The Influence of Different Hematite (α-Fe2O3) Particles on the Thermal, Optical, Mechanical, and Barrier Properties of LDPE/Hematite Composites

Peršić, Ana; Popov, Nina; Krehula, Ljerka Kratofil; Krehula, Stjepko

doi:10.3390/ma16020706

Cited by 4 publications

(8 citation statements)

References 29 publications

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“…Compared to the values obtained for elongation at break in our previous work [15], it can be concluded that the highest values were obtained for the composites from the previous work in which pseudocubic particles were used in a content of 0.5 and 1%. In contrast, for the content of 0.25%, composites with all elongated particles in this work show higher values for elongation at break than the composite with pseudocubic particles in the past work (LDPE/0.25%HC2).…”

Section: Mechanical Propertiescontrasting

confidence: 61%

“…It is known that particle loading, particle size and particle/matrix interfacial strength may significantly influence the strength of the composites [29]. If the obtained results for tensile strength are compared to the results obtained in our previous work [15], it can be concluded that the highest values for tensile strength in the present work (LDPE/0.5%HP1 and LDPE/1%HP1) are slightly lower than the highest values in the past paper, which were obtained for the composites with pseudocubic hematite particles. On the other hand, the current values for tensile strength for composites with peanut-shaped hematite particles are quite similar or higher than the tensile strength values for the composites with spherical and ellipsoidal particles in the previous work.…”

Section: Mechanical Propertiesmentioning

confidence: 88%

“…To our best knowledge, except our previous study [15], there are no studies about the preparation procedures and properties of polyethylene/hematite composites and the influence of hematite on polyethylene polymer matrix. Low-density polyethylene (LDPE) is one of the most important, most produced and most used polymer materials due to its good processability and low cost.…”

Section: Introductionmentioning

confidence: 92%

“…They had narrow size distributions and well-defined shapes (pseudocubic, ellipsoidal and spherical). The obtained LDPE/hematite composites had improved thermal, optical, mechanical and barrier properties in comparison to the pure low-density polyethylene (LDPE) [15]. It was determined that all studied hematite particles improved the studied properties of LDPE/hematite composites compared to the pure LDPE.…”

Section: Introductionmentioning

confidence: 95%

“…All these characteristics enable its wide application, primarily as a food packaging material. Our previous work [15] studied the effect of the hematite particles' shape and size on the properties of LDPE. LDPE/hematite composites were prepared with three different types of synthesized hematite particles of different shape and size.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Kratofil Krehula,

Peršić,

Popov

et al. 2024

J. Compos. Sci.

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Due to the intensive search for new types of advanced polymer materials for targeted applications, this work offers insight into the properties of low-density polyethylene/hematite composites. The specific feature of this study lies in the use of elongated hematite particles of different shapes. Uniform ellipsoid-, peanut- and rod-shaped hematite particles were hydrothermally synthesized and incorporated into the polymer matrix of low-density polyethylene (LDPE). LDPE/hematite composites are prepared by melt mixing. Hematite particles are characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (PXRD). The pure LDPE polymer and LDPE/hematite composites were studied by FT-IR and UV-Vis-NIR spectroscopy and by thermogravimetric analysis (TGA). The determination of the mechanical and barrier properties was also carried out. The obtained results indicate the influence of the elongated particles on the improvement of LDPE properties. An increase in thermal stability and UV-absorption was observed as well as the improvement of mechanical and barrier properties. The improvement of the composites’ properties in comparison to the pure LDPE is especially visible in the composites prepared with low content of hematite (0.25%). LDPE/hematite composites have promising characteristics for application as packaging materials with enhanced mechanical, thermal and barrier properties as well as UV-protective materials.

