دانلود رایگان مقاله لاتین شبکه رسانای ذرات شیشه از سایت الزویر
عنوان فارسی مقاله:
یک بینش جدید در تنوع رسانای الکتریکی و شبکه رسانای ذرات شیشه ای با پوشش نقره / مواد مرکب سیلیکون الاستومر تحت فشار کششی
عنوان انگلیسی مقاله:
A new insight on the variation of the electric conductivity and conductive network of silver-coated glass particles/silicone elastomer composites under tensile strain
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Conductive elastomeric composites (CECs) combine the good flexibility, high elasticity and sealability of elastomers as well as the excellent electrical conductivity of conductive fillers [1,2], and thus CECs have been widely used in industry such as electromagnetic interference (EMI) shielding, electrostatic charge dissipation, touch control switches and sensor [3e5]. As the content of conductive filler far exceeds the percolation threshold, the conductive network is fully formed and the conductivity of CECs is closer to that of the conductive filler. The commonly used metal powers such as silver (Ag) and copper (Cu), have high electrical conductivity, but they are quite expensive and have high densities. In recent years, much attention has been paid to reduce the percolation threshold of CECs and obtain high conductivity and mechanical properties simultaneously by the introduction of high aspect ratio conductive filler such as conductive carbon fiber (CF), carbon nanotubes (CNTs) and graphene [6e8]. Although CNTs and graphene theoretically have high conductivity, the electrical conductivity of the CECs is still not high due to structural defects and low purity of these carbon fillers. On the other hand, the nano-scale dispersion of these carbon nanofillers in elastomer matrix is quite difficult to be obtained on a large scale [9]. Compared with metal powers and conductive carbon fillers, metal-coated inorganic fillers such as silver coated-glass particles, silver coated-aluminum, and nickel-coated graphite etc., have the advantages of high electrical conductivity, low density and low cost, thus are widely used as conductive filler in EMI shielding materials [10]. CECs are subjected to tensile stress or compress stress during storage, installation and application, leading to the destruction and reconstruction of conductive network and thus inevitably affect the electrical conductivity of the composites. Therefore, in addition toobtaining high conductivity, the stability of electrical conductivity during deformation is the most important performance [11]. Many previous studies show that the conductivity of these CECs decreases with increasing the tensile strain. For example, it has been reported that the conductivity of carbon black (CB)/rubber composite decrease with the increase in tensile strain because of the rapid destruction of conductive path under deformation [12]. In addition, Sun et al. [13] found that the conductivity of nickel-coated graphite (NCG)/silicone rubber composites decrease and stability of conductivity become worse with the increase of tensile strain and cycles of tensile deformation. In our previous studies, we also [14] found that the conductivity and stability of conductivity of nickelcoated carbon fiber (NCF)/polymethylvinylsiloxane (PMVS) composites decrease with the increase in external strain. On the other hand, several microscopic characterization techniques such as Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM), were used to characterize the conductive filler network. However, the evolution of conductive network of CECs under tensile strain and the relationship between conductive network and conductivity is still not clear. Silicone elastomer has good flexibility, high elasticity, excellent resistance to high and low temperatures, low viscosity, and low hardness, and thus widely used as CECs matrix. Herein, we used methyl vinyl silicon rubber (PMVS) as matrix and silver-coated glass particles (SG) as conductive filler. We selected two filler contents (one just exceeded the percolation threshold and the other far exceeded the percolation threshold), and studied the effect of the SG content, the tensile strain and the stretch-recovery cycles on the conductivity and the stability of conductivity of the SG/PMVS composites. We aim to clarify the relationship between the conductivity and conductive filler network of SG/PMVS composites. We also aim to provide guidance for the preparation high performance CECs with excellent conductivity and stability of conductivity
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کلمات کلیدی:
Conductivity stability and its relationship with the ... - RSC Publishing pubs.rsc.org/-/content/articlehtml/2014/ra/c4ra03786c by N Ning - 2014 - Cited by 5 - Related articles Jul 14, 2014 - For example, silver-coated glass beads combined with silver-coated ... the conductive network, and thus affect the electrical conductivity of the ... conductive fillers (the volume ratio of NCF/NCG varies from 10/0, 7/3, 5/5, 3/7 to ... Three-dimensional highly conductive silver nanowires sponges based ... pubs.rsc.org/en/content/articlehtml/2017/ra/c6ra25260e by CH Zhu - 2017 - Cited by 1 - Related articles Dec 22, 2016 - The binary conductive network structure was constructed based on ... the dip-coating cycles, which can reach a highest electrical conductivity of 56.82 S cm−1. .... 4 (a) Resistance variation of cotton–AgNWs–PDMS conductor ... Conductivity stability and its relationship with the filler network ... pubs.rsc.org/en/content/articlepdf/2014/ra/c4ra03786c?page=search Jul 14, 2014 - tivity at low ller volume fraction.19–21 For example, silver-coated glass beads combined ... increase the electrical conductivity and conductivity stability at the same ... conductive ller network structure and conductivity/ conductivity ... NCF/NCG varies from 10/0, 7/3, 5/5, 3/7 to 0/10) by using homogenizer ... Sparrho | A new insight on the variation of the electric conductivity https://www.sparrho.com/...variation-of-the-electric-conductivity-and-conductive-netwo... Oct 3, 2016 - In this study, we introduced silver-coated glass particles (SG) into ... of the electric conductivity and conductive network of silver-coated glass ... Nanofibrous Silver-Coated Polymeric Scaffolds with Tunable Electrical ... www.mdpi.com/2079-4991/7/3/63/htm by A Memic - 2017 Mar 13, 2017 - The Ag coating formed an electrically conductive layer around the fibers and ... Such variations in the electrical conductivity were superior to the ... Relationship between Dispersion and Conductivity of Polymer ... pubs.acs.org/doi/abs/10.1021/jp305815r by Y Feng - 2012 - Cited by 12 - Related articles Oct 11, 2012 - A new insight on the variation of the electric conductivity and conductive network of silver-coated glass particles/silicone elastomer composites ...
