Determination of the parameters of lamellar structure of semicrystalline polymers using a computer program SAXSDAT

Rabiej, Stanisław; Rabiej, Małgorzata

doi:10.14314/polimery.2011.662

Cited by 25 publications

(33 citation statements)

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“…b and d). The visible maxima on the SAXS patterns corresponds to the long periodicity of the electron density inside lamellar stacks . Figure summarizes the changes of estimated long period for neat PTT and nanocomposites during heating (melting) and cooling.…”

Section: Resultsmentioning

confidence: 91%

Effect of exfoliated graphite nanoplatelets’ size on the phase structure, electrical, and barrier properties of poly(trimethylene terephthalate)-based nanocomposites

et al. 2015

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This article describes the preparation process of two series of poly(trimethylene terephthalate) (PTT) nanocomposites with an addition of exfoliated graphite nanoplatelets with two different platelets’ size (50 and 500 μm). The influence of their size on processing, physicochemical properties, morphology and, most importantly, electrical conductivity and barrier properties of thin polymer films has been studied. It was clearly found that smaller platelets enabled to obtain conductive thin polymer films with a nanoplatelet content of 0.3‐0.5 wt.%. However, nanocomposite based on PTT with 0.5 wt% of EG with the flake size of 500 μm proved to be nonconductive. At the same time smaller EG platelets demonstrated a more uniform distribution in the PTT matrix, which was confirmed by means of scanning and transmission electron microscopies, thus giving the samples in question barrier properties with respect to CO2 and O2. Moreover, it has been shown that both nanofillers did not have a significant influence on the phase transition temperatures and on the long period. They caused however a slight decrease of crystallinity which is an evidence of an antinucleating character of those nanoplatelets in the PTT matrix. POLYM. ENG. SCI., 55:2222–2230, 2015. © 2015 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 91%

Effect of exfoliated graphite nanoplatelets’ size on the phase structure, electrical, and barrier properties of poly(trimethylene terephthalate)-based nanocomposites

et al. 2015

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“…Before the main calculations could be run, the introductory data elaboration and corrections were performed using the methods described in refs. . All the calculations, including determination of the parameters of stacks from the obtained correlation function, were performed by means of the SAXSDAT computer software …”

Section: Methodsmentioning

confidence: 99%

Ethylene/POSS copolymerization behavior of postmetallocene catalysts and copolymer characteristics

Groch

Dziubek

Czaja

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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Copolymerization of ethylene with iso‐butyl substituted monoalkenyl(siloxy)‐ or monoalkenylsilsesquioxane (POSS) comonomers over bis(phenoxy‐imine) and salen‐type titanium and zirconium catalysts was studied. It was found that the polyreaction performance was significantly depended by the kind of the catalyst and by the structure and concentration of POSS in the feed. The POSS comonomer was efficiently incorporated into the polymer chain at up to 0.2 mol %. The differences in the copolymer compositions as the functions of the catalyst kind and the POSS comonomer were observed, including the varied number‐average sequence length of ethylene and unsaturated end groups, as determined by 1H NMR and FT‐IR. The presence of POSS comonomers affected also the melting and crystallization behavior of the copolymers, as evidenced by DSC, because of influence on the polymer chain arrangement. The POSS units could act as the nucleating agents. Moreover, the crystal and structural parameters of ethylene/POSS copolymers were evaluated on the basis of X‐ray results, and the limited self‐aggregation of POSS incorporated into the polymer chain, the small number and size of POSS aggregates, and the increased crystallinity degree of copolymers were demonstrated. The ethylene/POSS copolymers produced by postmetallocenes offered also high thermal stability and interesting morphological properties. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3918–3934

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“…1 :

γ ((), r) = \frac{\int_{0}^{\infty} I ((), q) \cos ((), qr) italicdq}{Q}

where q is the scattering vector ( q = 4 π sin( θ )/ λ ), and Q is the invariant defined as

Q = \int_{0}^{\infty} q 2 I ((), q) italicdq

From γ(r), the basic parameters of the lamellar stacks, to know the crystalline lamellae thickness ( l c ) and the amorphous layer thickness ( l a ), have been calculated. In this work, the calculation of γ ( r ) and the determination of the crystalline lamella thickness ( l c ), the amorphous layer thickness ( l a ), and the invariant Q were carried out using the SAXSDAT software . Modeling of the SAXS data has been completed using the Irena Package .…”

Section: Methodsmentioning

confidence: 99%

Relationships between crystalline structure and the thermal behavior of poly(ethylene 2,5‐furandicarboxylate): An in situ simultaneous SAXS‐WAXS study

Stoclet

Arias

Yeniad

et al. 2019

Polymer Engineering & Sci

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Poly(ethylene 2,5‐furandicarboxylate) (PEF) is an emerging bio‐based polymer with interesting thermal and barrier properties. In this study, the melting behavior of PEF was investigated in situ by means of simultaneous wide and small angle X‐ray scattering (WAXS and SAXS) measurements coupled with DSC measurements. This study gives the first evidence of what happens from a structural point of view during the multiple melting behavior of PEF, which is composed of three distinct events, taking into account the nature of the initial crystalline phase present. The first result is that the α′ form, induced at low crystallization temperature, does not undergo any phase transformation upon heating revealing its stable character. Second, the comparison of the SAXS and WAXS results with the DSC ones showed that the multiple melting behavior observed is attributed to a melting–recrystallization–melting process. Third, this work also definitely shows that the low amplitude melting endotherm observed in the DSC thermograms is ascribed to the melting of secondary crystals. Finally, SAXS‐WAXS results led to the conclusion that the secondary crystals cannot be depicted by the commonly accepted lamellar insertion model. Another microstructural representation of these secondary crystals is proposed. In this model, the secondary crystals consist of bundles of macromolecules, which formed small crystalline entities located between the primary crystalline lamellae stacks. POLYM. ENG. SCI., 59:1667–1677 2019. © 2019 Society of Plastics Engineers

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Determination of the parameters of lamellar structure of semicrystalline polymers using a computer program SAXSDAT

Cited by 25 publications

References 0 publications

Effect of exfoliated graphite nanoplatelets’ size on the phase structure, electrical, and barrier properties of poly(trimethylene terephthalate)-based nanocomposites

Effect of exfoliated graphite nanoplatelets’ size on the phase structure, electrical, and barrier properties of poly(trimethylene terephthalate)-based nanocomposites

Ethylene/POSS copolymerization behavior of postmetallocene catalysts and copolymer characteristics

Relationships between crystalline structure and the thermal behavior of poly(ethylene 2,5‐furandicarboxylate): An in situ simultaneous SAXS‐WAXS study

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