From elastomers to thermoplasts – Precise control of isotactic propylene structure and properties and the role of different structural elements in its mechanical behaviour

Щербина, М. А.; Meshchankina, Marina Yu.; Odarchenko, Yaroslav; Machat, Martin R.; Rieger, Bernhard; Чвалун, С. Н.

doi:10.1016/j.polymer.2017.11.038

Cited by 11 publications

(10 citation statements)

References 45 publications

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“…(quenching) of polypropylene thin films [40]. A comparative analysis of the obtained results showed that only mesophase is observed at a fiber diameter of up to 8-9 μm.…”

Section: Structural Analysismentioning

confidence: 92%

“…The X-ray patterns for composites are presented in Figure 5a and for nonwovens are shown in Figure 5b. According to X-ray data, the initial polypropylene and composites based on it are characterized by the presence of the reflections (110) at 14.1 • , (040) at 16.9 • , (130) at 18.5 • , (111) at 21.2 • , (131) + (041) at 21.9 • , (060) at 25.3 • , and (220) at 28.4 • , corresponding to a stable α-form with a monoclinic crystal lattice [9,40]. Reflections corresponding to the βor γ-form (e.g., (300) and (117), respectively) are not observed.…”

Section: Structural Analysismentioning

confidence: 99%

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Nonwoven Materials Produced by Melt Electrospinning of Polypropylene Filled with Calcium Carbonate

et al. 2020

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Nowadays, polypropylene-based nonwovens are used in many areas, from filtration to medicine. One of the methods for obtaining such materials is melt electrospinning. In some cases, it is especially interesting to produce composite fibers with a high degree of filling. In this work, the influence of the filling degree of isotactic polypropylene with calcium carbonate on the structure and properties of nonwoven materials obtained by melt electrospinning was studied. It was shown that electrospinning is possible, even at a filler content of 50%, while the average diameter of the fibers increases with the growth in the content of calcium carbonate. The addition of sodium stearate significantly reduces the diameter of the fibers (from 10–65 to 2–10 microns) due to reducing viscosity and increasing the electrical conductivity of the melt. Wide-angle X-ray diffraction analysis and IR spectroscopy reveal that the initial polymer and composites are characterized by the presence of stable α-form crystals, while nonwovens show a predominance of smectic mesophase. The addition of calcium carbonate leads to an increase in the hydrophobicity of the composite films, the addition of sodium stearate results in a decrease of hydrophobicity, while all nonwovens demonstrate superhydrophobic properties.

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“…(quenching) of polypropylene thin films [40]. A comparative analysis of the obtained results showed that only mesophase is observed at a fiber diameter of up to 8-9 μm.…”

Section: Structural Analysismentioning

confidence: 92%

Section: Structural Analysismentioning

confidence: 99%

Nonwoven Materials Produced by Melt Electrospinning of Polypropylene Filled with Calcium Carbonate

et al. 2020

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“…proved that the Young's modulus is linearly dependent on the sum of the crystalline phase content in a large set of polyethylene (PE) experiments. Shcherbina et al . obtained the dependence of the Young's modulus on crystallinity by calculating the macroscopic density of an isotactic polypropylene (iPP) sample.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Young's modulus for polypropylene: Influence of initial crystallinity and service temperature

Zhu

et al. 2019

J of Applied Polymer Sci

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In this study, the mechanical properties of isotactic polypropylene (iPP) materials with different crystallinities at room and elevated temperatures were investigated. In order to obtain samples with a certain range of crystallinity, and to ensure a uniform microstructure of these samples, the iPP samples obtained by injection molding required melt compression molding and controlled annealing. In the macromechanical studies, the experimental results showed that the storage modulus and Young's modulus of polypropylene were sensitive to the service temperature. The crystallinity also had a great influence on this relationship. A function was proposed to evaluate the dependence of the Young's modulus of polypropylene on initial crystallinity and service temperature, and tested based on experimental data. The Young's modulus of iPP is reduced by about 90% when the service temperature rises from 25 to 125 C. Moreover, the reduced value in Young's modulus between polypropylene having the highest and lowest crystallinity was reduced from 214.55 to 56.75 MPa.

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“…The dependency of mechanical properties of PP on the DoC and cooling rate was studied in refs. . These data, compared together in ref.…”

Section: Introductionmentioning

confidence: 82%

Interface strength of glass fibers in polypropylene: Dependence on the cooling rate and the degree of crystallinity

et al. 2019

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The article experimentally investigates the interface strength of glass fibers in polypropylene (PP) with two different levels of crystallinity. The different degrees of crystallinity, 46.6% and 52.5%, were achieved using fast (quenching, ~4500°C/min) and slow (~2°C/min) cooling, respectively, during production of the PP film. The degree of crystallinity was measured using the differential scanning calorimetry. The mechanical properties of the films were characterized with the dynamic mechanical analysis and with a tensile test on Deben micro‐tester. Interfacial shear strength (IFSS) of glass fiber/PP was determined using fiber fragmentation test. Interfacial normal strength (IFNS) was determined using inverse identification based on finite‐element modeling of transverse tensile loading of a single fiber (Deben micro‐tester with digital image correlation‐based observation of the debonding). The measurements have confirmed the expected trend in mechanical properties of the film: increase of the storage and Young's moduli (room temperature) with the increase of degree of crystallinity, accompanied by the decrease in the loss modulus and tan δ. Interfacial strength followed the trend of the PP stiffness: both the IFSS and IFNS values for the PP with high crystallinity (slow cooling) are three (IFSS) and four (IFNS) times higher than those for the low crystallinity (fast cooling) case.

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From elastomers to thermoplasts – Precise control of isotactic propylene structure and properties and the role of different structural elements in its mechanical behaviour

Cited by 11 publications

References 45 publications

Nonwoven Materials Produced by Melt Electrospinning of Polypropylene Filled with Calcium Carbonate

Nonwoven Materials Produced by Melt Electrospinning of Polypropylene Filled with Calcium Carbonate

Quantification of the Young's modulus for polypropylene: Influence of initial crystallinity and service temperature

Interface strength of glass fibers in polypropylene: Dependence on the cooling rate and the degree of crystallinity

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