Investigation of chain folding in polyethylene melts by diffuse neutron scattering

Schelten, J.; Stamm, Manfred

doi:10.1021/ma50004a067

Cited by 4 publications

(1 citation statement)

References 8 publications

(10 reference statements)

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“…From neutron scattering investigations on polymer melts [56][57][58][59] as well as from the description of rubbers [60][61][62] one is inevitably led to the idea of representing "global" equilibrium properties of polymer chains in the melt state by the model of an "ideal conforrnational gas" [63,64]. There are from principal reasons no global driving forces to achieve "'condensation of the chains from the conformational gas state into chain extended crystals".…”

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confidence: 99%

Microstructure and melting in fractions of polyethylene characterized with the aid of a novel folded-chain-lamella model

Holl

Heise

Kilian

1983

Colloid & Polymer Sci

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Folded-chain-lamellae are considered as "cooperative units" with frozen matter flow and with a locally heterogeneous atomistic order the degree of which is reversibly regulated by surface-meking or surface crystallization. A consequent thermodynamic treatment of restricted micro-phase equilibrium in semicrystalline fractions of polyethylene of different molecular weights can be shown to deliver a characterization of such nonequilibrium states by relating additional internal variables to parameters of the microstructure (DSC-measurements, electron-micrographs, SAXS). What appears to be very satisfactory is the conclusion that the excess situation produced by noncrystallizable defects in the semicrystalline samples is dearly related to the original state of order in the melt: Approximative invariance of penetration is directly elucidating that any matter flow in the regime of the chains of sufficient length is frozen during folded-chain crystallization. Molecular-weight effects in semicrystalline fractions of polyethylene can be interpreted on these lines.

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Section: Conclusive Remarksmentioning

confidence: 99%

Microstructure and melting in fractions of polyethylene characterized with the aid of a novel folded-chain-lamella model

Holl

Heise

Kilian

1983

Colloid & Polymer Sci

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Crystallization kinetics of 1,4‐trans‐polyisoprene, 1. Pure polymer

Chaturvedi¹

1987

Makromol. Chem.

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The crystallization kinetics of an unfractionated sample of 1,4-truns-polyisoprene was studied from its melt by means of the dilatometric method. The data are analysed according to the secondary nucleation theory. A critical discussion and comparison of previously published kinetic parameters with those derived in the present study is made. The values of the product of interfacial free energies, uu,, were found to be 5903 and 915 erg2/cm4 for the low melting and high melting polymorphs, respectively. The observed deviation from the Avrami theory towards completion of the process is interpreted to be due to the low molecular weight species of the low melting polymorph.

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Rieke

1987

Order in the Amorphous “State” of Polymers

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Investigation of chain folding in polyethylene melts by diffuse neutron scattering

Abstract: The forms of and i¡ as functions of p are from eq 3 and 4 in ref 11.

Cited by 4 publications

References 8 publications

Microstructure and melting in fractions of polyethylene characterized with the aid of a novel folded-chain-lamella model

Microstructure and melting in fractions of polyethylene characterized with the aid of a novel folded-chain-lamella model

Crystallization kinetics of 1,4‐trans‐polyisoprene, 1. Pure polymer

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