Mechanical properties and simulation of nanographene/polyvinylidene fluoride composite films

Wu, Qiong; Xie, Dong-jian; Zhang, Yidu; Jia, Zhemin; Zhang, Hua-zhao

doi:10.1016/j.compositesb.2018.08.061

Cited by 20 publications

(9 citation statements)

References 33 publications

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“…Despite the similar cost of commercially available CNCs and CNFs (see supporting information Figures S1–S4), the use of CNFs as a dopant or reinforcing filler in PVDF is limited [33]. Improvement of mechanical properties has been reported for PVDF composites with CNCs [31], carbon nanofibers [34], carbon fibers [35], graphene [36], and graphene oxide-titania nanolayers [37]. When PVDF was doped with carbon nanofibers, 122% increase in yield strength and 88% increase in tensile modulus was observed for 4 wt % carbon nanofiber loading [34].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites

Barnes

Jefcoat

Alberts³

et al. 2019

Polymers

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Cellulose nanofibrils (CNFs) are high aspect ratio, natural nanomaterials with high mechanical strength-to-weight ratio and promising reinforcing dopants in polymer nanocomposites. In this study, we used CNFs and oxidized CNFs (TOCNFs), prepared by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation process, as reinforcing agents in poly(vinylidene fluoride) (PVDF). Using high-shear mixing and doctor blade casting, we prepared free-standing composite films loaded with up to 5 wt % cellulose nanofibrils. For our processing conditions, all CNF/PVDF and TOCNF/PVDF films remain in the same crystalline phase as neat PVDF. In the as-prepared composites, the addition of CNFs on average increases crystallinity, whereas TOCNFs reduces it. Further, addition of CNFs and TOCNFs influences properties such as surface wettability, as well as thermal and mechanical behaviors of the composites. When compared to neat PVDF, the thermal stability of the composites is reduced. With regards to bulk mechanical properties, addition of CNFs or TOCNFs, generally reduces the tensile properties of the composites. However, a small increase (~18%) in the tensile modulus was observed for the 1 wt % TOCNF/PVDF composite. Surface mechanical properties, obtained from nanoindentation, show that the composites have enhanced performance. For the 5 wt % CNF/PVDF composite, the reduced modulus and hardness increased by ~52% and ~22%, whereas for the 3 wt % TOCNF/PVDF sample, the increase was ~23% and ~25% respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites

Barnes

Jefcoat

Alberts³

et al. 2019

Polymers

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“…There is no obvious agglomeration, which means BNNS could strongly interact with the PVDF matrix and form a homogeneously dispersed structure 20 . As for the PVDF/PZT/BNNS ternary composite films, BNNS does not affect the distribution of PZT particles in the PVDF matrix while well dispersed and form a physical link between PZT particles for its 2D structure 22–23,29 …”

Section: Resultsmentioning

confidence: 99%

“…0–3 type PVDF/PZT piezoelectric composite films have well mechanical flexibility, easier material design, and lower cost by mass production 24–28 . However, there are two challenges that need to overcome, one is the severe aggregation of fillers, 29 the bad compatibility between the polymer matrix and fillers is the other. To solve these problems, the surface modification of ceramic particles is carried out 18,30 …”

Section: Introductionmentioning

confidence: 99%

Property enhancement in flexible poly(vinylidene fluoride)‐based piezoelectric films with large‐area preparation

Zhang

Sun

et al. 2021

J of Applied Polymer Sci

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Poly(vinylidene fluoride) (PVDF)‐based film exhibits high degrees of electromechanical coupling, widely applied as flexible piezoelectric sensors, soft robotics, energy harvesters, and actuators. In this article, five different types of PVDF‐based piezoelectric films were prepared by the extrusion‐casting process. The mechanical, dielectric, ferroelectric, piezoelectric, and electrically induced deformation properties of different films were studied. It is found that the addition of lead zirconate titanate (PZT) can improve the dielectric constant of piezoelectric films. PZT powders modified by titanate coupling reagent (UP‐105) can further improve the mechanical and electrical properties of composite films by improving the combination and dispersion of organic and inorganic phases. The addition of boron nitride nanosheets can effectively inhibit the generation of leak current, especially at high temperatures. The piezoelectric coefficients (d33) of composite films can reach up to 21pC/N, and its strain ratio is about 0.6% under the electric field intensity of 200 kV/mm.

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“…Computational modeling provides a powerful tool to gain insight into the electromechanical behaviors and guide the design of PVDFbased harvesters. Various authors conducted finite element studies on the displacement of PVDF cantilever and actuator beams against the clamped end, [46][47][48][49][50][51][52] but there are scarcely literatures reported on the displacement along the arc length of PVDF arrays or nanofibers. [53][54][55][56] However, several works reported the distributions of piezoelectric potential under mechanical loadings.…”

Section: Introductionmentioning

confidence: 99%

Computational modeling and theoretical analysis of polyvinylidene fluoride microarrays for hybrid piezo‐pyroelectric energy harvesting

Fadzallah,

Sabran,

Hasnan

et al. 2024

Polymers for Advanced Techs

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Poly(vinylidene fluoride) (PVDF) is a promising piezoelectric and pyroelectric material for energy harvesting applications. This paper investigates the electrical outputs of PVDF microarrays using both simulation studies and theoretical calculations. The finite element method in COMSOL Multiphysics® is utilized to model PVDF microarrays and simulate their responses under mechanical loading and temperature changes. Theoretical calculations are also performed to estimate the piezoelectric and pyroelectric voltage outputs using established mathematical formulas. A series of PVDF microarrays are modeled in two dimensions with defined geometry, materials, boundary conditions, and parametric sweeps of wind speed and temperature. The simulation results for electrical outputs show good agreement with the theoretical calculations, demonstrating the validity of both approaches. The maximum voltage outputs are on the order of 10−3 V for the range of wind speeds from 6.5 to 11 m/s and temperatures from 319.3 to 336.3 K. In addition, the mechanical and thermal sensitivities are quantified. This work provides a framework for design and optimization of PVDF‐based energy harvesters. The combined methodology enables characterization of the relationships between operational conditions, PVDF microarray properties, and electrical outputs.

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Mechanical properties and simulation of nanographene/polyvinylidene fluoride composite films

Cited by 20 publications

References 33 publications

Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites

Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites

Property enhancement in flexible poly(vinylidene fluoride)‐based piezoelectric films with large‐area preparation

Computational modeling and theoretical analysis of polyvinylidene fluoride microarrays for hybrid piezo‐pyroelectric energy harvesting

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