Characterization of the dual crystal population in an isothermally crystallized homogeneous ethylene-1-octene copolymer

Rabiej, Stanisław; Goderis, Bart; Janicki, J.; Mathot, Vincent; Koch, Marta; Groeninckx, Gabriël; Reynaers, Harry; Gelan, Jan; Włochowicz, A.

doi:10.1016/j.polymer.2004.10.045

Cited by 26 publications

(33 citation statements)

References 60 publications

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“…An attempt to confirm the claims of Strobl and coworkers, 13,15 by a repetition of their direct measurement of the crystal thicknesses across the melting temperature range of similar copolymers by dynamic SAXS measurements, was reported by Rabiej et al 68 These workers determined the crystal thickness as a function of temperature across the melting endotherm of poly(ethylene-1-octene) [5.2 mol % 1-octene] with narrow CCD (the melting endotherm of this copolymer was similar to that shown in Fig. 2).…”

Section: Resultsmentioning

confidence: 65%

“…The increase in crystal thickness of the data of Rabiej et al in the range >377 K was attributed to melting, recrystallization, and remelting (mrr). 68 However, a difficulty in evaluating these results was that no precision statement was given for the SAXS crys- tal thickness data, either in the paper 68 or in the supporting doctoral thesis work. 69 The error bars on the data of Rabiej et al in Figure 9 were added, assuming that the SAXS data had a minimal precision error of 65% (relative).…”

Section: Resultsmentioning

confidence: 99%

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Crystallization and melting of polyethylene copolymers: Differential scanning calorimetry and atomic force microscopy studies

Mirabella

2006

J Polym Sci B Polym Phys

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ABSTRACT:The HoffmanLauritzen theory of secondary, surface nucleation and growth was primarily relied upon for about 40 years after its introduction in about 1960 to rationalize the crystallization of flexible chain polymers into lamellar crystals. However, in about 1998, Strobl and coworkers introduced a different model for crystallization, based on the stagewise formation of lamellae. Two major components of this model were as follows: (1) the concept of the formation of a mesomorphic melt as a precursor to crystallization and (2) the control of the melting temperature range of lamellar crystals of homogeneous polyolefin copolymers by an inner degree of order or perfection rather than on the crystal thickness. The first concept is in disagreement with the HL theory and the second with the Gibbs-Thomson theory, which associates melting temperature with lamella thickness. In the present study, differential scanning calorimetry and atomic force microscopy were successfully employed to monitor the in situ quiescent crystallization of polyethylene homopolymer and copolymer. In the present study, evidence was not found to support the concept of lamellae with equal thickness melting over a broad temperature range. Some evidence was found that might be interpreted to support the concept of a mesomorphic melt as a precursor to crystallization. At present, the model promoted by Strobl and coworkers appears to be at an uncertain stage at which strong proof or disproof are not available. However, this alternative model has injected a new vitality into the study of crystallization of flexible chain polymers.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Crystallization and melting of polyethylene copolymers: Differential scanning calorimetry and atomic force microscopy studies

Mirabella

2006

J Polym Sci B Polym Phys

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“…From a critical perspective, there does not seem to be any piece or pieces of evidence that could not be explained either by water absorption and/or slow crystallization of ethylene segments. Further, this same peak at $508C that grows with room temperature annealing occurs in both unneutralized acid copolymers [112] as well as other ethylene copolymers, [113][114][115], although the effect is not nearly as dramatic. The best way to prove that such a transition exists is to choose a system that cannot crystallize, and rigorously exclude water to eliminate these two possible explanations.…”

Section: Ionomer Synthesismentioning

confidence: 89%

Review and critical analysis of the morphology of random ionomers across many length scales

Grady

2008

Polymer Engineering & Sci

101

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This review presents a description of what is known about ionomer morphology. All papers on ionomer morphology are not included in this review; but all relevant questions about ionomer morphology are posed and answered as completely as possible. The review is critical; that is, reasons are given for morphologies that are deemed to be more or less likely. The review is organized along three length scales: sub-nanometer, nanometer to 10 nm, and greater than 10 nm. Within each length scale, all three phases are considered: crystalline, amorphous, and ionic aggregate. The purity of the three phases, the arrangement of atoms in the three phases, the size and shape of the three phases, and their arrangements in space relative to each other are explored in this review. A model for the shape of aggregates in ionomers that have well-ordered internal environments is presented. This model proposes that aggregates are fundamentally planar, but will ''roll up'' into tubes or other related structures in order to reduce the number of atoms at aggregate edges. This model was developed primarily based on the varied morphologies ionomers have shown in electron micrographs, but is consistent with other indirect measurements of ionomer morphology.

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“…Rabiej [3] investigated the crystal morphology during isothermal process and found dual crystal population. Androsch et al [4−7] investigated the reversibility of crystallization and melting behavior during non-isothermal process and the effect of annealing on crystallization.…”

Section: Introductionmentioning

confidence: 99%

Morphology and mechanical properties of poly(ethyleneoctene) copolymers obtained by dynamic packing injection molding

et al. 2012

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The morphology and mechanical properties of poly(ethylene-octene) copolymers (POE) obtained by dynamic packing injection molding were investigated by mechanical tests, differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The mechanical tests found that only POE with low octene content and high molecular weight show apparent response for external shear field. Further investigation has been done by DSC, FT-IR, and SEM in order to make clear the reason of that phenomenon. Finally, the hypothetical mechanism of POE microstructure formation under shear field has been proposed. For POE with low octene content and high molecular weight, orientation degree and mechanical properties both increase substantially under shear field. For POE with low octene content and low molecular weight, orientation degree and crystallinity increase under shear field, but it is not dramatically benefit for the mechanical properties. For POE with high octene content and high molecular weight, the shear field has little effect on the morphology and mechanical properties.

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Characterization of the dual crystal population in an isothermally crystallized homogeneous ethylene-1-octene copolymer

Cited by 26 publications

References 60 publications

Crystallization and melting of polyethylene copolymers: Differential scanning calorimetry and atomic force microscopy studies

Crystallization and melting of polyethylene copolymers: Differential scanning calorimetry and atomic force microscopy studies

Review and critical analysis of the morphology of random ionomers across many length scales

Morphology and mechanical properties of poly(ethyleneoctene) copolymers obtained by dynamic packing injection molding

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