Overall improvement in dielectric and mechanical properties of porous graphene fluoroxide/polyimide nanocomposite films via bubble-stretching approach

Chen, Zhigeng; Liu, Shumei; Shi, Yan; Shu, Xiaoyan; Yuan, Yan; Huang, Haohao; Zhao, Jianqing

doi:10.1016/j.matdes.2016.12.082

Cited by 53 publications

(24 citation statements)

References 33 publications

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“…Wu [31] proposed a method named in-situ bubble stretching to promote the dispersion of fillers in matrix and improve the composites' properties without modifying the structure of the mixing device. This method has been used to prepare polymer-based composites such as HDPE/Nano-CaCO 3 [31], GFO/pPI [32], LDPE/MWCNTs [33], HDPE/nano-SiC [34], which verified that in-situ bubble stretching (ISBS) is an efficient and environmentally friendly method to realize uniform dispersion of the fillers. Furthermore, the feasibility of the synergy of ISBS and extensional deformation was also confirmed according to the research by Yang [33] and Yin [34].…”

Section: Introductionmentioning

confidence: 82%

In-Situ Bubble Stretching Assisted Melt Extrusion for the Preparation of HDPE/UHMWPE/CF Composites

Yin

Cheng

et al. 2019

Polymers

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In this work, a novel melt extrusion method under synergy of extensional deformation and in-situ bubble stretching (ISBS) and corresponding apparatus were reported. The structure and working principle were introduced in detail. Polymer composites composed of high density polyethylene (HDPE)/ultrahigh molecular weight polyethylene (UHMWPE)/carbon fiber (CF) were prepared by using this new method. Effects of CF and Azodicarbonamide (AC) contents on composites’ morphology, rheological, thermal, and mechanical properties were experimentally investigated. SEM results showed that the CFs dispersed evenly in the matrix when the AC content was relatively high. DSC results showed that co-crystallization of HDPE and UHMWPE occurred in the composites, and the Xc of the composites decreased with the addition of AC or under high CF loadings. TGA results showed that the thermostability of the composites increased markedly with increasing CF loading. Mechanical properties showed that tensile strength increased by 30% with 9 wt % CF and 0.6 wt % AC added. The results aforementioned indicate that the novel melt extrusion method is a green and effective way to prepare HDPE/UHMWPE/CF composites.

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Section: Introductionmentioning

confidence: 82%

In-Situ Bubble Stretching Assisted Melt Extrusion for the Preparation of HDPE/UHMWPE/CF Composites

Yin

Cheng

et al. 2019

Polymers

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“…Tg of GFO/pPI-2 is as high as 388 °C . The temperatures of 5% thermal weight loss (Td5%) of all GFO/pPI films are higher than 560°C [15]. The thermal stability of PI films can usually be improved by the addition of inorganic fillers.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Polyimide Nanocomposites and Its Application

