are less important quantities and were taken from ref. 33. As can be seen from …”

Section: "= T/t* = (Tp~ 7"ip* + (~2 7"2p'~)/p* (6)mentioning

confidence: 82%

Influence of the tacticity of poly(methyl methacrylate) on the miscibility with poly(vinyl chloride)

Vorenkamp

Brinke²,

Meijer

et al. 1985

Polymer

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“…The knowledge of the specific volume as a function of pressure (and temperature) then enables us to calculate the refractive index of PMMA as a function of pressure with Eq. (16). Fig.…”

Section: Pmma Filmsmentioning

confidence: 92%

“…Since the density of bulk PMMA is well known as a function of pressure 16,17,[25][26][27][28] , we started our experiments with thick films (d L 2.5 lm) assuming that these films behave like bulk material. Therefore, the theoretical approach derived in Eq.…”

Section: Pmma Filmsmentioning

confidence: 99%

Pressure dependence of thickness and refractive index of thin PMMA-films investigated by surface plasmon and optical waveguide spectroscopy

Kleideiter¹,

Lechner²,

Knoll³

1999

Macromol. Chem. Phys.

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SUMMARY: Total internal reflection (TIR) and attenuated total reflection (ATR) measurements in the Kretschmann configuration have been performed at 25 8C with poly(methyl methacrylate) (PMMA) films (of ca. 2.5 lm thickness) spincoated on top of a 50 nm thick gold layer, as a function of the applied hydrostatic pressure, ranging from p = 1 N 10 5 to 1 050 N 10 5 Pa. The analysis of guided optical modes allows for the separate determination of the refractive index n and the thickness d of the polymer films as a function of pressure. The pressure media in contact with the PMMA films were water, ethanol, and methanol. Thermodynamic theories for the density of solids and fluids in combination with the Lorentz-Lorenz equation for their optical properties fit the experimental data quite well.

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Specific volume of polymers as a function of temperature and pressure

Cited by 133 publications

References 12 publications

Thermal contraction and volume relaxation of amorphous polymers

Thermal contraction and volume relaxation of amorphous polymers

Influence of the tacticity of poly(methyl methacrylate) on the miscibility with poly(vinyl chloride)

Pressure dependence of thickness and refractive index of thin PMMA-films investigated by surface plasmon and optical waveguide spectroscopy

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