Dynamics, thermal behaviour and elastic properties of thin films of poly(vinyl alcohol) nanocomposites

Bershteĭn, V. A.; Gun'ko, V.М.; Egorova, L. M.; Wang, Zhaowei; Illsley, Matthew; Воронин, Е. Ф.; Prikhod’ko, G. P.; Yakushev, P. N.; Лебода, Р.; Skubiszewska–Zięba, J.; Mikhalovsky, Sergey V.

doi:10.1039/c1ra00535a

Cited by 14 publications

(15 citation statements)

References 55 publications

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“…PVA showed a broad peak at 2 θ = 19.4°, which became sharp with increased intensity upon incorporation of GO. This increase in the crystallinity of PVA was attributed to the exfoliation and good dispersion of GO into nanosheets that acted as a nucleating agent and ordered the PVA chain movement by a restriction effect . A similar phenomenon was observed by Bao et al .…”

Section: Resultssupporting

confidence: 69%

Synergistic strengthening of composite films by crosslinking graphene oxide reinforcement and poly(vinyl alcohol) with dicarboxylic acids

et al. 2017

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High-strength plastic materials with excellent biodegradability, non-toxicity and economically wide availability are in high demand. Herein, we demonstrate graphene oxide (GO) composite of poly(vinyl alcohol) (PVA) as a potential bioplastic material by chemical crosslinking. For a potential bioplastic material, PVA has to be addressed for its high water absorbing capacity along with improvement in tensile strength and thermal stability. These issues were addressed by enhancing the interfacial binding between PVA and GO, covalent bonds between the two being introduced by crosslinking with dicarboxylic acids, namely succinic acid (SuA) and adipic acid (AdA). Crosslinking of neat PVA with dicarboxylic acids also resulted in enhanced swelling resistance and thermal stability. The greatest improvement in tensile strength and swelling resistance was observed for a GO crosslinked with diacids due to the synergistic effect of reinforcement and crosslinking. Improvements of 225 and 234% in the tensile strength of PVA (31.19 MPa) were observed for 5% GO-PVA samples crosslinked with 6.25 mmol AdA and 7.5 mmol SuA, respectively. For the same samples, water uptake was 44 and 29%, respectively, compared to the non-crosslinked PVA (359%). Exfoliation of graphiteAn amount of 5 g of graphite was added to a solution of 15 mL of HNO 3 and 5 g of KMnO 4 to form a paste. At a time, a small amount of approx. 100 mg of this paste was kept in a Borosil glass Petri dish and exfoliated using an LG microwave system (750 W, 230 V, 50 Hz) for 1 min. The process was repeated with the remaining paste. GO was prepared with an improved synthesis method. 77 Preparation of GO-PVA composite filmsAn amount of 2.5 g of PVA was dissolved in 75 mL of deionized (DI) water at 90 ∘ C for 2 h. The solution was cooled to room temperature. The required amount of GO suspension was added to the PVA solution and was then ultrasonicated for 10 min. The GO-PVA films were cast in 140 mm Petri dishes and dried at 45 ∘ C until the weight was equilibrated. Composites of 1, 2, 5 and 10% GO with respect to PVA were prepared. Crosslinking of PVA films with diacidsAn amount of 2.5 g of PVA was dissolved in 75 mL of DI water at 90 ∘ C for 2 h. The reaction mixture was brought to 100 ∘ C and the wileyonlinelibrary.com/journal/pi Synergistic effect of reinforcement and crosslinking After optimization of GO and crosslinker concentrations, 5% GO-PVA was crosslinked with 6.25 mmol AdA and 7.5 mmol SuA

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Section: Resultssupporting

confidence: 69%

Synergistic strengthening of composite films by crosslinking graphene oxide reinforcement and poly(vinyl alcohol) with dicarboxylic acids

et al. 2017

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“…Similar results has been reported by Hu et al Due to the lower decomposition temperature of GO sheets compared with AcAc-PVA, physical barrier effect which slows down the diffusion of pyrolysis products could be ignored. 43,44,46,54,55,57,58 Comparatively, in the case of AcAc-PVA/rGO system, the thermal stability of the nanocomposites was improved to a certain extent. Physical barrier effect of graphene was considered as the main reason for the improved thermal stability.…”

