Preparation and characterization of modified polypropylene by using electron beam irradiation

Dahal, Prashanta; Kim, Youn Cheol

doi:10.1016/j.jiec.2013.02.027

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…The results obtained are similar to those of the authors who found out that: Irradiated isotactic Polypropylene (PP) by gamma rays has better mechanical and thermal properties [10]. Crosslinked PP by electron beam radiation shows the increase of its hardness [11]. After irradiation of PP loss of crystallinity, a drop of mechanical properties and melting point depression and reduction of molecular weight can occur [12].…”

Section: Discussionsupporting

confidence: 87%

Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

Ovsík

Staněk

Řezníček

et al. 2018

MSF

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Cross-linking is a process in which polymer chains are associated through chemical bonds. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behavior. This paper describes the effect of electron beam irradiation on the nanoindentation creep of unfilled and glass fiber filled polypropylene (25%). nanoindentation creep were measured by the DSI (Depth Sensing Indentation) method on samples which were non-irradiated and irradiated by different doses of the β – radiation (0, 30, 45 and 60 kGy). The purpose of the article is to consider to what extent the irradiation process influences the resulting nanoindentation creep measured by the DSI method. The unfilled and filled polypropylene tested showed significant changes of indentation creep. The measured results indicate, that electron beam irradiation is very effective tool for improvement of creep properties of unfilled and filled polypropylene. The nanoindentation creep after irradiated unfilled Polypropylene was decreased up to 16 % (filled polypropylene was decreased up to 9%) compared to non-irradiated surface. These changes were examined and confirmed by Gel content.

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Section: Discussionsupporting

confidence: 87%

Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

Ovsík

Staněk

Řezníček

et al. 2018

MSF

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“…Low-energy EB accelerators (120-300 keV) are most commonly used for adhesives, coatings for paper, multilayer packaging, and the surface grafting of membranes [62]. Mid-energy EB accelerators (300 keV to 5 MeV) are utilized for the polymerization of monomers, the grafting of monomers onto polymers, the cross-linking of polymers, the degradation of polymers and fiber modification [63][64][65][66][67][68][69][70][71][72][73][74][75][76]. Finally, high-energy (5-10 MeV) EB accelerators are used for the sterilization of medical devices, pharmaceutical and biological products, bio-ethanol products, and the treating of industrial effluent [60,65,.…”

Section: Introductionmentioning

confidence: 99%

An overview of new oxidation methods for polyacrylonitrile-based carbon fibers

Shin¹,

Park²,

Kim³

et al. 2015

Carbon letters

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The process of oxidizing polyacrylonitrile (PAN)-based carbon fibers converts them into an infusible and non-flammable state prior to carbonization. This represents one of the most important stages in determining the mechanical properties of the final carbon fibers, but the most commonly used methods, such as thermal treatment (200°C to 300°C), tend to waste a great deal of process time, money, and energy. There is therefore a need to develop more advanced oxidation methods for PAN precursor fibers. In this review, we assess the viability of electron beam, gamma-ray, ultra-violet, and plasma treatments with a view to advancing these areas of research and their industrial application.

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“…For biomedical applications, polypropylene is widely used to manufacture catheters, syringes, membranes for filters and water purification. It is also found in food packaging supplies and textiles such as films and non-woven fibers [9,10]. Although it is extensively used in medical supplies, it does not possess antibacterial properties.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene modified with Cu–N-doped titanium dioxide forantibacterial applications

Betancur-Henao¹,

Hernández-Montes²,

Santa³

et al. 2020

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Titanium dioxide (TiO 2 ) is an attractive biomaterial for its antibacterial properties. In this paper, TiO 2 nanoparticles were co-doped with copper and nitrogen and deposited onto polypropylene (PP) by the dip-coating technique. The nanoparticles were synthesised via the sol-gel technique and co-doped by the wet impregnation method. The physicochemical properties of the samples were characterised using scanning electron microscopy (SEM), wavelength-dispersive spectrometry (WDS), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-vis) spectroscopy. The band gap energy was determined using a Tauc plot. The antibacterial activity was evaluated against gram-positive, gram-negative, and multiresistant bacteria by measuring the number of colony-forming units (CFUs). All the tests were conducted in the presence of visible light. The results showed that the nanoparticles have a mean diameter of 20.40±5.50 nm. The Cu-N-doped nanoparticles showed a 23% decrease of the band gap compared to their unmodified counterparts. The PP showed homogeneous coatings with a mean thickness of 33.00±1.70 μm. The PP modified with Cu-N-doped TiO 2 exhibited strong antibacterial activity against E. coli (81%), S. aureus (98%) and methicillin-resistant S. aureus (MRSA) (97%) compared to unmodified PP. The results demonstrated the antibacterial activity of TiO 2 -Cu-N nanoparticles against gram-negative and gram-positive bacteria and their potential use in biomedical applications.

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Preparation and characterization of modified polypropylene by using electron beam irradiation

Cited by 12 publications

References 19 publications

Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

Study of Nano-Creep of Unfilled and Filled Cross-Linking Polypropylene

An overview of new oxidation methods for polyacrylonitrile-based carbon fibers

Polypropylene modified with Cu–N-doped titanium dioxide forantibacterial applications

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