Dielectric behaviour and conductivity of high-filled BaTiO3–PMMA composites and the facile route of emulsion polymerization in synthesizing the same

Brandt, K.; Neusel, Claudia; Behr, Sebastian; Schneider, Gerold A.

doi:10.1039/c3tc30204k

Cited by 27 publications

(24 citation statements)

References 23 publications

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“…Because of the low e r 0 of ZnO (e r 0 E 10), 26 both the nanocomposites have relatively low e r 0 s in comparison with PMMA/BaTiO 3 composites. 4,8,9 In addition, PMMA-ZnO has a smaller e r 0 than PMMA/ZnO, resulting from the better dispersivity of the ZnO nanoparticles for PMMA-ZnO. The same phenomenon has already been reported for a PMMA/BaTiO 3 composite system, and a detailed explanation is provided.…”

Section: Optical and Dielectric Properties Of The Molded Samplessupporting

confidence: 74%

“…BaTiO 3 , one of the ferroelectric metal oxides, has been most widely used for enhancement of e r 0 . [2][3][4][5][6][7][8][9][10] On the other hand, for other dielectric applications such as variable capacitors, pressure sensors, and touch sensors, a change of C for these systems is important, and high e r 0 is not always required. [11][12][13][14][15][16][17] The distance between two electrodes d and/or the area of the electrodes S are varied by physical operations, changing the C for the systems: C = e 0 e r 0 S/d, where e 0 is the permittivity of vacuum.…”

Section: Introductionmentioning

confidence: 99%

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Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Hayashida

Takatani

2016

J. Mater. Chem. C

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A series of poly(methyl methacrylate)-grafted ZnO nanoparticles (PMMA-ZnO) were synthesized using a surface-initiated polymerization technique and the optical and dielectric properties of PMMA-ZnO were studied. The dielectric constant e r 0 of PMMA-ZnO thin films was highly increased by irradiation of UV light. It is indicated that electrons in the ZnO nanoparticles are excited from a valence band to a conductive band by absorption of UV light, resulting in a large increase in e r 0 owing to Maxwell-Wagner polarization of the resultant free electrons. On the other hand, the dissipation factor (tan d) of PMMA-ZnO is very low and almost constant during UV irradiation because PMMA-ZnO is electrically insulated by the grafted PMMA chains on the ZnO nanoparticles. Also, it was confirmed that due to the grafted PMMA chains, PMMA-ZnO nanocomposites exhibited low light scattering in addition to strong absorption of UV light. The low light scattering of PMMA-ZnO would enhance the absorption efficiency of UV light and therefore contribute to the large increase in e r 0 for PMMA-ZnO. Thus, PMMA-ZnO is a promising material for high sensitivity and low loss UV light sensors using the change in e r 0 .

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Section: Optical and Dielectric Properties Of The Molded Samplessupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Hayashida

Takatani

2016

J. Mater. Chem. C

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“…However, one huge challenge still remains. That is, the increase of dielectric constant of the composites is still at the expense of the significant reduction of breakdown strength . This is because the introduction of high‐dielectric‐constant nanoparticles may also lead to serious electric field distortion and concentration in the nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Yang

