Crystallinity of polyethylene measured by density, DSC, and raman spectroscopy. A comparison

Földes, Enikő; Keresztury, Gábor; Iring, M.; Tüdős, F.

doi:10.1002/apmc.1991.051870109

Cited by 24 publications

(11 citation statements)

References 10 publications

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“…The α WAXS values are reported in Table 1, together with the crystallinity values obtained by FTIR and DSC for the sake of comparison. As above indicated, all the three methods show different values, but, in any case, the degree of crystallinity increases slightly and linearly with the clay content, as previously reported by several authors [28][29][30]. This tendency is more evident in the case of the α WAXS values.…”

Section: Waxssupporting

confidence: 75%

Nanostructural characterization of poly (vinylidene fluoride)-clay nanocomposites prepared by a one-step reactive extrusion process

Benabid¹,

Rong²,

Benachour³

et al. 2014

Journal of Polymer Engineering

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Poly (vinylidene fluoride) (PVDF)-untreated clay nanocomposites were successfully prepared using an innovative one-step reactive melt extrusion process. Through specific temperature and shear conditions, the chemical reactions took place between the polymer matrix, the inorganic clay particles, and three main reactive agents: an organic peroxide, sulfur, and a specific activator led finally to the PVDF-clay nanocomposites. The materials were formulated with various amounts of clay in order to identify the best conditions, enabling to obtain the optimal particle exfoliation in the polymer matrix at the nanometric scale. The microstructure and nanostructure modifications were characterized by Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and wide-and small-angle X-ray scattering (WAXS and SAXS). The relationship between nanostructure and mechanical behavior was investigated by tensile experiments, impact tests, and microhardness measurements. The FTIR results suggest that there is a chemical interaction between the clay and the polymer. Furthermore, the WAXS study shows that no intercalation step takes place in any composition. In addition to this, the sample with 2.5 wt.% clay could present a total exfoliation of the clay particles. The PVDF matrix is found to be exclusively of the α-form in all compositions. The final microhardness slightly increases with both nanoclay content and degree of crystallinity.

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Section: Waxssupporting

confidence: 75%

Nanostructural characterization of poly (vinylidene fluoride)-clay nanocomposites prepared by a one-step reactive extrusion process

Benabid¹,

Rong²,

Benachour³

et al. 2014

Journal of Polymer Engineering

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“…At slow cooling the increase of the crystallinity and the lamellar thickness of PE can be accompanied with density increase 25) , while the recrystallization occurring under the melting range does not cause necessarily the changes of the density. Films of about 100 lm processed from LDPE and the blend of 70 wt.-% LDPE + 30 wt.-% LMDPE (ethylene-1-hexene copolymer; 6.5 CH 3 /1000C) annealed at 50 8C and 70 8C reveal similar densities before and after annealing (Fig.…”

Section: Additive Compositionmentioning

confidence: 99%

Study of the effects influencing additive migration in polymers

Földes

1998

Angew. Makromol. Chem.

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“…Literature also suggests that the melting temperatures are affected by development of the crystal structures. [46,49]…”

Section: Thermal Propertiesmentioning

confidence: 99%

Self‐assembled fibrillar polyethylene crystals with tunable properties

Seyhan

Günaydın

Polat

et al. 2020

Polymer Engineering & Sci

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Due to its simple linear chain structure, crystal morphology of linear low‐density polyethylene (LLDPE) fibers can be controlled to fulfill the needs of diverse advanced applications. This study presents a simple two‐step method to produce LLDPE fibers with self‐assembled fibrillar crystals and highly oriented amorphous phase. Rather than conventional melt spinning, fibers were treated in a two‐step eco‐friendly bath without drawing after extruded fibers emerge from the spinneret. Treated fibers through the baths demonstrated lower crystallinity, but significantly higher degree of crystal orientation when compared to control fibers of traditional melt spinning. Morphological analysis revealed that a unique microstructure was formed after spinning through a two‐step eco‐friendly bath. As‐spun fibers demonstrated spherulitic morphology which can be transformed into a fibrillar structure followed by post‐drawing process. Cross sectional images of the treated LLDPE fibers produced at 400 m/min showed fibrillar PE crystals which can be more dominant upon post‐drawing. After two‐step bath treatment, produced fibers need low draw ratios to exhibit high performance. Our novel modification followed by hot drawing process can manipulate internal structure with performance of PE fibers to an outstanding level of 0.35 GPa strength and 3 GPa modulus at a production speed of 400 m/min.

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Crystallinity of polyethylene measured by density, DSC, and raman spectroscopy. A comparison

Cited by 24 publications

References 10 publications

Nanostructural characterization of poly (vinylidene fluoride)-clay nanocomposites prepared by a one-step reactive extrusion process

Nanostructural characterization of poly (vinylidene fluoride)-clay nanocomposites prepared by a one-step reactive extrusion process

Study of the effects influencing additive migration in polymers

Self‐assembled fibrillar polyethylene crystals with tunable properties

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