A review of the experimental data from the high pressure phase in polyethylene

Leute, U.; Dollhopf, W.

doi:10.1007/bf01480823

Cited by 35 publications

(21 citation statements)

References 28 publications

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“…Estimates of the respective terms involved in Equation (17) are made as follows. As for the enthalpy changes at melting and transition temperatures, thermodynamic data reported early by Leute and Dollhopf [17] In his recent review on the role of the hexagonal phase in the crystallization of PE, Bassett [18] …”

Section: Comparison With Experimentsmentioning

confidence: 99%

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Hirami

2010

Macro Theory & Simulations

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For polymer systems of two crystalline phases of one polymer component, each phase being consisted of polymer crystals of a finite size, we derive the crystalline‐crystalline phase transition relationship, i.e., generalized Gibbs‐Thomson equation. Its application combined with the crystalline‐liquid transition relationship (usual Gibbs‐Thomson equation) to the phase behavior of PT phase diagram of polyethylene (PE) is investigated, where the orthorhombic‐hexagonal phase transition of PE crystal under high pressure being involved. Comparison with experimental data leads to the estimates of the structural characteristics such as the ratios of (the end surface free energy of polymer crystal/crystal length) for the respective crystalline phases.magnified image

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Section: Comparison With Experimentsmentioning

confidence: 99%

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Hirami

2010

Macro Theory & Simulations

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“…This fact strongly indicates that the molecules jump out from the layer surface by the thermal motion. High pressure phase diagrams420 have been established for n-alkanes [14,15,[17][18][19][20][21][22] and polymers [23][24][25]. Josefiak et al performe DT A measurements under pressure for some nalkanes in the range C27 to C38 [14].…”

Section: Ritimentioning

confidence: 99%

Thermal and X-ray measurements on n-hexatriacontane (C₃₆H₇₄)

Mina

Asano²,

Mondieig³

et al. 2004

J. Phys. IV France

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Abstract. The polymorphism of n-hexatriacontane (C3JI74) was investigated by X-ray diffraction and DSC thermal analysis. C3JI74 displays at least two stable monoclinic phases and a rotator phase. Starting from a solution-grown sample of very high purity the following phases are observed with increasing temperature : MOI 1 < 345K < M101 < 346K < RIII < 348K < liquid. Depending on the thermal treatment also other forms may be observed. During these transitions, both the crystalline volume and the lamellar thickness increase. The higher order reflections of the layer structure was precisely measured by X-ray diffraction. Using a Fourier synthesis, electron density profiles of the three phases were analysed. The results show that the interlamellar structure is disturbed by increasing molecular motions with elevating températures. For some homologous alkanes also p (T) phase diagrams and binary systems have been studied.

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“…In this series one of our aims is to provide -besides accurate p VT-data -information about the influence of pressure on phase transitions. The first five papers dealt with PE [1,3,4], PEO [1], PP [1,2], poly(trans-l,4-butadiene) [5] and n-alkanes [4]. Now we have chosen poly(1-butene), (-CH2-CHC2Hs-),, subsequently called simply polybutene, as the topic of the present study for the two following reasons.…”

Section: Introductionmentioning

confidence: 98%

High pressure dilatometry on polybutene-1

Leute

Dollhopf

1983

Colloid & Polymer Sci

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High pressure dilatometry is used to study the melting processes and the melt of isotactic polybutene-1. Evaluating a great number of isobaric V(T)-curves determined in the range of a few hundred bar the pressure dependence of the melting temperature is accurately determined for modifications I and II.Extrapolation to 1 bar yields dTJdp = 43.6 K/kbar and a heat of fusion AHm=8.0 kJ/ mol for modification I. The values for modification II are 21.4 and 6.9 resp. Up to 4.25 kbar data of melting temperature, volume, entropy and enthalpy as a function of pressure are reported and also the compressibility of the melt. Finally the relative thermodynamic stability of the different modifications is discussed.

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A review of the experimental data from the high pressure phase in polyethylene

Abstract: M8423*

Cited by 35 publications

References 28 publications

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Thermal and X-ray measurements on n-hexatriacontane (C₃₆H₇₄)

High pressure dilatometry on polybutene-1

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A review of the experimental data from the high pressure phase in polyethylene

Abstract: M8423*

Cited by 35 publications

References 28 publications

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Crystalline/Crystalline Phase Transitions in Polymer Systems Consisting of Finite‐Size Crystals in Each Crystalline Phase: Generalized Gibbs‐Thomson Equation

Thermal and X-ray measurements on n-hexatriacontane (C36H74)

High pressure dilatometry on polybutene-1

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Thermal and X-ray measurements on n-hexatriacontane (C₃₆H₇₄)