Huang

et al. 2015

Adv Materials Inter

148

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high-energy-density storage devices, and electromechanical actuators. [1][2][3][4][5][6] In general, the traditional ferroelectric ceramics such as BaTiO 3 (BT) have large dielectric constant, but the low breakdown strength and poor processing property limit their application. On the other hand, despite having the merits of high breakdown strength, low dielectric loss and ease of processing, the polymer fi lms generally suffer from low dielectric constant (e.g., <5), which seriously limit their application in the next generation of energy storage devices. [ 7 ] Introducing high-dielectric-constant (high-k ) ceramics into polymer matrix is a classic approach to high-k composite materials and has been extensively investigated in the past decades. [8][9][10][11][12][13][14] However, the large electrical mismatch between ceramic fi llers and polymers usually results in signifi cant decrease of breakdown strength. In addition, the poor compatibility between the inorganic fi llers and the organic polymer matrix results in weak interfacial adhesion and aggregation, leads to high dielectric loss and further decrease of breakdown strength. [ 15,16 ] To solve these issues, a variety of novel nanostructured inorganic-organic hybrid fi llers (e.g., core-shell structured nanoparticles) have been developed. In such materials, the inorganic core processes high dielectric constant, and the organic shell generally provides strong interchain forces with polymer matrix [17][18][19][20] or directly acts as matrix. [21][22][23][24][25][26][27][28][29] Therefore, the interfacial adhesion between the inorganic fi llers and the organic polymer matrix can be improved and the dielectric properties of the resulting nanocomposites can be greatly enhanced. For example, via in situ metallocene catalytic olefi n polymerization, a series of core-shell structured polyolefi n-based nanocomposites with high dielectric constant and low dielectric loss were prepared by Marks and co-workers. [23][24][25][26][27] Through in situ atom transfer radical polymerization (ATRP) [ 22 ] and reversible addition-fragmentation chain transfer (RAFT) [ 20,21 ] polymerization from the BaTiO 3 surface, our group also successfully prepared a series of core-shell structured nanocomposites with excellent dielectric properties. Thus, more and more attention has been paid to the development of new materials with the aforementioned nanostructured to realize the desirable dielectric properties in Flexible nanocomposites comprising of polymer and high-dielectric-constant (high-k ) ceramic nanoparticles are becoming increasingly attractive for dielectric and energy storage applications in modern electronic and electric industry. However, a huge challenge still remains. Namely, the increase of dielectric constant usually at the cost of signifi cant decrease of breakdown strength of the nanocomposites because of the electric fi eld distortion and concentration induced by the high-k fi ller. To address this long-standing problem, by using nano-Ag decorated core-shell polydopami...

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“…Because of their enhanced insulating properties, the dielectric properties of highly filled ceramic-polymer composites are also of interest. The investigations of Brandt et al [8] at test temperatures below the glass transition of the poly(methyl methacrylate) component revealed a strong influence of the ceramic component on the dielectric properties of the composite.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic and dielectric properties of composites of poly(vinyl butyral) and alumina particles with a high filling degree

Handge

Wolff

Abetz

et al. 2016

Polymer

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Filler-filler and filler-matrix interactions in polymer composites increase with filler concentration and strongly influence the mechanical and rheological properties of polymer composites. By means of the spouted bed spray granulation process polymer composites with an extremely high concentration of inorganic fillers can be prepared. In this work, the viscoelastic properties of highly filled composites of poly(vinyl butyral) (PVB) and alumina particles are studied in the glassy, entanglement and terminal flow regime of poly(vinyl butyral). Ceramic-polymer composites with a volume concentration of inorganic particles between 61 vol% and 77 vol% were prepared. Such large filler fractions imply a strong effect of filler-filler interactions on the viscoelastic properties of the composite. Dynamic-mechanical thermal analysis reveals that the composites are characterized by a predominantly elastic behaviour below and above the glass transition temperature of the polymer phase because of strongly pronounced filler-filler and polymer-filler interactions. A phenomenological equation is proposed in order to describe the reinforcement effect which implies an increase of storage modulus by a factor of up to four orders of magnitude. The results of frequency and strain sweeps in the oscillatory mode show that the polymer phase strongly influences the deformation of the contact network of inorganic particles. Differential scanning calorimetry and broadband dielectric spectroscopy indicate that the glass transition temperature of poly(vinyl butyral) does not significantly differ within experimental resolution for pristine PVB and the PVB phase in the composites.

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Dielectric behaviour and conductivity of high-filled BaTiO3–PMMA composites and the facile route of emulsion polymerization in synthesizing the same

Cited by 27 publications

References 23 publications

Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Viscoelastic and dielectric properties of composites of poly(vinyl butyral) and alumina particles with a high filling degree

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Dielectric behaviour and conductivity of high-filled BaTiO3–PMMA composites and the facile route of emulsion polymerization in synthesizing the same

Cited by 27 publications

References 23 publications

Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Poly(methyl methacrylate)-grafted ZnO nanocomposites with variable dielectric constants by UV light irradiation

Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO3 Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss

Viscoelastic and dielectric properties of composites of poly(vinyl butyral) and alumina particles with a high filling degree

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Strawberry‐like Core–Shell Ag@Polydopamine@BaTiO₃ Hybrid Nanoparticles for High‐k Polymer Nanocomposites with High Energy Density and Low Dielectric Loss