Section: Thermal Propertiesmentioning

confidence: 96%

“…It could be assumed that the fully exfoliated and well-dispersed graphene nanosheets act as nucleating agents, and thus the crystallinity of the composites was improved. 54,46 The increased crystallinity is probably due to the efficient restricting effect from graphene which ordered the PVA chain arrangement. In contrast, significant changes in the crystalline parameters have been observed in PVA/rGO composites through esterification of GO and PVA, where an almost amorphous material was obtained for 10 wt% of filler.…”

Section: Structure and Morphologymentioning

confidence: 99%

“…Applications in various fields including hydrogel, [33][34][35] ultrathin film, 36,37 nanofiber, 38,39 and electrical conductive material 40,41 have been discussed and enhancements in various properties are reported. 38,39,[42][43][44][45][46][47][48][49][50][51] Moreover, detailed mechanism of the enhancement of nanocomposites has been investigated. [52][53][54] The preparation of PVA/graphene nanocomposites can be roughly summarized as two ways: (1) facial aqueous blending with solvent evaporation, [55][56][57][58] coagulation 42 or vacuum filtration; 59,60 (2) covalently crosslinking of graphene sheets onto the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

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Crosslinked acetylacetonated poly(vinyl alcohol-co-vinyl acetate) nanocomposites with graphene oxide and reduced graphene oxide: a new way to modify the property of nanocomposites

Zhang

Tang

et al. 2013

RSC Adv.

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Many researches have been done on polymer/graphene nanocomposites due to their unique properties.How to better disperse graphene oxide (GO) and reduced graphene oxide (rGO) into nanocomposites has been widely studied because the dispersion of graphene into polymer matrix determines the property enhancements. In this study, acetoacetyl group was introduced into the poly(vinyl alcohol) (PVA) polymer chain, endowing PVA with the property of self-crosslinking. Significant increases in mechanical properties were shown in films prepared from crosslinked nanocomposites compared with those prepared from uncrosslinked. Covalent linkages between PVA chains which preferred better and firmer dispersion of nanofillers are responsible for the property improvement. A 300% improvement of tensile strength and a over 50 times increase of Young's modulus were observed relative to neat polymer with the addition of 2% GO. Considering excellent mechanical strength of graphene nano-layers, although better and more stable dispersion of GO was achieved in the crosslinking matrix, the maximum increase of mechanical property in the resultant nanocomposites was obtained with the addition of 1% rGO.

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“…[1][2][3] However, GT-based materials exhibit a distinct anisotropy in their thermal conductivity. [4][5][6][7][8] Specically, when GT is consolidated into blocks under a high compressive pressure, the thermal conductivity in the cross-plane direction is only in the range of 5-10 W m À1 K À1 because of low connectivity between adjacent layers and porous structures at the interlayer, 4,5 which greatly inhibit phonon mobility across the GT layers. [6][7][8] Furthermore, GT blocks show very low mechanical properties and almost no resilience due to weak van der Waals interactions between layers.…”

Section: Introductionmentioning

confidence: 99%

Enhanced cross-plane thermal conductivity and high resilience of three-dimensional hierarchical carbon nanocoil–graphite nanocomposites

Feng

et al. 2014

RSC Adv.

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Dynamics, thermal behaviour and elastic properties of thin films of poly(vinyl alcohol) nanocomposites

Cited by 14 publications

References 55 publications

Synergistic strengthening of composite films by crosslinking graphene oxide reinforcement and poly(vinyl alcohol) with dicarboxylic acids

Synergistic strengthening of composite films by crosslinking graphene oxide reinforcement and poly(vinyl alcohol) with dicarboxylic acids

Crosslinked acetylacetonated poly(vinyl alcohol-co-vinyl acetate) nanocomposites with graphene oxide and reduced graphene oxide: a new way to modify the property of nanocomposites

Enhanced cross-plane thermal conductivity and high resilience of three-dimensional hierarchical carbon nanocoil–graphite nanocomposites

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