Enhancing Thermal Conductivity of Polyvinylidene Fluoride Composites by Carbon Fiber: Length Effect of the Filler

Yi, Guoqing; Li, Jingliang; Henderson, Luke C.; Lei, Weiwei; Du, Lian; Zhao, Shuaifei

doi:10.3390/polym14214599

Cited by 19 publications

(12 citation statements)

References 53 publications

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“…The deconvoluted data determines the degree of crystallinity for each PVDF membrane. The relative crystallinity of each PVDF matrix in each membrane is determined based on the total enthalpy change of melting compared to the enthalpy of 100 % crystalline PVDF, which is 104.5 Jg −1 for the α phase and 103.4 Jg −1 for the β and γ phases [45,48] . Figure 3c and d displays the melting enthalpy and the degree of crystallinity for each membrane.…”

Section: Resultsmentioning

confidence: 99%

“…The relative crystallinity of each PVDF matrix in each membrane is determined based on the total enthalpy change of melting compared to the enthalpy of 100 % crystalline PVDF, which is 104.5 Jg À 1 for the α phase and 103.4 Jg À 1 for the β and γ phases. [45,48] Figure 3c and d displays the melting enthalpy and the degree of crystallinity for each membrane. The crystallization of the PVDF matrix occurs during the phase inversion coagulation process, which involves rapid cooling of the dope solution, resulting in an amorphous phase in the PVDF matrix.…”

Section: Thermal Analysis Of Membranesmentioning

confidence: 99%

“…Moreover, the high peak at 2θ 21.4°corresponds to (110)/(200), and the weak peak at 2θ 36.0°(200) represents the orthorhombic β phase of PVDF. [45]…”

Section: Polymorphic Structure Analysis Of Membranementioning

confidence: 99%

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Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Adi Nugroho,

Widiyanto,

Karimah

et al. 2024

ChemistrySelect

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The development of membrane technology is rapidly advancing, such as hydrophilic PVDF membranes, which provide anti‐fouling properties to the membrane. Therefore, this research innovates the development of hydrophilic PVDF membranes by incorporating lignin‐lignosulfonate fillers from OPEFBs in situ. This study successfully prepared hybrid PVDF membranes using the phase inversion method. ATR‐FTIR, XRD, and TGA/DSC analyses confirmed that the addition of 2 % filler promoted the formation of the β‐phase in PVDF, which was more dominant than with the addition of 4 % filler, especially in the PLs2 % membrane. SEM images of the membranes showed an asymmetric structure with finger‐like and sponge‐like pores. Interactive 3D surface imaging demonstrated increased pore potential peaks when lignosulfonate was added compared to lignin. The addition of 4 % filler had a hydrophilic‐hydrophobic repelling effect, increasing the porosity and water absorption of the PL4 % and PLs4 % membranes. Phase inversion membranes were relatively hydrophilic with a water contact angle of 61°, and adding filler reduced the membrane‘s contact angle by 8°. Based on the obtained results, it can be concluded that PVDF hybrid membranes with lignin and lignosulfonate fillers have significant potential for development in membrane technology applications that require hydrophilic membranes, such as wastewater treatment and seawater desalination.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysis Of Membranesmentioning

confidence: 99%

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Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Adi Nugroho,

Widiyanto,

Karimah

et al. 2024

ChemistrySelect

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“…The piezoelectric properties of PVDF mainly depend on the polar crystalline phase, especially the highest electric dipole moment, namely, the β Phase [ 67 ]. Therefore, in order to increase the β Phase content in materials, researchers have proposed a variety of methods, including thermal annealing [ 68 , 69 , 70 ], uniaxial stretching [ 71 ], the use of a high electrical field [ 72 , 73 ], electrospinning [ 74 , 75 , 76 ], surface charge approaches [ 77 , 78 ], curing processes [ 79 ], etc.…”

Section: Polymersmentioning

confidence: 99%

Progress in Microtopography Optimization of Polymers-Based Pressure/Strain Sensors

Sun

Wang

2023

Polymers

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Due to the wide application of wearable electronic devices in daily life, research into flexible electronics has become very attractive. Recently, various polymer-based sensors have emerged with great sensing performance and excellent extensibility. It is well known that different structural designs each confer their own unique, great impacts on the properties of materials. For polymer-based pressure/strain sensors, different structural designs determine different response-sensing mechanisms, thus showing their unique advantages and characteristics. This paper mainly focuses on polymer-based pressure-sensing materials applied in different microstructures and reviews their respective advantages. At the same time, polymer-based pressure sensors with different microstructures, including with respect to their working mechanisms, key parameters, and relevant operating ranges, are discussed in detail. According to the summary of its performance and mechanisms, different morphologies of microstructures can be designed for a sensor according to its performance characteristics and application scenario requirements, and the optimal structure can be adjusted by weighing and comparing sensor performances for the future. Finally, a conclusion and future perspectives are described.

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“…[1][2][3][4] Polymers have attracted increasing attention owing to their unique properties such as ease of processing, low weight, low cost, high chemical stability, and excellent mechanical properties [5][6][7] ; however, most polymers are thermal insulators, and their intrinsic TC is often <0.5 W/(mK). 8,9 To address this issue, various materials, such as metals (e.g., silver, 10 cupper 11 ), ceramic materials (e.g., boron nitride, [12][13][14] alumina, 15 alumina nitride 16 ), and carbonbased materials (e.g., carbon fiber (CF), [17][18][19][20] carbon nanotubes, 21,22 graphene, [23][24][25] graphite 26,27 ) have been incorporated into polymers to improve their TCs.…”

Section: Introductionmentioning

confidence: 99%

Modeling thermal conductivity of polymer/carbon fiber composites prepared by SCFNA method

He,

et al. 2023

Polymer Composites

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The spatial confining forced network assembly (SCFNA) has proven to be a promising method for greatly improving the thermal conductivity (TC) of polymer composites via transforming self‐assembled networks into force‐assembled networks in polymer matrices. Most of the models currently in use were derived to predict the TC of polymer composites with self‐assembled networks; however, these are not suitable for predicting the TC of polymer composites with force‐assembled networks. To address this issue, a TC prediction model for polymer/carbon fiber (CF) composites obtained using the SCFNA method was developed. First, a literature TC prediction model, built by abstracting a representative volume element (RVE) from a CF self‐assembled network, was utilized to determine the key parameters related to the CF distance. Thereafter, a modified RVE model was constructed based on the morphological characteristics of the force‐assembled network of CFs. In conjunction with the thermal resistance method, the TC values of the polymer composites were calculated and successfully validated using experimental data obtained by the SCFNA method. In this model, the compression ratio (ε) and a fitting coefficient f were applied to describe the relationship between self‐assembled and force‐assembled networks, and furthermore, the actual filler content in the force‐assembled network was calculated. It was found that as the ε value and filler content increased, f accordingly decreased; however, the calculated actual filler volume content in the force‐assembled network increased. These results possibly reflect the evolution of the CF microstructure obtained by the SCFNA method.Highlights Filler gaps in self‐assembled networks were studied using a literature model. The relationship between self‐assembled and force‐assembled networks was established. A thermal conductivity model of the force‐assembled network was established. The actual filler volume content in the force‐assembled network was calculated.

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Enhancing Thermal Conductivity of Polyvinylidene Fluoride Composites by Carbon Fiber: Length Effect of the Filler

Cited by 19 publications

References 53 publications

Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Progress in Microtopography Optimization of Polymers-Based Pressure/Strain Sensors

Modeling thermal conductivity of polymer/carbon fiber composites prepared by SCFNA method

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