Small-angle neutron scattering by semicrystalline polyethylene

Yoon, D. Y.; Flory, Paul J.

doi:10.1016/0032-3861(77)90170-7

Cited by 151 publications

(75 citation statements)

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“…This conclusion was corroborated by more extensive experimental results of Salder & Keller (1977). King et al (1978) reached a similar conclusion from their experimental results in the region #<0"04 AHowever, as demonstrated previously (Yoon & Flory, 1977), the scattering functions in the region 0-03 < # < 0" l/~ -1 where the distances of 30-100 ~ are decisive, are extremely sensitive to the tendency for occurrence of adjacent re-entry. Thus, analysis of experimental data in this lower range of scattering angles, where the interference between crystalline sequences plays a dominant role, is critical in distinguishing various morphologies of re-entry.…”

Section: Introductionsupporting

confidence: 68%

“…The procedure described previously (Yoon & Flory, 1977) was employed for the generation of Monte-Carlo chains according to the conformational statistics of polyethylene chains both in the amorphous polymer and the trans conformation in the crystalline state, and computations of scattering functions F,(/I) according to equation (2). …”

Section: Theory and Computational Proceduresmentioning

confidence: 99%

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Small-angle neutron scattering functions from semicrystalline polymers

Yoon¹

1978

J Appl Cryst

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Section: Introductionsupporting

confidence: 68%

Section: Theory and Computational Proceduresmentioning

confidence: 99%

Small-angle neutron scattering functions from semicrystalline polymers

Yoon¹

1978

J Appl Cryst

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“…According to this model the amorphous layer is constituted of sharp folds. A proportion of 30 % of sharp fold among loose folds is necessary for explaining the experimental neutron scattering results [9]. In melt crystallized materials there is significant evidence that the radius of gyration of the coil in the melt is not quite different to that of the chain in the crystal.…”

mentioning

confidence: 98%

“…It is well known that melt and solution grown crystals present great differences with regard to the crystallinity x and the topology of folds [2,6,9]. In monocrystals grown from solution there is a great deal of evidence that there is some regularity of the Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphys:0198000410120145900 folds [1,2,7], and a model of superfolding has been proposed [6].…”

mentioning

confidence: 99%

Crystallization of polymers. Part I : Polydispersed polymers quenched from the liquid state

et al. 1980

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Résumé. 2014 Nous avons mesuré les longues périodes de plusieurs polymères trempés à partir de l'état fondu. Nous donnons la relation entre la longue période mesurée dans la phase semi-cristalline et la rigidité de la chaîne dans l'état liquide juste avant la cristallisation. On montre que la mesure des longues périodes d'échantillons préala-blement recuits à l'état fondu, à différentes températures, et pendant des temps différents, nous permet de remonter à un temps de relaxation des pelottes dans le fondu.Abstract. 2014 The long spacing L of several crystalline polydispersed polymers quenched from the liquid state at various temperatures has been measured. We correlate the variations of the long period L with the variations of the dimension r0 > of the ideal coils in the melt just before the crystallization. The relationship between L and the rigidity C of the liquid chain is given. The annealing of the melt at different temperatures and for different times, and the subsequent crystallization allow us to measure the relaxation time of the coils in the liquid state.

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“…Various kinetic factors may be mutually cancelled, leading to similar experimental relations [42]. In addition, crystals obtained from melt usually present high mechanical strength and toughness; therefore, various lamellar crystals must be connected by tie molecules.…”

Section: Melt-grown Polymer Crystalsmentioning

confidence: 91%

A Review on Polymer Crystallization Theories

2016

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Abstract:It is the aim of this article to review the major theories of polymer crystallization since up to now we still have not completely comprehended the underlying mechanism in a unified framework. A lack of paradigm is an indicator of immaturity of the field itself; thus, the fundamental issue of polymer crystallization remains unsolved. This paper provides an understanding of the basic hypothesis, as well as relevant physical implications and consequences of each theory without too much bias. We try to present the essential aspects of the major theories, and intuitive physical arguments over rigorously mathematical calculations are highlighted. In addition, a detailed comparison of various theories will be made in a logical and self-contained fashion. Our personal view of the existing theories is presented as well, aiming to inspire further open discussions. We expect that new theories based on the framework of kinetics with direct consideration of long-range multi-body correlation will help solve the remaining problems in the field of polymer crystallization.

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Small-angle neutron scattering by semicrystalline polyethylene

Cited by 151 publications

References 10 publications

Small-angle neutron scattering functions from semicrystalline polymers

Small-angle neutron scattering functions from semicrystalline polymers

Crystallization of polymers. Part I : Polydispersed polymers quenched from the liquid state

A Review on Polymer Crystallization Theories

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