Electret properties of cycloolefin-copolymer-polypropylene blends

Yang, G.M.; Sessler, G.M.; Hatke, Wilfried

doi:10.1109/ise.1999.832051

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…An addition of 10% of ethylene–propylene copolymer to low‐density polyethylene increases the activation of charge traps and decreases the mobility of charges in the material 7. Blends of polypropylene with cyclo‐olefin copolymers also show various degrees of improved electret properties, seemingly depending on blend composition 8. Furthermore, it was reported9 that blends with higher content of one of the polymers have enhanced electret properties.…”

Section: Introductionmentioning

confidence: 99%

“…The charge storage behaviour of polymers depends on many factors, such as chemical constitution, chemical additives, crystallinity and overall morphology. Heterogeneous material systems, like polymer blends, have been shown to have improved electret properties compared with neat polymers 6–9. The accumulation of charge carriers in the interface between different phases, known as Maxwell–Wagner polarization,10 is recognized as the main mechanism of polarization.…”

Section: Introductionmentioning

confidence: 99%

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Charge storage of ternary polymer blends based on poly(phenylene ether)

Lovera

Ruckdäschel

Altstädt

et al. 2009

Polymer International

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BACKGROUND: Charge storage capability is a fundamental property of polymers used in electromechanical transducer applications. In this work, the charge retention of ternary blends of poly(phenylene ether) and polystyrene modified with poly(styrene‐co‐acrylonitrile), polystyrene‐block‐poly(ethylene‐co‐butylene)‐block‐polystyrene or polystyrene‐block‐polyisobutylene‐block‐polystyrene (SIBS) triblock copolymers was correlated with the blend composition, final morphology and the chemical structure of the components. RESULTS: It was determined that the charge storage capability is favoured by a finely dispersed and non‐interconnected phase and can be reduced by high polarity or low molecular weight of the blend components. Additionally, the molecular weight and the amount of styrene of the copolymers also determined the phase morphology, which in turn affected the charge retention. The use of SIBS for the ternary blends, especially in small quantities, significantly improved the charge storage. As such, 100 µm films with a surface potential of about 400 V were able to retain up to 240 V (60%) after 24 h at 130 °C. CONCLUSION: The electret behaviour of the polymer blends was influenced by a complex relationship between chemical structure, molecular weight and phase morphology. Copyright © 2009 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Charge storage of ternary polymer blends based on poly(phenylene ether)

Lovera

Ruckdäschel

Altstädt

et al. 2009

Polymer International

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“…Moreover, what deserves notice is that COC was discovered with better electret property than PP in 1996. It was also found to have better machining property than FEP, and especially, better stability to store positive charge storage [7]. After that, Blended COC/PP and blended COC/HDPE polymers which has price superiority and malleability strength were proposed in 1999 and 2006, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…After that, Blended COC/PP and blended COC/HDPE polymers which has price superiority and malleability strength were proposed in 1999 and 2006, respectively. Blended COC/PP and COC/HDPE were proved to have better charge storage stability first [8] [9]. Later, additives to improve the electret properties of COC solution method were applied on electret loudspeaker diaphragm fabrication [10].…”

Section: Introductionmentioning

confidence: 99%

A blended polymer electret-based micro-electronic power generator

Lee

Chen

et al. 2008

SPIE Proceedings

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Recently, power harvesting technologies for low-power electronic devices have attracted much interest. In this paper, the design and fabrication methods of a micro-electrostatic power generator is presented. This power generator comprises a stator developed using an electret film for charge storage and a rotor covered by an interdigital electrode for electric power generation. The newly developed electret material is made from mixing two solutions. The first solution was made by blending polystyrene (PS) and cycloolefin copolymer (COC). The second solution was obtained by an additive process as polar molecule was added into COC. This unique two solution electret method can easily be integrated and adopted to the micro fabrication process. The charge storage capability of this new electret material was investigated and results showed that low concentration of polystyrene in the blended material will not only have more stable but also higher electrostatic charge than that of pure COC. In addition, the polar molecular additives also improve the electret properties of COC due to micro-cavities formation and the interactions between molecules and polymer. Our newly developed blended electret material has excellent mechanical properties and is easy to use when compared to using Teflon Fluorinated Ethylene Propylene (FEP) and polypropylene (PP). A feasibility study of a micro electrostatic power generator based on our blended electret material was performed. Experimental results demonstrate the feasibility and effectiveness of this new type of micro electrostatic power generator.

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“…However, the beneficial properties of PTFE are constricted by the complicated and limited processing methods [5]. Therefore, considerable attention is given to other thermoplastic polymers such as cycloolefine copolymers (COC) [6] and isotactic polypropylene (i-PP) [7].…”

Section: Introductionmentioning

confidence: 99%

Development of porous polypropylene blends with NA11 particles and glass hollow spheres by biaxial stretching for electret applications

Behrendt

Altstädt

Schmidt

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

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In the present work, the development of cellular films by stretching isotactic polypropylene (i-PP) filled with NA11 (2,2'-methylene-bis-(4,6-di-tert-butylphenyl)-phosphate) particles and hollow glass spheres is reported. Morphology, electret properties and piezoelectric activity are investigated. An enhancement of the charge storage stability for the cellular films is due to the formation of cavities, which retard the drift of charges through the volume of the film. Furthermore, the cellular stretched i-PP films with hollow glass spheres were made piezoelectric by suitable corona poling method. Films were stretched to draw ratios of 3.5 : 3.5 (medium stretched) and selected samples were drawn to ratios of 5:5 (highly stretched). The applied draw ratio was found to directly influence the cavity formations and by this the electret and piezoelectric properties. Excellent electret properties were obtained in the case of highly stretched i-PP films containing 10 wt% of NA11, known as a nucleating agent additive for i-PP. Additionally, piezoelectric activity (d 33 = 179 pC/N) was observed in these films. i-PP films with glass spheres showed piezoelectric coefficients between 17 and 170 pC/N, depending on glass sphere size and concentration as well as on draw ratio.

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Electret properties of cycloolefin-copolymer-polypropylene blends

Cited by 10 publications

References 6 publications

Charge storage of ternary polymer blends based on poly(phenylene ether)

Charge storage of ternary polymer blends based on poly(phenylene ether)

A blended polymer electret-based micro-electronic power generator

Development of porous polypropylene blends with NA11 particles and glass hollow spheres by biaxial stretching for electret applications

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