Nirman¹

2018

IJRASET

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Polyimide is a polymer of imide monomers. Polyimide has properties like Thermal stability Good chemical resistance, Excellent mechanical properties, High tensile strength, Lightweight flexible, resistant to heat and chemicals. Polyimide is used in various application like EMI shielding, fuel cell, supercapicator, aerospace etc. Polyimide properties can be increased by adding filler like CNT and graphene. The syntheses of various polyimide nanocomposites including diamines and dianhydrides that have been used to make novel polyimides with unique properties, are reported in this review. Properties of polyimide like thermal properties, electrical conductivity, and mechanical properties by adding CNT and graphene is studied in this review. I.INTRODUCTION In this review Article, particular emphasis is given to the polyimide nanocomposite and its various application. Polyimides have been in mass production since 1955. With their high heat-resistance, polyimides enjoy diverse applications e.g. high temperature fuel cells, EMI shielding material and as supercapacitor material, and as separation membrane. Polyimide is also known as engineering plastic. In last years many work has been done by the scientists on polyimide. Mainly work was done on polyetherimide, polyamideimide, polyesterimide, etc. polyimide belongs to the class of high-temperature polymers with balanced chemical and mechanical properties in addition to superior film-forming properties. Mechanical properties ,electrical properties and thermal stability of polyimide can be improved by adding the filler. By adding the filler or forming of nanocomposites there is drastically change in the properties of polyimide can be noticed by many scientist in their research work . Fillers like CNT, graphene, were used to increase the properties of polyimide. Mainly CNT and graphene is used as filler because of their low loading level [1]. CNTs (Carbon nanotubes) are composed of graphene sheet rolled up. CNTs is of two types SWNT and MWNT. CNTs can be considered as ultimate carbon fibers due to ultra high strength (10 to 100 GPa) and modulus (~1.0 TPa) values alongwith exceptional electrical (104-106 S/cm) and thermal properties (3000-6000W/mK) [2]. The higher intrinsic conductivity and aspect ratio of CNTs (100-5000) compared to carbon black allows the formation of conductive composites at low loading of CNTs due to low percolation thresholds (minimum loading level at which a continuous network of conducting particles is formed) resulting in achievement of better electrical conductivity and electromagnetic response at the same loading level. Graphene is a nanoscale materials based on single/multi-layered 2-D graphene sheets have attracted much attention recently due to its unusual properties [3]. Though composite materials employing carbon-based materials are presently dominated by carbon nanotubes, the intrinsic bundling of carbon nanotubes, impurities from the catalysts and high costs have been hampering their application. It has been proposed that these prob...

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“…However, this approach complicated the preparation process, which was contrary to the simple and effective concept of the ISBS method. Afterwards, Chen used polyethylene glycol as an intercalator and a blowing agent for achieving dispersed graphite fluoroxide. It was the first time that the ISBS method had been applied to two‐dimensional nanofillers, not just zero‐dimensional nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous dispersion of multiwalled carbon nanotubes via in situ bubble stretching and synergistic cyclic volume stretching for conductive LDPE/MWCNTs nanocomposites

Yang

Tong

et al. 2019

Polymer Engineering & Sci

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Low-density polyethylene (LDPE)/multiwalled carbon nanotubes (MWCNTs) nanocomposites with different foaming agent (OBSH) contents were innovatively prepared via In Situ Bubble Stretching (ISBS) and synergistic cyclic volume stretching. The cyclic convergent and divergent flow makes the MWCNTs repeatedly subjected to bubble stretching, which is conducive to the efficient dispersion of MWCNTs in the matrix. The thermal weight loss of neat OBSH and nanocomposite were characterized by thermal gravimetric analyzer (TGA), which indicated that the OBSH in the nanocomposite had been completely decomposed into gas during the plasticizing transport process. The results of morphology showed that the moderate content of OBSH had better dispersion effect on MWCNTs. At optimal OBSH content, the OBSH could generate enough gas and larger bubbles per unit time to provide greater expansion forces to do much for the dispersion of MWCNTs. The dynamic mechanical analysis (DMA) was further carried out and also proved that the content of OSBH was an important factor for the dispersion of MWCNTs. Moreover, the relationship between the OBSH content and conductivity was discussed in details. The improvement in conductive properties of nanocomposites associated with the use of the method can be attributed to a more homogeneous dispersion of MWCNTs. POLYM. ENG.

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Overall improvement in dielectric and mechanical properties of porous graphene fluoroxide/polyimide nanocomposite films via bubble-stretching approach

Cited by 53 publications

References 33 publications

In-Situ Bubble Stretching Assisted Melt Extrusion for the Preparation of HDPE/UHMWPE/CF Composites

In-Situ Bubble Stretching Assisted Melt Extrusion for the Preparation of HDPE/UHMWPE/CF Composites

Polyimide Nanocomposites and Its Application

Homogeneous dispersion of multiwalled carbon nanotubes via in situ bubble stretching and synergistic cyclic volume stretching for conductive LDPE/MWCNTs nanocomposites

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