The Friction of Structurally Modified Isotactic Polypropylene

Wierzbicka, Natalia; Sterzyński, Tomasz; Nowicki, Marek

doi:10.3390/ma14237462

Cited by 4 publications

(5 citation statements)

References 60 publications

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“…Polarized optical microscopic observation showed a significant influence of the spherulite size of iPP after treatment (Figure b). When PP-treated with higher temperatures (OPP125), the crystal size of the treated sample became slightly smaller because of cooling-induced crystallization after heat treatment . However, only a few crystals can be observed in OPP150.…”

Section: Resultsmentioning

confidence: 99%

“…When PP-treated with higher temperatures (OPP125), the crystal size of the treated sample became slightly smaller because of cooling-induced crystallization after heat treatment. 55 However, only a few crystals can be observed in OPP150. It is well-known that whether or not a polymer can crystallize depends on its molecular structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Polypropylene Nanoplastics Via Thermal Oxidation Reaction for Human Cells Responsiveness Studies

Hiranphinyophat,

Hiraoka,

Kobayashi

et al. 2023

Langmuir

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With the current worldwide increasing use of plastics year by year, nanoplastics (NPs) have become a global threat to environmental and public health concerns. Among plastics, polypropylene (PP) is widely used in industrial and medical applications. Owing to the lack of validated detection methods and standard materials for PP NPs, understanding the impact of PP NPs on the environmental and biological systems is still limited. Here, isotactic polypropylene (iPP) was fabricated into oxidized polypropylene micro/nanoplastics (OPPs) via a thermal oxidation using hydrogen peroxide (H 2 O 2 ) under various heating temperatures. The resulting OPPs were investigated in terms of the size distribution, surface chemistry, morphology, and thermal property as well as their concentration-dependent cytotoxicity to a human intestinal epithelial cell line (Caco-2), which could be a route to uptake NPs into the body through the food chain. The average diameters of the OPPs decrease with increasing reaction temperature. The OPPs obtained at 175 °C (OPP175) were spherical in shape and had a rough surface, with size distributions of approximately 0.14 ± 0.02 μm. A significant increase in the carbonyl content of the oxidized product was confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy analyses. Caco-2 cells were exposed to OPP175 in a dose-dependent manner, and a significant loss of cell viability occurred at the concentration of 100 μg/mL. Thus, this study provides a fundamental approach for the fabrication of a model of NPs for the urgently demanded in vitro and in vivo studies to assess the potential impact of NPs on biological systems.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Fabrication of Polypropylene Nanoplastics Via Thermal Oxidation Reaction for Human Cells Responsiveness Studies

Hiranphinyophat,

Hiraoka,

Kobayashi

et al. 2023

Langmuir

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“…It was found that the aging time of PP-Rβ, which has a better fatigue crack expansion resistance, was 30% higher than that of PP-Rα [ 15 ]. Moreover, the effect of β-crystals on the friction coefficient [ 16 ] is less than that of α-crystals.…”

Section: Introductionmentioning

confidence: 99%

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

Xiulin

et al. 2023

Polymers

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The β-crystals of polypropylene have a metastable crystal form. The formation of β-crystals can improve the toughness and heat resistance of a material. The introduction of a β-nucleating agent, over many other methods, is undoubtedly the most reliable method through which to obtain β-PP. Furthermore, in this study, certain newly developed β-nucleating agents and their compounds in recent years are listed in detail, including the less-mentioned polymer β-nucleating agents and their nucleation characteristics. In addition, the various influencing factors of β-nucleation efficiency, including the polymer matrix and processing conditions, are analyzed in detail and the corresponding improvement measures are summarized. Finally, the composites and synergistic toughening effects are discussed, and three potential future research directions are speculated upon based on previous research.

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“…Recent studies have focused on various aspects of the sliding surface, including tribological investigations of different polymers and the role of mating surfaces [1]. Additionally, the literature provides results of coefficient of friction (COF) measurements for various polymers employed as plain bearings [2,3]. Enhancing tribological parameters and mechanical properties remains a popular research topic.…”

Section: Introductionmentioning

confidence: 99%

Influence of Inorganic Additives on the Surface Characteristics, Hardness, Friction and Wear Behavior of Polyethylene Matrix Composites

Wierzbicka,

Talar,

Grochalski

et al. 2023

Materials

Self Cite

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The aim of this research was to analyze the effect of inorganic additives on the tribological properties of the high-density polyethylene (HDPE) matrix composite surface. Titanium (Ti) and hexagonal boron nitride (hBN) were added in different mass fractions. The samples were produced by pressing a pre-prepared mixture of granules. The composite samples with the following mass fractions of additives were fabricated: 5% hBN, 10% hBN, 28% Ti–2% hBN, 23% Ti–7% hBN, and 20% Ti–10% hBN. An even distribution of individual additives’ concentrations was confirmed. Observations of morphology, surface topography, hardness, and tribological measurements were conducted using reciprocating motion tests with the “pin-on-flat” and rotational tests with the “pin-on-disc” configuration. Subsequently, microscopic observations and measurements of the wear track profile were carried out. Additionally, geometry parameters of the contacting elastic body were calculated for various counter-samples. It was found that the Shore D hardness of samples containing Ti and hBN increased with the Ti content, while the coefficient of friction (COF) value decreased. The addition of hBN alone did not significantly affect the hardness, regardless of the ratio, while the COF increased with the increasing hBN content. The COF value doubled with the addition of 10% hBN (COF = 0.22), whereas the addition of 90% Ti–10% hBN resulted in a decrease in the COF value, to COF = 0.83. The highest hardness value was obtained for the sample containing 28% Ti–2% hBN (66.5), while the lowest was for the sample containing 10% hBN (63.2). The wear track analysis, including its height and width caused by deformation, was detected using a focal differentiation microscope and scanning electron microscopy. Additionally, EDS maps were generated to determine the wear characteristics of the composite.

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The Friction of Structurally Modified Isotactic Polypropylene

Cited by 4 publications

References 60 publications

Fabrication of Polypropylene Nanoplastics Via Thermal Oxidation Reaction for Human Cells Responsiveness Studies

Fabrication of Polypropylene Nanoplastics Via Thermal Oxidation Reaction for Human Cells Responsiveness Studies

β-Nucleated Polypropylene: Preparation, Nucleating Efficiency, Composite, and Future Prospects

Influence of Inorganic Additives on the Surface Characteristics, Hardness, Friction and Wear Behavior of Polyethylene Matrix Composites

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