In situ coupling of chitosan onto polypropylene foils by an Atmospheric Pressure Air Glow Discharge with a liquid cathode

Nikitin, Daniil; Choukourov, Andrei; Титов, В. А.; Kuz’micheva, L. A.; Lipatova, I. M.; Mezina, E. A.; Aleksandriiskii, V. V.; Shelemin, Artem; Khalakhan, Ivan; Slavı́nská, D.; Biederman, Hynek

doi:10.1016/j.carbpol.2016.08.023

Cited by 14 publications

(12 citation statements)

References 42 publications

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“…Only two components were applied in the deconvolution procedure: C-C component located at the binding energy of 285.0 eV is associated with all C-C and C-H bindings present in the polymer structure and C-O component located at the binding energy of 286.4 eV. The latter position corresponds with a component usually located in the range of 286-287 eV, which is ascribed to the presence of C-O linkages in the polymer [35][36][37][38]. The relative content of carbon atoms in C-C and C-O components was evaluated for both samples.…”

Section: Samplementioning

confidence: 99%

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

et al. 2020

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Isotactic-polypropylene (i-PP) films with inorganic minerals such as Sillikolloid, perlite, or glass beads were prepared. The obtained polymeric films were subjected to an orientation process. Moreover, this paper includes results how the artificial accelerated weathering influences surface properties of the unoriented and oriented i-PP films with the mineral fillers. Changes in the ultraviolet (UV) treated polymeric films were studied with attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and by measuring contact angles. The results revealed that photooxidation of i-PP was more effective in the presence of the fillers and depended on the type of the filler but not on its amount. Moreover, the oriented samples experienced more effective photooxidation compared with the unoriented ones. In all studied samples the same photoproducts were detected, suggesting the same route of polymer photooxidation with and without the filler. These polymeric films were produced for potential applications in the devices in which piezoelectric effect can be used.Polymers 2020, 12, 562 2 of 18 in their structures. This ordered charge arises from an unordered electric charge being in this material or implemented to the material during polarization. In the case of semi-crystalline polymers, the polar crystalline phase is oriented under a strong electric field at elevated temperature. The amorphous phase, also present in such polymers, maintains the polarization of molecular dipoles in the crystalline phase. Semi-crystalline poly(vinylidene fluoride) (PVDF) is the most known piezopolymer with its piezoelectric charge constant, d 33 about 20-28 pC/N [1-4]. The piezoelectric charge constant, d 33 , is the quantity which refers to the piezoelectric effect and is defined as the charged density generated upon applied stress. Generally, the higher d 33 value the better piezoelectric properties of a material [1,4].PVDF copolymers, polyamides, Parylene-C, liquid crystal polymers belong to the semi-crystalline polymers exhibiting piezoelectric properties [1,2].Amorphous polymers have to possess molecular dipoles in their structure. Heating the amorphous polymers above the glass transition temperature, T g , and applying a strong electric field orients the present molecular dipoles. Afterwards, lowering the temperature in the presence of the electric field makes the molecular dipoles frozen, and the material becomes polarized. The mobility of polymer chains is greater above T g and reduces below T g . The stiffness and brittleness are the characteristics of polymers below T g in a glassy state, while elasticity and softness are typical of polymers above T g in a rubbery state.Amorphous bulk polymers encompass polyimides and polyacrylonitrile [1,2]. Combination of piezoceramics and polymers results in the formation of polymer composites in which the piezoceramics particles are dispersed in the polymer matrix. The aim of such procedure is to obtain...

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Section: Samplementioning

confidence: 99%

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

et al. 2020

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“…Another mechanism that can be used to overcome the poor mechanical strength of chitosan is represented by its immobilization onto the surface of other polymer supports, such as polypropylene, polyethylene, polystyrene, etc. [ 137 , 141 , 142 , 143 , 144 ].…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Antibacterial Activity of Chitosan and Chitosan Modified by Functionalization

Ardean

Davidescu

Nemeş

et al. 2021

IJMS

264

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The biomedical and therapeutic importance of chitosan and chitosan derivatives is the subject of interdisciplinary research. In this analysis, we intended to consolidate some of the recent discoveries regarding the potential of chitosan and its derivatives to be used for biomedical and other purposes. Why chitosan? Because chitosan is a natural biopolymer that can be obtained from one of the most abundant polysaccharides in nature, which is chitin. Compared to other biopolymers, chitosan presents some advantages, such as accessibility, biocompatibility, biodegradability, and no toxicity, expressing significant antibacterial potential. In addition, through chemical processes, a high number of chitosan derivatives can be obtained with many possibilities for use. The presence of several types of functional groups in the structure of the polymer and the fact that it has cationic properties are determinant for the increased reactive properties of chitosan. We analyzed the intrinsic properties of chitosan in relation to its source: the molecular mass, the degree of deacetylation, and polymerization. We also studied the most important extrinsic factors responsible for different properties of chitosan, such as the type of bacteria on which chitosan is active. In addition, some chitosan derivatives obtained by functionalization and some complexes formed by chitosan with various metallic ions were studied. The present research can be extended in order to analyze many other factors than those mentioned. Further in this paper were discussed the most important factors that influence the antibacterial effect of chitosan and its derivatives. The aim was to demonstrate that the bactericidal effect of chitosan depends on a number of very complex factors, their knowledge being essential to explain the role of each of them for the bactericidal activity of this biopolymer.

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“…Effect of atmospheric pressure plasma treatment on DSP Enzymatic hydrolysis-assisted thermal extraction was used for durian seed polysaccharide preparation and the yield of DSP was 10.05%. It has been reported that atmospheric pressure plasma treatment can be used as an e cient technique to improve the biological activity of natural materials [23,24]. Atmospheric pressure plasma was employed for the degradation of DSP, the color of sample changed from brown to taupe after treatment.…”

Section: Resultsmentioning

confidence: 99%

A Novel polysaccharide DSPP-1 from Durian seed: structure characterization and its neuroprotective effects against Alzheimer's disease in a transgenic Caenorhabditis elegans model

Xiao

Chen

Yuan

et al. 2023

Preprint

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Plant polysaccharides have attracted much attention because of their various biological activities. The structure characterization of polysaccharide from durian seed and its neuroprotective effects against Alzheimer's disease (AD) in a transgenic Caenorhabditis elegans model were conducted in this study. A water-soluble polysaccharide was obtained using atmospheric pressure plasma treatment, and named DSPP-1. DSPP-1 was composed of rhamnose, galactose and galacturonic acid and its molecular weight was 3.765×105 Da. The study in vitro showed that 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of DSPP-1 was 79.20% and the inhibitory rate on Aβ1-42 aggregation was 24.65%. In vivo results showed that DSPP-1 could decrease abnormal Aβ1-42 aggregation to delay the paralysis process of AD-nematodes. Moreover, DSPP-1 significantly improved the antioxidant enzyme activities and reduced lipid peroxidation in AD-nematodes. Taken together, these results indicated that DSPP-1 could be used as a potential natural source for the prevention and treatment of AD.

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In situ coupling of chitosan onto polypropylene foils by an Atmospheric Pressure Air Glow Discharge with a liquid cathode

Cited by 14 publications

References 42 publications

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

Factors Influencing the Antibacterial Activity of Chitosan and Chitosan Modified by Functionalization

A Novel polysaccharide DSPP-1 from Durian seed: structure characterization and its neuroprotective effects against Alzheimer's disease in a transgenic Caenorhabditis elegans model

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