Mechanical reinforcement of graphene/poly(vinyl chloride) composites prepared by combining the in-situ suspension polymerization and melt-mixing methods

Wang, Han; Xie, Guiyuan; Fang, Minghe; Ying, Zhe; Tong, Yu; Zeng, Yongchao

doi:10.1016/j.compositesb.2017.01.053

Cited by 64 publications

(30 citation statements)

References 36 publications

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“…This mechanical improvement was mainly attributed to uniform dispersion of GNP in the PVC matrix, and strong GNP‐PVC interactions. [ 39 ] As seen in Figure 10, for nanocomposites the elongation at break values decreased consistently up to a loading of 0.5 wt%. At 1.0 wt% GNP the tensile strength and elongation at break were almost the same with 0.5 wt% GNP content.…”

Section: Resultsmentioning

confidence: 91%

Mechanical, thermal, and micro‐ and nanostructural properties of polyvinyl chloride/graphene nanoplatelets nanocomposites

2020

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This article describes micro‐ and nanostructural, mechanical, and thermal properties of nanocomposites based on polyvinyl chloride (PVC) and graphene nanoplatelets (GNP). The primary objective of this study was to extend restricted application area of PVC due to its low thermal stability and limited mechanical properties. GNP‐filled PVC nanocomposites were prepared (0, 0.1, 0.3, 0.5, and 1.0 wt%) by colloidal blending method and characterized in detail. The highest value of the tensile strength 13.73 MPa (an increase of 58%) and the highest value of microhardness 83.42 MPa (an increase of 82%) were obtained with GNP loading content of 0.5 wt% compared neat PVC. The mechanical properties started to decrease at loading higher than 0.5 wt%; however, the thermal properties continued to increase. The differential scanning calorimetry and Fourier transform infrared analysis results of this nanocomposite confirmed that the increase in glass transition temperature from 34.99°C to 44.36°C and the decrease in the height of functional groups peaks proved to prevented segmental relaxation and intermolecular vibrations of PVC, respectively. Thermogravimetric analysis results were showed that the percentage of carbonaceous residue increased to 15.77% by increasing the GNP content from 0.1 to 0.5 wt%. As a result, the best GNP loading was at 0.5 wt% for PVC/GNP nanocomposites where mechanical and thermal properties of PVC/GNP were both enhanced.

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Section: Resultsmentioning

confidence: 91%

Mechanical, thermal, and micro‐ and nanostructural properties of polyvinyl chloride/graphene nanoplatelets nanocomposites

2020

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“…. With the increasing amount of nano‐silica in PEEK resin, the rapid improvement of ultimate tensile strength can be observed . The growth rate of ultimate tensile strength slows down when the addition of nano‐silica is >2.5 wt%.…”

Section: Resultsmentioning

confidence: 99%

Multiscale enhancement behavior of nano‐silica modified CF/PEEK composites prepared by wet powder impregnation

2018

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The mechanical performance of modified multiscale carbon fiber (CF) reinforced poly(ether-ether-ketone) (PEEK) composites is improved through wet powder impregnation. The complex PEEK suspension is prepared by mixing nano-silica and PEEK powders in water homogeneously. The CFs are pulled through the complex PEEK suspension, and the modified multiscale PEEK prepregs and composites are prepared by a series of drying and consolidation process. The increasing energy storage, decreasing tan d max and the area under the tan d curve in the dynamic mechanical tests indicate strong interface interactions of modified multiscale CF/PEEK composites. The interlaminar shear strength increases by 15.6% from 72.2 to 83.5 MPa for 2.5 wt% nano-silica addition, showing significant improvement in resisting the delamination damage. Besides, the same addition makes the flexural strength and modulus increase by 13.9 and 8.6%, respectively. The modified multiscale CF/PEEK composites exhibit higher flexural strength and modulus at elevated temperature than the pristine composites. Furthermore, the enhancement mechanisms for the modified multiscale CF/PEEK composites are proposed and illustrated, which contributes to future research on multiscale enhancement for conventional composites. POLYM. COMPOS., 00:000-000, 2018. FIG. 5. The tensile fracture surfaces of PEEK nanocomposites. (a) Without nano-silica, (b) 1 wt% nanosilica, (c) 5 wt% nano-silica, (d)10 wt% nano-silica. FIG. 6. The dynamic mechanical performance. (a) Storage modulus, (b) Loss modulus, (c) The damping term-tan d. [Color figure can be viewed at wileyonlinelibrary.com]

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“…For instance, the Halpin‐Tsai model which has been widely used to describe the elastic modulus of polymer composites indicates that the Young's modulus of GPNCs should increase with increasing the concentration of graphene, and it thus cannot explain the sudden modulus drops (Figure B) . In the previous literature, the sudden mechanical property drops are usually attributed to the agglomeration or aggregation of graphene, the decrease of polymer crosslink density, or the structural defects caused by graphene, but these mechanism models cannot exactly explain why and how these agglomeration, aggregation, crosslink density decrease and structure defects occur at that low concentration. Moreover, unexpectedly, we find that the surface modification of graphene has little influence on the sudden mechanical property drops (Figure F) although the surface modification usually promotes the dispersion of graphene and the mechanical reinforcements of GPNCs.…”

Section: Introductionmentioning

confidence: 98%

Studies on the mechanism for the sudden mechanical property drops of graphene/polymer nanocomposites

Zhang

Yue

et al. 2020

Polymers for Advanced Techs

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Graphene/polymer nanocomposites (GPNCs) have gained intense research interest in recent years. Graphene can improve the properties of the nanocomposites at low loadings, but usually causes sudden drops in the mechanical properties of the nanocomposites at similarly low loadings, risking the performance, reproducibility, and batch stability of the nanocomposites. This problem has been troubling the GPNCs field for years, but it is difficult to solve mainly because the mechanism of the sudden mechanical property drops has not been well documented yet. Here, we present a systematic study on this problem. At first, a statistical study was made to provide an overview of the sudden mechanical property drops. It was found that the sudden mechanical property drops were almost independent of the surface modification of graphene, and the in situ polymerization method sometimes leads to lower critical concentration than the solvent blending and melt blending methods. Then, we demonstrated a cutting‐off mechanism which unveiled that the formation of a continuous or semicontinuous network of graphene throughout the polymeric matrix was the main cause of the sudden mechanical property drops, and the low critical concentration of the sudden mechanical property drops was mainly due to the large aspect ratio of graphene. Finally, future research prospects were proposed. Overall, our work has provided new understandings and insights to the mechanical properties of GPNCs.

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Mechanical reinforcement of graphene/poly(vinyl chloride) composites prepared by combining the in-situ suspension polymerization and melt-mixing methods

Cited by 64 publications

References 36 publications

Mechanical, thermal, and micro‐ and nanostructural properties of polyvinyl chloride/graphene nanoplatelets nanocomposites

Mechanical, thermal, and micro‐ and nanostructural properties of polyvinyl chloride/graphene nanoplatelets nanocomposites

Multiscale enhancement behavior of nano‐silica modified CF/PEEK composites prepared by wet powder impregnation

Studies on the mechanism for the sudden mechanical property drops of graphene/polymer nanocomposites

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