Dependence of electromagnetic interference shielding ability of conductive polymer composite foams with hydrophobic properties on cellular structure

Zhao, Biao; Wang, Ruoming; Li, Yang; Ren, Yumei; Xiao, Li; Guo, Xiaoqin; Zhang, Rui; Park, Chul

doi:10.1039/d0tc00987c

Cited by 93 publications

(46 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since all polymers have electrical insulating properties, various electrically conductive fillers such as CB, exfoliated graphite, CNF or CNT are added to convert them to composites for antistatic and EMI shielding applications [ 268 , 269 , 270 , 271 , 272 , 273 , 274 ]. However, the presence of these fillers alone cannot induce electrical properties, and their uniform dispersion inside polymer matrices is one of the most promising methods to reduce the percolation threshold [ 275 ].…”

Section: Properties Of Rubber Foamsmentioning

confidence: 99%

Chemistry, Processing, Properties, and Applications of Rubber Foams

Rostami‐Tapeh‐Esmaeil

Vahidifar

Esmizadeh

et al. 2021

Polymers

View full text Add to dashboard Cite

With the ever-increasing development in science and technology, as well as social awareness, more requirements are imposed on the production and property of all materials, especially polymeric foams. In particular, rubber foams, compared to thermoplastic foams in general, have higher flexibility, resistance to abrasion, energy absorption capabilities, strength-to-weight ratio and tensile strength leading to their widespread use in several applications such as thermal insulation, energy absorption, pressure sensors, absorbents, etc. To control the rubber foams microstructure leading to excellent physical and mechanical properties, two types of parameters play important roles. The first category is related to formulation including the rubber (type and grade), as well as the type and content of accelerators, fillers, and foaming agents. The second category is associated to processing parameters such as the processing method (injection, extrusion, compression, etc.), as well as different conditions related to foaming (temperature, pressure and number of stage) and curing (temperature, time and precuring time). This review presents the different parameters involved and discusses their effect on the morphological, physical, and mechanical properties of rubber foams. Although several studies have been published on rubber foams, very few papers reviewed the subject and compared the results available. In this review, the most recent works on rubber foams have been collected to provide a general overview on different types of rubber foams from their preparation to their final application. Detailed information on formulation, curing and foaming chemistry, production methods, morphology, properties, and applications is presented and discussed.

show abstract

Section: Properties Of Rubber Foamsmentioning

confidence: 99%

Chemistry, Processing, Properties, and Applications of Rubber Foams

Rostami‐Tapeh‐Esmaeil

Vahidifar

Esmizadeh

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…The incident microwave energy dissipates within the material through the interactions of the EM field with the material’s molecular and electronic structure, which can convert the EM wave into thermal energy. In recent years, researchers have adopted two strategies to improve the microwave absorption performance of polymer composites: Using a combination of magnetic loss materials (such as ferrites) [ 40 ], magnetic metals (e.g., Fe, Co, Ni) [ 7 ], and dielectric loss carbon materials (such as graphene, CNT) [ 6 ]; Using new complex architectures such as multi-layered gradient structures [ 41 ] and foam-based materials [ 42 ]. …”

Section: Discussionmentioning

confidence: 99%

“…Using new complex architectures such as multi-layered gradient structures [ 41 ] and foam-based materials [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites

et al. 2021

View full text Add to dashboard Cite

Polyester nanocomposites reinforced with graphene nanoplatelets (GnPs) with two different lateral sizes are prepared by high shear mixing, followed by compression molding. The effects of the size and concentration of GnP, as well as of the processing method, on the electrical conductivity and electromagnetic interference (EMI) shielding behavior of these nanocomposites are experimentally investigated. The in-plane electrical conductivity of the nanocomposites with larger-size GnPs is approximately one order of magnitude higher than the cross-plane volume conductivity. According to the SEM images, the compression-induced alignments of GnPs is found to be responsible for this anisotropic behavior. The orientation of the small size GnPs in the composite is not influenced by the compression process as strongly, and consequently, the electrical conductivity of these nanocomposites exhibits only a slight anisotropy. The maximum EMI shielding effectiveness (SE) of 27 dB (reduction of 99.8% of the incident radiation) is achieved at 25 wt.% of the smaller-size GnP loading. Experimental results show that the EMI shielding mechanism of these composites has a strong dependency on the lateral dimension of GnPs. The non-aligned smaller-size GnPs are leveraged to obtain a relatively high absorption coefficient (≈40%). This absorption coefficient is superior to the existing single-filler bulk polymer composite with a similar thickness.

show abstract

“…Nowadays, only a few researches had reported PVDF/CNTs nanocomposite foams for EMI shielding applications. [ 20–22 ] Biao et al. fabricated PVDF/CNTs nanocomposite foams with outstanding EMI shielding property by a batch foaming way and investigated that the effect of the degree of foaming on their EMI shielding properties.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference Shielding Foams Based on Poly(vinylidene fluoride)/Carbon Nanotubes Composite

Dun

Luo

Wang

et al. 2021

Macro Materials & Eng

View full text Add to dashboard Cite

Polymeric electromagnetic interference (EMI) shielding foaming materials are found and applied in many frontier fields such as aerospace, transportation, and portable electronics. In this paper, a foam based on a composite system of poly(vinylidene fluoride) (PVDF) filled with carbon nanotubes (CNTs) is prepared for EMI shielding properties by using a solid‐state supercritical CO2 foaming strategy. PVDF is chosen as the matrix because of its excellent chemical resistance, thermal stability, and flame retardancy. The inclusion of CNTs renders this composite system enhanced complex viscosity and storage modulus by about two orders of magnitude. The electrical conductivity and EMI specific shielding effectiveness of obtained foams can be adjusted and reached the optimum value of 0.024 S m−1 and 29.1 dB cm3 g−1, respectively, originating from the gradual development of interconnected CNTs and conductive CNTs network as well as the introduction of cell structure in PVDF matrix. Interestingly, the reorientation of CNTs caused by foaming process results in electrical conductivity percolation threshold of PVDF/CNTs foams markedly decreases, in comparison to their unfoamed samples. This study provides a facile, efficient, green, and economic route for the preparation of EMI shielding foams consisted of fluorinated polymers and carbonaceous fillers.

show abstract

Dependence of electromagnetic interference shielding ability of conductive polymer composite foams with hydrophobic properties on cellular structure

Abstract: The introduction of a cellular structure in conductive polymer composites is supposed to be an effective way to ameliorate the electromagnetic interference (EMI) shielding properties.

Cited by 93 publications

References 70 publications

Chemistry, Processing, Properties, and Applications of Rubber Foams

Chemistry, Processing, Properties, and Applications of Rubber Foams

Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites

Electromagnetic Interference Shielding Foams Based on Poly(vinylidene fluoride)/Carbon Nanotubes Composite

Contact Info

Product

Resources

About