Fluorinated cellular polypropylene films with time-invariant excellent surface electret properties by post-treatments

An, Zhenlian; Mao, Mingjun; Yao, Junlan; Zhang, Yewen; Xia, Zhang

doi:10.1088/0022-3727/43/41/415302

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…Кроме того, известно, что относительно слабое электрическое поле может нарушать процесс адгезирования клеток к поверхности [37,38]. Принцип получения электретных поверхностей заключается в проводимой при определенных условиях плазменной обработке поверхности полимерного материала, способного образовать электрет [39][40][41][42][43][44]. При помещении в зараженную рабочую среду электретная поверхность образует вокруг себя зону отчуждения и зону задержки роста, по тому же принципу, как это происходит при вымывании биоцида из высвобождающей поверхности.…”

Section: рисunclassified

Methods of Preventing Biofilms Formation on the Surfaces of Polymer Materials

Lyusova

Ilyin

Shibryaeva³

2018

Fine Chem. Tech.

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One of the harmful factors of the interaction of microorganisms with the technosphere is the formation of biofilms on the surface of various products. Steady colonies of bacteria ensure a stable contamination of the handling medium of the product, and their release is a cause of biodestructive processes in materials. In many cases, single or even regular antimicrobial treatment does not lead to complete suppression of colony formation. Therefore, today the most demanded methods of preventing biofilms formation involve the creation of materials that are resistant to colonization by bacteria. Since bacteria cells directly interact with the surface of the material, it is the surface that should have antibacterial properties. In the review, various methods of preventing the formation of biofilms by the example of polymeric materials are considered. The main attention is paid to the methods of creating antibacterial surfaces, which in various ways prevent the formation of biofilms. In accordance with the world practice, all antibacterial surfaces are divided into four types: releasing, contact-active, repelling and self-polishing. The advantages and disadvantages of each type of antibacterial surfaces, their existing limitations in use and prospects for further development are noted. Information on the compatibility of individual types of surfaces is also noted in the literature.

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Section: рисunclassified

Methods of Preventing Biofilms Formation on the Surfaces of Polymer Materials

Lyusova

Ilyin

Shibryaeva³

2018

Fine Chem. Tech.

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“…Minimization of the charge accumulation needs optimizing the spacer profile [6][7][8]. At the same time, it requires decreasing the micro-protrusions on the electrode surface, metallic and=or dielectric particles inside GIS, and field emission at the triple junction of the electrode= spacer=gas [9][10][11][12][13][14]. Though all the efforts have been made, it is also inevitable for charge to arrive at the insulator surface.…”

Section: Introductionmentioning

confidence: 99%

Surface Electrical Properties of Fluorinated Epoxy Resin and Influence of Ambient Humidity

Liu

2014

Materials and Manufacturing Processes

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As-prepared epoxy resin samples were surface fluorinated using a F 2 /N 2 mixture. The fluorination resulted in a remarkable increase in surface conductivity of the epoxy sample by over three orders of magnitude. Corona charges deposited on the fluorinated surface could not be stored even at room temperature. Obvious dependence of surface conductivity and steady state surface current on ambient humidity was found for the fluorinated sample. ATR-IR analysis and SEM imaging of surface and cross-section demonstrated substantial changes in surface layer chemical composition and morphology due to the fluorination, which are responsible for the changes in surface electrical properties.

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Significantly improved piezoelectric thermal stability of cellular polypropylene films by high pressure fluorination and post-treatments

Mao

Cang

et al. 2012

Journal of Applied Physics

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Cellular polypropylene (PP) films were fluorinated under a high pressure of 13 bar of the F2/N2 mixture and were post-treated by nitrous oxide and isothermal crystallization. The fluorinated and post-treated PP films after being expanded and corona charged exhibit a significantly improved piezoelectric thermal stability. After annealing at 70 °C for 151 h or at 90 °C for 224 h, the piezoelectric d33 value of the fluorinated and post-treated piezoelectric sample still retains 58% or 45% of its initial d33 value, while the corresponding value of the virgin piezoelectric sample has decreased to 29% or 15% of the initial value. Chemical composition analysis of the cross section of the fluorinated and post-treated film by energy-dispersive x-ray spectroscopy indicates that the internal layers have been fluorinated, in spite of a lower degree of fluorination compared with the fluorinated surface layer. Short-circuit and open-circuit TSD current measurements reveal that the fluorinated internal layers, like the fluorinated surface layer, also have very deep charge traps, although there probably is a difference in density of the deep traps between them. The deeply trapped charge on the internal layers of the fluorinated and post-treated piezoelectric sample is responsible for its significantly improved piezoelectric thermal stability.

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Fluorinated cellular polypropylene films with time-invariant excellent surface electret properties by post-treatments

Cited by 7 publications

References 33 publications

Methods of Preventing Biofilms Formation on the Surfaces of Polymer Materials

Methods of Preventing Biofilms Formation on the Surfaces of Polymer Materials

Surface Electrical Properties of Fluorinated Epoxy Resin and Influence of Ambient Humidity

Significantly improved piezoelectric thermal stability of cellular polypropylene films by high pressure fluorination and post-treatments

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