Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS

Li, Shengtao; Xie, Dong; Qu, Guanghao; Yang, Liuqing; Min, Daomin; Cheng, Yonghong

doi:10.1016/j.apsusc.2019.01.082

Cited by 50 publications

(47 citation statements)

References 41 publications

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“…The interfacial structure between the inorganic particles and polymer is affected by the type of nanoparticles [19], particle surface treatment [20], particle surface functionalised groups [12], and the polarity and flexibility of the polymers [21] etc. The molecules in the interface region were occupied by the nanoparticles surface grafted molecules and the matrix molecules.…”

Section: Hard/soft Interfacementioning

confidence: 99%

“…4. A new peak β occurred in PP/POSS1458 composite, which corresponded to shallower trap [12]. Interfacial physical defects and shallower traps in PP/POSS 1458 composite originate from incompatibility between functionalised groups and polymer matrix (worse hard/soft interface).…”

Section: Hard/soft Interfacementioning

confidence: 99%

“…Results of TSDC showed that the trap energy for small amount and large amount of nanofillers would change greatly [22, 26]. The correlation between traps and breakdown strength was analysed [12, 26–28]. Deep traps energy is positively related to the dc breakdown strength, as shown in Fig.…”

Section: Analysis Of Trap Modulated Carrier Energy and Electrical Bmentioning

confidence: 99%

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Understanding insulation failure of nanodielectrics: tailoring carrier energy

Xie

Liu

2020

High Voltage

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Owing to the formation of interface and new feature of which, the properties of nanodielectrics can be improved. ‘Hard/soft interface’ and its trap distribution can be tailored by functionalised groups. Molecular simulation results show that the interaction energy and electrostatic potential are larger for the soft interface, which indicates the greater bonding strength with the polymer matrix and electrostatic force on charge carriers. Charge transport simulation indicates that the accumulation of homo‐charges would form a reverse electric field and distort electric field distribution. The injection depth would be restricted at the vicinity of sample/electrodes due to the greater trapping effect of deep traps, thus weakening the distortion in the sample bulk, thereby decreasing carrier energy and delaying the formation of impact ionisation. Based on the accumulation of carrier energy Φ = Eeλ, the idea of suppressing electron free path and carrier energy to enhance the insulation breakdown is confirmed. The classified effects of nanofillers during dc breakdown and corona‐resistant are further understood from carrier energy. The introduced interfacial trap is effective in trapping carriers due to the low carrier energy under dc voltage, while ineffective in blocking the energetic charges during corona‐discharge, but nanoparticles exert blocking and scattering effect against the energetic charges.

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Section: Hard/soft Interfacementioning

confidence: 99%

Section: Hard/soft Interfacementioning

confidence: 99%

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Understanding insulation failure of nanodielectrics: tailoring carrier energy

Xie

Liu

2020

High Voltage

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“…Li, S.T., Jiang, B.Y. have analyzed the effect of interfacial compatibility and microstructure on the performance of polypropylene composites [45,46]. These researches showed that interface feature plays a dominant role in the properties of nanocomposites.…”

mentioning

confidence: 99%

“…Meanwhile, the interfacial structure of composites filled with treated nanomaterials is different from that of untreated ones [29,47,48]. But there are few reports on the direct analysis of interfacial characteristics of surface functionalization nanocomposites from atomic level.As a popular nanofiller, boron nitride sheets (BNNS) have been widely applied to improve the properties of EP [6,[39][40][41][42][43][44][45][46][47][48][49][50][51]. Consequently, the BNNS/EP composites are adopted to investigate the interfacial characteristics in this work.…”

mentioning

confidence: 99%

Interfacial Characteristics of Boron Nitride Nanosheet/Epoxy Resin Nanocomposites: A Molecular Dynamics Simulation