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Section: Mechanical Propertiescontrasting

confidence: 61%

Section: Mechanical Propertiesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Kratofil Krehula,

Peršić,

Popov

et al. 2024

J. Compos. Sci.

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Nanocellulose‐polypropylene composites with novel antimicrobial complex salt

Zielińska,

Wyrwas,

Ławniczak

et al. 2024

Polymer Composites

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Polypropylene composites with different contents of zinc‐ammonium salts (3, 5 and 7 wt%) and nanocellulose (1 wt%) after enzymatic bioconversion were characterized by structural, dispersion‐morphological, thermal, antimicrobial and mechanical analysis. It was shown that the use of a newly synthesized salt significantly affected the formation of the supermolecular structure of the polymer matrix and increased the nucleation activity, thermostability and flexibility of the composite materials. Moreover, the addition of the inorganic filler allowed to obtain composites with very good antimicrobial properties against Staphylococcus aureus, Escherichia coli and Candida albicans. An interesting relationship between the degree of filler dispersion in the polymer matrix and the formation of polymorphic varieties was elucidated in the study, which contributes to the improvement of final performance characteristics of composite materials. It is noteworthy that a hybrid filler in the form of nanometric cellulose and a biocidal additive containing zinc‐ammonium complex salt was used for the first time. Research has shown that such polymer composites can find application during the manufacture of smart packaging materials with enhanced barrier properties against oxygen and water vapor as well as improved biocidal characteristics, which will notably extend food storage time. At the same time, the presented process of obtaining the innovative composite materials is an excellent example of sustainable technologies for the design of antimicrobial treatments, while guaranteeing the possibility of further processing of these composite materials through material recycling.Highlights Zinc‐ammonium complex with antimicrobial properties was obtained The strength properties and thermal stability of the composites were improved Degree of filler dispersion in polymer affects formation of polymorphic varieties The composites can be applied in the production of smart packaging materials

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Relevance of the Iron Distribution in Natural Smectite Clays for the Thermal Stability of PMMA–Clay Nanocomposites

Ferreira,

Santilli,

Briois

et al. 2024

ACS Omega

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Polymer−clay nanocomposites have greater thermal stability compared to the pristine polymer matrix. This can be attributed to the physical barrier provided by the inclusion of 2D clay nanoparticles (especially of the smectite group), together with radical trapping related to the distribution of specific 3d atoms in the inorganic phase. To elucidate the relevance of the Fe 3+ distribution in this synergic effect, the iron atoms present in octahedral sheets of natural nontronite clay (Non, 5.6 wt % Fe) or in maghemite (M) nanoparticles (γ-Fe 2 O 3 ) were incorporated in a poly(methyl methacrylate) (PMMA) matrix. Na-laponite (Lap) clay was used to evaluate the contribution of the diffusion barrier effect to the increased thermal stability of a PMMA-Lap nanocomposite, as evidenced by the upshift of the thermogravimetric (TGA) curve compared to that for PMMA. The contribution of radical trapping to the thermal stability of the PMMA-Non nanocomposite was evidenced by a significant shift of the Fe K-edge rising edge position by −4.5 eV after iron reduction by heating in N 2 , while similar treatment of pristine nontronite did not lead to a significant rising edge shift in the X-ray absorption spectra (XAS). This downshift demonstrated the reduction of Fe 3+ to Fe 0 , induced by the sequestration of radicals formed by PMMA depolymerization. Raman spectroscopy analysis evidenced the formation of graphitic char deposits above 400 °C, further improving the thermal stability of PMMA-Non by providing an additional physical barrier to mass transport. A fourth contribution of well-dispersed iron was the abstraction of carbon from the char by the iron carburization reaction, which hindered CO 2 formation by oxidative coking. In contrast, no relevant contribution of graphitic layer deposition was observed for the PMMA-M-Lap nanocomposite, where its improved thermal stability was only due to the combined contributions of the gas diffusion barrier effect and radical trapping by iron atoms. The maghemite effectively captured the radicals confined by the clay sheets, resulting in significant stabilization of the nanocomposite, with a shift of the mass loss of the PMMA-M-Lap nanocomposite compared to PMMA-Lap.

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The Influence of Different Hematite (α-Fe2O3) Particles on the Thermal, Optical, Mechanical, and Barrier Properties of LDPE/Hematite Composites

Cited by 4 publications

References 29 publications

Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Polymer Composites of Low-Density Polyethylene (LDPE) with Elongated Hematite (α-Fe2O3) Particles of Different Shapes

Nanocellulose‐polypropylene composites with novel antimicrobial complex salt

Relevance of the Iron Distribution in Natural Smectite Clays for the Thermal Stability of PMMA–Clay Nanocomposites

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