Effect of dopant and DC bias potential on dielectric properties of polyvinyl alcohol (PVA)/PbTiO3 - composite films

Joshi, Girish M.; Khatake, S.M.; Kaleemulla, S.; Rao, N. Madhusudhana; Cuberes, M. Teresa

doi:10.1016/j.cap.2011.03.068

Cited by 23 publications

(4 citation statements)

References 11 publications

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“…Generally, the k of the composites could be obviously improved by adding up to 50 vol% of these llers. 5,6 Unfortunately, the mechanical and processing properties were greatly deteriorated as a result of the high loading of these llers. Another widely used strategy is to prepare conductive polymer composites, among which, multi-walled carbon nanotubes (MWCNTs) is the widely used conductive ller due to their large aspect ratio, unique mechanical properties and high electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Dramatically improved dielectric properties of polymer composites by controlling the alignment of carbon nanotubes in matrix

et al. 2014

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Aligned multi-walled carbon nanotubes (MWCNTs)/polyvinyl alcohol composite films were prepared by using an easy and controllable electrospinning-in situ film-forming (EF) technique. A high dielectric constant (k), a low dielectric loss, a consistently high breakdown strength, and a high energy density were obtained by using this technique. The dramatically improved dielectric properties are ascribed to the good dispersion and alignment of MWCNTs in the matrix, facilitating the formation of a large number of separated nano-capacitors (high k and low direct current (DC) conductance). For comparison purposes, the same composite films were prepared by solution casting (SC). At the same MWCNT content, the SC method yielded a higher k, but a significantly higher dielectric loss and much lower breakdown strength and energy density because of the random dispersion of MWCNTs in the matrix and the formation of a MWCNT network, which result in a large increase in DC conductance. The formation mechanism of the different microstructures and the relationships between the microstructures and dielectric properties are clarified. Our results indicate that high-performance MWCNTs/polymer dielectric composites can be obtained by controlling the microstructure of the composites by using the EF technique, which widens the applications of dielectric materials.

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Section: Introductionmentioning

confidence: 99%

Dramatically improved dielectric properties of polymer composites by controlling the alignment of carbon nanotubes in matrix

et al. 2014

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“…These nanoparticles generally tend to form a complex with the polymer chain and thereby increase the physical parameters of the polymer composites. In recent years, polyvinyl alcohol (PVA) is used as a basic polymer because of its unique properties such as good chemical stability, biodegradable, eco-friendly, electrical, and optical properties, and hydrophilicity [8,9]. The significant feature of PVA is its semicrystalline nature that is the presence of both crystalline and amorphous regions causing crystal-amorphous interfacial effects which increases the physical properties.…”

Section: Introductionmentioning

confidence: 99%

Advancement in Microstructural, Optical, and Mechanical Properties of PVA (Mowiol 10-98) Doped by ZnO Nanoparticles

Kumar

Crasta²,

Praveen

2014

Physics Research International

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The current paper explores the preparation of PVA nanocomposites by doping with zinc oxide (ZnO) nanoparticles using the method of coagulation and solvent casting technique. The dopant zinc oxide nanoparticle is prepared by simple precipitation method and is confirmed by the X-ray diffraction (XRD) studies. The XRD studies explore that the average particle size of the synthesized nanoparticles is 55 nm and show that the crystallinity factor of PVA nanocomposites is influenced by the interaction occurring between the PVA main chain and the ZnO nanoparticle. The FTIR spectroscopy suggests that the formulation of complexes occurring between the dopants and the PVA main chain is due to inter or intra molecular hydrogen bonding. UV-vis spectra explore the dramatic decrease in the optical energy gap of nanoparticles doped polymer composites and the variations of Urbach energy ( u ) related to crystallinity for various dopant concentrations. The mechanical properties of the PVA nanocomposites were explored using universal testing machine (UTM) that reflects that, for = 15% doping concentration, there is an increase in the tensile strength, stiffness, and Young's modulus, whereas, for = 7.5% concentration, the percentage total elongation at fracture is found to be the maximum. The morphological behavior and homogenous nanoparticle distribution in the composites were examined by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDAX).

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“… 2 )) into polymers. In this case, a high loading (up to 50 vol%) of ceramic fillers is often required to arrive at the desired dielectric constant of about 50 in the ceramic/polymer composites, 3 resulting in processing difficulties, low flexibility, and excessive weight, all of which limit the wide application of composites. Another widely used approach is to prepare percolative composites by introducing conductive fillers such as metal particles, 4 carbon nanotubes (CNTs) 5–7 or graphene sheets 8 into polymers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of graphene/polypropylene composites with high dielectric constant and low dielectric loss via constructing a segregated graphene network

et al. 2021

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Effect of dopant and DC bias potential on dielectric properties of polyvinyl alcohol (PVA)/PbTiO3 - composite films

Cited by 23 publications

References 11 publications

Dramatically improved dielectric properties of polymer composites by controlling the alignment of carbon nanotubes in matrix

Dramatically improved dielectric properties of polymer composites by controlling the alignment of carbon nanotubes in matrix

Advancement in Microstructural, Optical, and Mechanical Properties of PVA (Mowiol 10-98) Doped by ZnO Nanoparticles

Preparation of graphene/polypropylene composites with high dielectric constant and low dielectric loss via constructing a segregated graphene network

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