Surface and mechanical properties of graphene–clay/polyimide composites and thin films

Longun, Jimmy; Walker, Gabriel; Iroh, Jude O.

doi:10.1016/j.carbon.2013.06.024

Cited by 27 publications

(15 citation statements)

References 38 publications

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“…The AFM images show that the surface of the neat CMC film is quite smooth with an average surface roughness of 16 nm, whereas the images of CMC@GOn show that the average roughness of nanocomposite films gradually increases with the increasing of GOn loadings, showing a maximum of 59 nm for high GOn loading (7 wt %). This behavior was also previously observed for polymer nanocomposite films based on graphene and clay . The relatively low values of average roughness observed for CMC@GOn films may be due to the good homogenous dispersion of nanosheets within the CMC matrix; additionally, no large aggregates were formed in resulting films.…”

Section: Resultsmentioning

confidence: 84%

Mechanically strong nanocomposite films based on highly filled carboxymethyl cellulose with graphene oxide

Achaby

Miri

Snik

et al. 2015

J of Applied Polymer Sci

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Biopolymer nanocomposite films were prepared by adding exfoliated graphene oxide nanosheets (GOn) into carboxymethyl cellulose (CMC) at low and high GOn loadings (0.4–7 wt %). As firstly evidenced by viscosity of film-forming solutions, microscopic observations and infrared spectroscopy measurements, it was found that the GOn form a three-dimensional network throughout strong interfacial interactions with CMC, confirming that the GOn were well dispersed within the CMC, even at high GOn content, owing to the presence of several multifunctional groups on both phases which ensured the high compatibility between them. The topography of as prepared films was characterized by atomic force microscopy measurements showing that the films have a smooth surface with a very low average roughness for all range of GOn contents. Furthermore, the thermal stability, glass transition temperature, and tensile properties of nanocomposite films were gradually increased with increasing of GOn contents. By adding 7 wt % GOn, 18% increases of thermal stability, 17% of glass transition temperature, 623% of Young's modulus, and 268% of tensile strength were achieved. This work produced structured CMC-based nanocomposite films containing low and high loadings of well-dispersed GOn. The high performances of these films can be expected to have potential in biomaterials or packaging materials applications

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Section: Resultsmentioning

confidence: 84%

Mechanically strong nanocomposite films based on highly filled carboxymethyl cellulose with graphene oxide

Achaby

Miri

Snik

et al. 2015

J of Applied Polymer Sci

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“…The falloff is usually attributed to nanosheet aggregation and has been observed before for both BN and graphene based composites. 7,27,37,45,46 We find that the maximum modulus observed in all cases was just over 1.5 GPa (figure 4A), only slightly above the value of 1.45 GPa for the asprepared polymer. We also measured the rate of increase of modulus, dY/dVf, as shown in figure 4B.…”

Section: Resultsmentioning

confidence: 88%

Enhancing the mechanical properties of BN nanosheet–polymer composites by uniaxial drawing

et al. 2014

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We have used liquid exfoliation of hexagonal Boron-Nitride (BN) to prepare composites of BN nanosheets of three different sizes in polyvinylchloride matrices. These composites show low levels of reinforcement, consistent with poor alignment of the nanosheets as-described by a modified version of Halpin-Tsai theory. However, drawing of the composites to 300% strain results in a considerable increase in mechanical properties with the maximum composite modulus and strength both ~3 higher than that of the pristine polymer. In addition, the rate of increase of modulus with BN volume fraction was up to 3-fold larger than for the unstrained composites. This is higher than can be explained by drawing-induced alignment using Halpin-Tsai theory. However, the data was consistent with a combination of alignment and strain-induced de-aggregation of BN multilayers.

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“…The glass transition temperature ( T g ) is defined as the peak temperature of tan δ‐T curve. The tan δ peak height reduces greatly with the increase of HSE content, which is due to increasing restriction to chain mobility and energy dissipation with increasing chain entanglement .…”

Section: Resultsmentioning

confidence: 99%

Preparation, microstructure, mechanical, and thermal properties of in situ polymerized polyimide/organically modified sericite mica composites

Zhang

Lai

et al. 2015

Polymer Composites

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In this work, sericite mica was initially modified with a multi-step procedure and the novel composites of polyimide (PI) with the organophilic sericite mica were subsequently synthesized via in situ polymerization technique. XRD patterns revealed d 002 -spacing of clay was expanded from 0.99 to 2.77 nm. TEM photographs indicated majority of the organoclay exhibited an exfoliated morphology structure in composites with 5 wt% filler loading. Several critical properties of composites such as thermal stability, mechanical property, and storage modulus were tremendously enhanced with the increasing organoclay loading. Especially, the glass transition temperature of composites with 7 wt% organoclay addition revealed a 72 C increment compared with pristine PI, indicating greater improvement than the reported literature values. POLYM. COMPOS.,

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Surface and mechanical properties of graphene–clay/polyimide composites and thin films

Cited by 27 publications

References 38 publications

Mechanically strong nanocomposite films based on highly filled carboxymethyl cellulose with graphene oxide

Mechanically strong nanocomposite films based on highly filled carboxymethyl cellulose with graphene oxide

Enhancing the mechanical properties of BN nanosheet–polymer composites by uniaxial drawing

Preparation, microstructure, mechanical, and thermal properties of in situ polymerized polyimide/organically modified sericite mica composites

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