Nucleation of isotactic polypropylene by triphenylamine-based trisamide derivatives and their influence on charge-storage properties

Mohmeyer, Nils; Müller, Bettina K. M.; Behrendt, Nico; Hillenbrand, J.; Klaiber, Martin; Zhang, Xiaoqin; Smith, Paul; Altstädt, Volker; Sessler, G. M.; Schmidt, Hans‐Werner

doi:10.1016/j.polymer.2004.07.046

Cited by 52 publications

(50 citation statements)

References 12 publications

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“…Recently, the addition of special nucleating agents based on triphenylamide derivatives at optimal concentration was found to influence the charge storage properties of polypropylene films. 9 In addition, the mechanical deformation of films is a possibility to improve the charge storage behavior of semicrystalline polymers. 10,11 Here, it is assumed that the drawing influences the amorphous and crystalline morphology, and thereby increases the number and efficiency of traps.…”

Section: Introductionmentioning

confidence: 99%

Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Behrendt

Mohmeyer

Hillenbrand

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:A study on the influence of the crystal modification (␣ and ␤) of isotactic polypropylene (i-PP) films on the resulting electret properties is presented. Two commercial nucleating agents, sodium 2,2Ј-methylene-bis(4,6-di-tertbutylphenyl)-phosphate (NA11) and N,NЈ-dicyclo-hexyl-2,6-naphthalene-dicarbox-amide (NU100), were employed in this investigation. Isothermal charge decay was measured at 90°C. In hot pressed isotropic polypropylene films, no significant differences in the charge storage properties were observed for ␣-and ␤-nucleated specimens. In addition, the article presents the influence of the nucleating agents at different concentrations on the PP-film morphology of biaxially stretched films with respect to electret features. It was possible to prepare elongated cavities with the virtually insoluble NA11 additive during stretching, even at concentrations below 0.3 wt %. These films displayed slightly improved electret properties in comparison to stretched neat PP films due to generated cavities acting as barriers for the drift of charges. Various draw ratios were also studied for i-PP films with 0.15 wt % NA11.

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Section: Introductionmentioning

confidence: 99%

Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Behrendt

Mohmeyer

Hillenbrand

et al. 2005

J of Applied Polymer Sci

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“…In the case of PP, the very effective classes of supramolecular bis-and trisamide additives [16][17][18] showed no or a detrimental effect. The phosphonite additives acting as efficient charge traps in PEI [15] also exhibited no significant effect in polycarbonate.…”

Section: Bisimide Additivesmentioning

confidence: 99%

“…The films were charged for 30 s in a standard point-to-plate corona triode employing a grid voltage of þ400 V (grid size: 0.2 mm) and a corona voltage of þ12.5 kV. [15][16][17][18]24,29,[32][33][34] The grid ensures uniform film surface potentials between 400 V and 420 V. [35] The charge storage characteristics of the obtained electret films were evaluated by the ITPD method. Here the surface potential of the electrets films is determined as a function of the exposed time at elevated isothermal temperatures, which was the standard temperature of T ITPD ¼ 90 8C unless otherwise noted.…”

Section: Physical Agingmentioning

confidence: 99%

“…Here the surface potential of the electrets films is determined as a function of the exposed time at elevated isothermal temperatures, which was the standard temperature of T ITPD ¼ 90 8C unless otherwise noted. [15][16][17][18]29,[32][33][34] The film samples were placed on top of a computer-controlled xy table and the surface potential was measured by a capacitive probe connected to an electrostatic voltmeter (Monroe Electrostatic Voltmeter 244A) at nine defined locations 2 mm above the sample surface on each film. The first measurement was taken at room temperature immediately after charging.…”

Section: Physical Agingmentioning

confidence: 99%

“…[10,[15][16][17][18][34][35][36] The degree of improvement strongly depends on chemical structure and concentration of the additive with respect to the nature of the polymer.…”

Section: Bisimide Additivesmentioning

confidence: 99%

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Tailored Additives to Improve the Electret Performance of Polycarbonates

Erhard

Lovera

Jenninger

et al. 2010

Macro Chemistry & Physics

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An electret is a dielectric material exhibiting a quasi‐permanent electric charge. The aim of this work is to give access to PC electret materials with a distinctly improved electret performance. In this context, the charge storage capabilities of corona charged films of several PC grades were investigated by isothermal potential decay measurements at 90 °C. The most promising PC grade was further improved by a new class of bisimide additives. The best additive at the most efficient concentration in combination with a physical aging step yielded excellent PC electrets maintaining almost their complete applied charge even at 90 °C.

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Cellular Polymer Ferroelectret: A Review on Their Development and Their Piezoelectric Properties

et al. 2016

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Because of their ability to show ferroelectret behavior when exposed to an external electric field, cellular polymers have been recently considered for ferroelectret applications. These cellular polymer films can be produced by stretching or foaming, but depending on the application and conditions, different polymers, such as polypropylene (PP), poly(ethylene terephthalate), poly(ethylene naphthalate), poly(tetrafluoro ethylene), cross-linked PP, and some cyclo-olefines, have been considered. Nevertheless, cellular PP was the most investigated material because of its outstanding properties such as high piezoelectric d 33 coefficient, flexibility, good fatigue resistance, good charge trapping properties, and low cost. In this review, recent advances related to the materials used for ferroelectret applications and their processing are discussed. The effect of different parameters such as pressure, electrical breakdown strength of the gas phase, presence of fillers, and service temperature on the d 33 coefficient is presented and discussed. C

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Nucleation of isotactic polypropylene by triphenylamine-based trisamide derivatives and their influence on charge-storage properties

Cited by 52 publications

References 12 publications

Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Charge storage behavior of isotropic and biaxially‐oriented polypropylene films containing α‐ and β‐nucleating agents

Tailored Additives to Improve the Electret Performance of Polycarbonates

Cellular Polymer Ferroelectret: A Review on Their Development and Their Piezoelectric Properties

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