Roughness of growth faces of polymer crystals: Evidence from morphology and implications for growth mechanisms and types of folding

Sadler, D. M.

doi:10.1016/0032-3861(83)90220-3

Cited by 140 publications

(87 citation statements)

References 45 publications

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“…[16][17][18][19][20] Furthermore, there is the so-called ''␦l catastrophe:'' at too large supercoolings the predicted thickness goes to infinity unless a parameter in a͒ Present address: University Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, UK; electronic mail: jon@clust.ch.cam.ac.uk the model, the apportionment factor ⌿, is rather arbitrarily set to zero. 7 In the entropic barrier approach it is not clear whether approximations such as the implicit representation of the chain connectivity and chain folds by a set of simple growth rules and neglect of the energetic contribution of chain folds to the free energy of the fold surface compromise its conclusions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Monte Carlo simulations of the growth of polymer crystals

Doye

Frenkel

1999

The Journal of Chemical Physics

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Based upon kinetic Monte Carlo simulations of crystallization in a simple polymer model we present a new picture of the mechanism by which the thickness of lamellar polymer crystals is constrained to a value close to the minimum thermodynamically stable thickness, l min . The free energetic costs of the polymer extending beyond the edges of the previous crystalline layer and of a stem being shorter than l min provide upper and lower constraints on the length of stems in a new layer. Their combined effect is to cause the crystal thickness to converge dynamically to a value close to l min where growth with constant thickness then occurs. This description contrasts with those given by the two dominant theoretical approaches. However, at small supercoolings the rounding of the crystal profile does inhibit growth as suggested in Sadler and Gilmer's entropic barrier model.

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Section: Introductionmentioning

confidence: 99%

Kinetic Monte Carlo simulations of the growth of polymer crystals

Doye

Frenkel

1999

The Journal of Chemical Physics

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“…Crystallization under such conditions has been shown to produce rounded faces in polytals are evident; (2) the individual crystals within the aggregates are comparatively small and are meric and also low molecular weight systems. 7,8 However, under usual conditions such as are releirregular and needle-like in appearance; (3) the crystals lie with common orientation, in turn, imvant here, growth occurs through secondary nu- cleation and ''spreading.'' Rates of nucleation can In poly(aliphatics), interchain forces are only van der Waals in nature; in contrast, in poly(amides) be treated in terms of relative rates of attachment crystallization is dominated by the formation of and detachment of stems on a ''clean'' face, such hydrogen bonds between the N{H and C|O of that the net rate of nucleation is dependent upon amide groups on adjacent stems.…”

Section: Comparison Of Morphologymentioning

confidence: 97%

The effect of highly specific lattice hydrogen bonding on morphologies of solution-grown crystals

Waddon

1997

J. Polym. Sci. B Polym. Phys.

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“…Therefore, an entropy part was added to the traditional "nucleation barrier." In 1983, Sadler and Gilmer [105] took this idea to extremes and argued that the nucleation barrier is completely an "entropy barrier" without enthalpic contribution. Meanwhile, they proposed that the regime transition from I to II corresponded to the transition from rough surface nucleation to smooth surface nucleation [85,105,106].…”

Section: The Sadler-gilmer Modelmentioning

confidence: 99%

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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Roughness of growth faces of polymer crystals: Evidence from morphology and implications for growth mechanisms and types of folding

Cited by 140 publications

References 45 publications

Kinetic Monte Carlo simulations of the growth of polymer crystals

Kinetic Monte Carlo simulations of the growth of polymer crystals

The effect of highly specific lattice hydrogen bonding on morphologies of solution-grown crystals

A Review on Polymer Crystallization Theories

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