Effect of pressure on the crystallization of poly(ethylene terephthalate)

Ihm, Dae Woo; Cuculo, John A.

doi:10.1002/pol.1982.170200717

Cited by 5 publications

(3 citation statements)

References 52 publications

(12 reference statements)

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“…As may be observed, the volume deformation k is larger the higher the pressure and the lower the temperature. There are two plateau regions [5] (see also figures 4 and 5) in which the behavior seems to be viscoelastic (one at high temperature and low pressure corresponding to pure melt behavior, and another at low temperatures, high pressures, and long times, corresponding to pseudoequilibrium crystalline solid state) separated by a change of slope zone in which the isothermal rise of the pressure of the melt has as direct effect a rise in the melting temperature of th'e polymer T m to a new value T" such as the Tex v < T,~ and, therefore, crystallization from the melt begins [5,8].…”

Section: Resultsmentioning

confidence: 99%

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Compression creep of molten poly (butylene terephthalate)

Sanchez-Sancha¹,

Alemán²

1988

Rheol Acta

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Viscoelastic parameters of poly(butylene terephthalate) melt in compression creep have been measured in an Instron Capillary Rheometer. Bulk compression creep compliance B(t) shows plateau regions in the molten state and in the melt crystallized state, both decreasing with increasing stress. Shifting of B(t) curves provides master curves suitable for analyzing the total (superposed elastic and viscous) bulk compression behavior.Volume viscosity decreases with both increasing stresses and compression rates but seems to be independent of temperature. Its values are larger than those from constant compression rate experiments, possibly due to the presence of elastic effects.

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Section: Resultsmentioning

confidence: 99%

“…The experimental procedure was tested with poly(ethylene terephthalate) data published elsewhere [5,8]. Results are shown in figure 1 at 541 K and 69.16 MPa.…”

Section: Ve Tt = N R 2 (L T --[)mentioning

confidence: 99%

Compression creep of molten poly (butylene terephthalate)

Sanchez-Sancha¹,

Alemán²

1988

Rheol Acta

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“…Furthermore, from a thermodynamic point of view, parameter b can also be evaluated using the Clapeyron equation16: where Δ V = V a − V c is the specific volume difference between the liquid and the pure crystalline phases and Δ H f is the heat of fusion per unit mass.…”

Section: Resultsmentioning

confidence: 99%

Effect of the pressure on the crystallization behavior of polyamide 66

Won¹,

Fulchiron²,

Douillard³

et al. 2001

J of Applied Polymer Sci

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ABSTRACT:The crystallization behavior of polyamide 66 under high pressure up to 2500 bar was investigated by the use of dilatometric and calorimetric techniques in nonisothermal and isothermal conditions. The solid-solid Brill transition is detected from the evolution of the specific volume in the PVT diagram. The variation of supercooling was examined under different pressures and temperatures. In nonisothermal conditions, when the same cooling rate is applied, the crystallization supercooling is not changed for different pressures. In isothermal conditions, for a given temperature, a pressure increase extends the crystallization supercooling. By the analysis of melting peaks of samples crystallized in different conditions of pressure and temperature, we can conclude that the increasing of the crystallization supercooling leads to a decrease of the lamellae thickness. Finally, the evolution of the thermodynamic equilibrium melting temperature according to pressure was examined.

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Effects of pressure on the compressibility and crystallization of fiber‐forming polymers

Wei

Cuculo

Ihm

1983

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

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The effects of pressure on the compressibility and crystallization of three fiber‐forming polymers, poly(tetramethylene terephthalate), nylon 66, and Qiana® nylon, have been studied. The Instron capillary rheometer was adapted as a high‐pressure dilatometer for all the high‐pressure experiments. The compressibility results reaffirmed that polymers are highly compressible, and their compressibilities are nonlinear at temperatures above the glass transition temperatures. Polymer melts show higher compressibility than do polymers in the solid state. The kinetics of crystallization of these polymer melts under high pressures were studied. Analysis of the data revealed low Avrami exponents at high pressures. It seems that the kinetics of crystallization of these polymers from the melt under high pressure are different from those at normal pressure. Crystallization temperatures of these polymers were also measured. The crystallization temperatures are considerably higher at higher pressures.

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Effect of pressure on the crystallization of poly(ethylene terephthalate)

Cited by 5 publications

References 52 publications

Compression creep of molten poly (butylene terephthalate)

Compression creep of molten poly (butylene terephthalate)

Effect of the pressure on the crystallization behavior of polyamide 66

Effects of pressure on the compressibility and crystallization of fiber‐forming polymers

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