Achieving very high fraction of β-crystal PVDF and PVDF/CNF composites and their effect on AC conductivity and microstructure through a stretching process

Sun, Lingyu; Li, B.; Zhang, Z.G.; Zhong, Wei‐Hong

doi:10.1016/j.eurpolymj.2010.09.003

Cited by 124 publications

(61 citation statements)

References 40 publications

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“…Mainly, the β and γ phases were more attractive due to their high spontaneous polarization property . Up to date, many efforts have been adopted to enhance the electroactive β phase thus promoting self‐polarization through methods like in‐situ mechanism, Langmuir‐Blodgett, spin coating, phase inversion method, mechanical stretching, electrospinning and substitution of fillers atoms Mendez et al. stated that β phase was improved through the substitution of CNT as fillers through sonication methodology compared to the mechanical mixture route .…”

Section: Introductionmentioning

confidence: 99%

Role of Cationic Oxidation States to Enhance the Electroactive β‐Phase of Poly(vinylidene Fluoride) and its Energy Harvesting Performance

et al. 2018

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Transparent, flexible and efficient ferroelectric composite films were fabricated by a simple ultrasonication approach followed by thermal treatment. The enhanced electroactive β‐phase and stabilization of the ferroelectric poly(vinylidene fluoride) (PVDF) polymer were analyzed by the substitution of various cations with different oxidation states (Li1+, Al3+) as fillers. The electroactive β‐phase was obtained due to the stretching of −CH2−/−CF2− molecular chains, stress‐induced effects during the sonication process and the interfacial interaction between the molecular chains and the surface charge of foreign elements. Further, a flexible ferroelectric nanogenerator was implemented and subjected to harness the waste biomechanical energy. The PVDF/Al3+ composite film‐based device gave the maximum amount of voltage and current of 189 V and 0.97 μA respectively at 2 N force. This high electrical output is caused by the electrostatic interaction between electronegative fluorine atoms and the surface active, positive charged ions of the fillers. The obtained maximum instantaneous power density of the FF‐CNG device at 20 MΩ load resistance is 1.92 mW/m2. The generated output is used to power up commercial light‐emitting diodes and display devices without using storage components. The proposed approach for enhancing the throughput of ferroelectric polymers can pave the way to develop new smart composite films for efficient energy conversion.

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Section: Introductionmentioning

confidence: 99%

Role of Cationic Oxidation States to Enhance the Electroactive β‐Phase of Poly(vinylidene Fluoride) and its Energy Harvesting Performance

et al. 2018

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“…Electrospinning is a widely employed method in recent years to produce polymer nanofiber with high surface areas, which could be well employed as metal supporting matrix for catalytic application [24e26]. Poly(vinylidene fluoride) (PVDF) is one of the most widely studied polymers for their excellent properties [27,28].…”

Section: Introductionmentioning

confidence: 99%

Nanocatalyst: Electrospun nanofibers of PVDF – Dicationic tetrachloronickelate (II) anion and their effect on hydrogen generation from the hydrolysis of sodium borohydride

Chinnappan

Kim

2012

International Journal of Hydrogen Energy

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“…Net polarization generates dielectric properties for that particular sample and this property had been applied worldwide and mainly used as capacitors in electronic devices. The study of stretched PVDFf films and PVDF composite show high β-phases in comparison to unstreched PVDF films (Salimi and Yousefi, 2003;Sun et al, 2010).…”

Section: Introductionmentioning

confidence: 90%

Dielectric Properties of Collagen on Plasma Modified Polyvinylidene Fluoride

Dhia¹

2012

American Journal of Applied Sciences

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Problem statement:The attachment of biopolymers such as collagen on inert polymeric template created great challenge due to hydrophobic nature of polymeric material. The modification of PVDF for improved adhesion and introduction of specific functionalities have been widely recognized in various industrial applications. Typical methods for modifying polymer surface such as chemical etching and UV irradiation are not favorable as it requires high temperature and the use of chemical solvents. However plasma modification is suitable as it utilizes low heat and a clean environment, thus preventing contamination on the deposited collagen. Approach: Free standing orientated Poly (Vinylidene Fluoride) (PVDF) films were fabricated by solution casting method and dried in a convention oven. The dried PVDF films were orientated in a tensile machine at temperature 70°C enclosed in a custom made environmental chamber. The pulling rates of 5 mm min −1 were utilized with a draw ratio of 2 (R = L final /L initial ). The PVDF film was plasma treated for 60 sec to enhance the hydrophilic property of PVDF and utilized as template for collagen deposition. The deposited collagen on surface of PVDF was left in desiccators at temperature of 24°C for complete drying. Results: The untreated and plasma-treated PVDF template were observed for water contact angle measurement, the functional group and dielectric properties of collagen were observed and measured by FTIR and SOLARTRON respectively. Conclusion:The orientated PVDF films were produced at pulling speed of 5 mm min −1 and temperature of 70°C. The hydrophobic PVDF surface was transformed to a hydrophilic surface by plasma treatment for collagen deposition. The FTIR result shows the overlapping peaks of C-H and C-F in range 1500-1000 cm −1 which indicates the C-C bonding of collagen and PVDF. The significant increase in dielectric constant is a result from the favorable bonding between collagen and PVDF template.

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Achieving very high fraction of β-crystal PVDF and PVDF/CNF composites and their effect on AC conductivity and microstructure through a stretching process

Cited by 124 publications

References 40 publications

Role of Cationic Oxidation States to Enhance the Electroactive β‐Phase of Poly(vinylidene Fluoride) and its Energy Harvesting Performance

Role of Cationic Oxidation States to Enhance the Electroactive β‐Phase of Poly(vinylidene Fluoride) and its Energy Harvesting Performance

Nanocatalyst: Electrospun nanofibers of PVDF – Dicationic tetrachloronickelate (II) anion and their effect on hydrogen generation from the hydrolysis of sodium borohydride

Dielectric Properties of Collagen on Plasma Modified Polyvinylidene Fluoride

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