Chen

Zhu

et al. 2019

Applied Sciences

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The interface between nanofillers and matrix plays a key role in determining the properties of nanocomposites, but the interfacial characteristics of nanocomposites such as molecular structure and interaction strength are not fully understood yet. In this work, the interfacial features of a typical nanocomposite, namely epoxy resin (EP) filled with boron nitride nanosheet (BNNS) are investigated by utilizing molecular dynamics simulation, and the effect of surface functionalization is analyzed. The radial distribution density (RDD) and interfacial binding energy (IBE) are used to explore the structure and bonding strength of nanocomposites interface. Besides, the interface compatibility and molecular chain mobility (MCM) of BNNS/EP nanocomposites are analyzed by cohesive energy density (CED), free volume fraction (FFV), and radial mean square displacement (RMSD). The results indicate that the interface region of BNNS/EP is composed of three regions including compact region, buffer region, and normal region. The structure at the interfacial region of nanocomposite is more compact, and the chain mobility is significantly lower than that of the EP away from the interface. Moreover, the interfacial interaction strength and compatibility increase with the functional density of BNNS functionalized by CH 3 -(CH 2 ) 4 -O-radicals. These results adequately illustrate interfacial characteristics of nanocomposites from atomic level. Some experiments have been performed to explore the interfacial interaction of nanocomposites [21][22][23][24]. The interfacial properties of nanocomposites such as the chain movement, density, and compatibility can be characterized by Raman spectroscopy, atomic force microscopy, and in situ transmission electron microscopy, which showed that the interface feature has a dominant effect on the properties of composites [25][26][27][28]. The effect of interface characteristics on mechanical and physical properties of CNTs nanocomposites are investigated by measuring its surface microstructures, energy-dispersive spectroscopy, and fracture toughness, which pointed out that improving interfacial properties was a green and promising approach toward preparing high-performance composites [29][30][31]. Q. Li and J. L. He employed a modified Kelvin probe force microscopy method to detect the local polarization property at the matrix/particle interface in ferroelectric nanocomposites, and the results illuminated that the abnormal performance of ferroelectric nanocomposites stems from the interfacial region [32]. To explain these experimental results, several interface theories and models have been proposed to describe the interfacial interaction in nanocomposites [33]. Lewis [34] and Tsagaropoulos [35] considered that the interfacial region could be split into two layers: a tightly bound layer (which does not contribute to the glass transition), and a loosely bound layer (which may exhibit its own glass transition unique from the rest of the polymer), which also indicated that the interfacial interactions...

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Scalable Polyimide‐Organosilicate Hybrid Films for High‐Temperature Capacitive Energy Storage

Dong

Qiu

et al. 2023

Advanced Materials

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well drilling. [1][2][3] Nowadays, dielectric materials with excellent high-temperature capacitive properties are in great demand because of the heat inevitably generated by compact high-power electronic systems. [4][5][6][7] For example, the operating temperature of capacitors is 140-150 °C in green-energy vehicle inverters and reaches 200 °C in electrified aircraft. Biaxially oriented polypropylene (BOPP), the mainstream commercial polymer dielectrics, has discharged energy densities (U e ) <4.0 J cm −3 and a maximum operating temperature below 105 °C. [5,8,9] Therefore, developing dielectric polymers with high working temperatures and large energy storage densities is of critical importance.The current high glass-transitiontemperature (T g ) dielectric polymers, including polyimide (PI), polyetherimide (PEI), polyetheretherketone (PEEK), and fluorene polyester (FPE), usually exhibit low breakdown strength (E b ) and poor capacitive performance at >150 °C because of an exponential increase in conduction loss with the applied field and temperature. [5,10,11] There are two types of conduction mechanisms in dielectrics, i.e., electrode-limited and bulk-limited conduction mechanisms. [6,[12][13][14][15][16][17] Unlike the electrode-limited conduction mechanism that depends on the electrode-dielectric interface, the bulk-limited conduction mechanism is determined by the electrical characteristics High-temperature polymer dielectrics have broad application prospects in next-generation microelectronics and electrical power systems. However, the capacitive energy densities of dielectric polymers at elevated temperatures are severely limited by carrier excitation and transport. Herein, a molecular engineering strategy is presented to regulate the bulk-limited conduction in the polymer by bonding amino polyhedral oligomeric silsesquioxane (NH 2 -POSS) with the chain ends of polyimide (PI). Experimental studies and density functional theory (DFT) calculations demonstrate that the terminal group NH 2 -POSS with a wide-bandgap of E g ≈ 6.6 eV increases the band energy levels of the PI and induces the formation of local deep traps in the hybrid films, which significantly restrains carrier transport. At 200 °C, the hybrid film exhibits concurrently an ultrahigh discharged energy density of 3.45 J cm −3 and a high gravimetric energy density of 2.74 J g −1 , with the charge-discharge efficiency >90%, far exceeding those achieved in the dielectric polymers and nearly all other polymer nanocomposites. Moreover, the NH 2 -POSS terminated PI film exhibits excellent charge-discharge cyclability (>50000) and power density (0.39 MW cm −3 ) at 200 °C, making it a promising candidate for high-temperature high-energy-density capacitors. This work represents a novel strategy to scalable polymer dielectrics with superior capacitive performance operating in harsh environments.

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Tailoring interfacial compatibility and electrical breakdown properties in polypropylene based composites by surface functionalized POSS

Cited by 50 publications

References 41 publications

Understanding insulation failure of nanodielectrics: tailoring carrier energy

Understanding insulation failure of nanodielectrics: tailoring carrier energy

Interfacial Characteristics of Boron Nitride Nanosheet/Epoxy Resin Nanocomposites: A Molecular Dynamics Simulation

Scalable Polyimide‐Organosilicate Hybrid Films for High‐Temperature Capacitive Energy Storage

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