Preparation of poly(vinyl alcohol)-grafted graphene oxide/poly(vinyl alcohol) nanocomposites via in-situ low-temperature emulsion polymerization and their thermal and mechanical characterization

Zhang, Shengchang; Liu, Pengqing; Zhao, Xiangsen; Xu, Jianjun

doi:10.1016/j.apsusc.2016.11.094

Cited by 61 publications

(29 citation statements)

References 49 publications

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“…The HRTEM photomicrographs of the nanocomposites mostly provide the clear idea about the dispersion of nanofillers in the highly viscous polymer matrix. [ 23,24 ] The HRTEM photomicrographs of the GO and GO filled PVA nanocomposites with and without IL are shown in Figure 2 which gives ample information about the dispersion GO sheets in the developed nanocomposites. The agglomerated, intercalated, and exfoliated dispersion patterns of GO sheets are observed in the HRTEM photomicrographs.…”

Section: Resultsmentioning

confidence: 99%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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Fabrication of polymer nanocomposites with excellent dielectric properties in an environmentally friendly approach is a challenging job. Nanocomposites based on polyvinyl alcohol (PVA) and graphene oxide (GO) are fabricated using deionized water by solvent casting technique. The agglomerations, intercalation, and exfoliation pattern of dispersion of GO phase in the interface are observed in HRTEM and FESEM photomicrographs.1-Allyl-3-methyl imidazolium chloride (AMIC) as ionic liquid (IL) is incorporated for better dispersion and compatibility. The Fourier-transform infrared (FTIR) and Raman analysis confirms the establishment of hydrogen bonding and cation-π interaction between AMIC and GO platelets. The enhancement of the tensile results up to 2 wt% of GO loading ensures the reinforcing nature of GO. Further increase in tensile strength in IL contend systems ensure the bridging activity, which facilitates the stress transfer at the interface. The effect of GO loading, IL, and temperature on the dielectric properties, such as dielectric permittivity (ε 0), AC conductivity (σ ac), impedance (Z 0 and Z 00), and Nyquist plot are explored. The significant enhancement in ε 0 with the incorporation of GO loading level and IL in an external electric field is mostly due to the increase in polarizable dipoles and migration of electric charge carriers, which result the accumulation of charge particles with different relaxation time at the interface. The interfacial polarization phenomena become more frequent at higher temperature, which again results increase in ε 0. A remarkable increase in σ ac and reduction of Z 0 and Z 00 of the fabricated PVA/GO systems with an increase in GO loading level ensures the pronounced tunneling and hopping phenomenon at the interface. The diminished area obtained under the Nyquist plots with increase in GO loading level and temperature ensures about the decrease in bulk resistivity (R B) and increase in charge storing ability of the developed systems. The significant improvement in dielectric properties at higher temperature reveals the negative temperature coefficient behavior of resistance (NTC) of the developed systems.

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Section: Resultsmentioning

confidence: 99%

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

2020

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“…This behavior was reflected on the softening point of the material, the Tan (δ), which increased from ~120 °C to ~140 °C in the healed sample. The enhanced rigidity of the composite material after healing might be addressed to the presence of rGO, whose interfacial interactions with the PKFU macromolecules become more effective as also recently observed in similar samples containing MWCNTs [ 15 , 42 , 44 , 47 , 59 ].…”

Section: Resultsmentioning

confidence: 81%

Thermally Switchable Electrically Conductive Thermoset rGO/PK Self-Healing Composites

et al. 2021

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Among smart materials, self-healing is one of the most studied properties. A self-healing polymer can repair the cracks that occurred in the structure of the material. Polyketones, which are high-performance thermoplastic polymers, are a suitable material for a self-healing mechanism: a furanic pendant moiety can be introduced into the backbone and used as a diene for a temperature reversible Diels-Alder reaction with bismaleimide. The Diels-Alder adduct is formed at around 50 °C and broken at about 120 °C, giving an intrinsic, stimuli-responsive self-healing material triggered by temperature variations. Also, reduced graphene oxide (rGO) is added to the polymer matrix (1.6–7 wt%), giving a reversible OFF-ON electrically conductive polymer network. Remarkably, the electrical conductivity is activated when reaching temperatures higher than 100 °C, thus suggesting applications as electronic switches based on self-healing soft devices.

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“…Graphite is often chemically exfoliated to synthesize GO that is the oxygenated form of a monolayer graphene [3,4]. Owing to the strong mechanical strength, chemical functionalization capability and extremely large surface, GO shows potential applications in many fields such as optical nonlinearity [13], water purification [14], polymer composites [15], coating [16], lens [17], flexible rechargeable battery electrode [18], etc. GO exhibits good dispersion in water because its surface is rich in hydrophilic oxygen-containing groups such as epoxy, hydroxyl and carbonyl groups.…”

Section: Introductionmentioning

confidence: 99%

Clay–graphene oxide liquid crystals and their aerogels: synthesis, characterization and properties

Yang

et al. 2019

R. Soc. open sci.

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The dispersions containing two kinds of layered solids—graphene oxide (GO) and exfoliated montmorillonite (MMT) were mainly prepared, following which the binary aerogels were synthesized. The results indicate that the formation of liquid crystals (LCs) occurs at lower GO concentration and the birefringence becomes stronger when MMT is introduced into GO dispersion. Sol–gel transition forms in the binary suspensions with different mass fractions of MMT and GO. LCs with highly ordered alignment are observed in the gel and the fraction of LCs obviously increases with the increase in GO concentration. Moreover, the birefringence is observed in MMT–GO binary aerogels with the interconnected three-dimensional porous network, which is attributed to the ordered arrangement of MMT and GO nanosheets in pore walls. Among the aerogels with different MMT/GO ratios, the samples at the ratio of 10 : 1 show better adsorption capacity and removal percentage of cationic and anionic dyes.

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Preparation of poly(vinyl alcohol)-grafted graphene oxide/poly(vinyl alcohol) nanocomposites via in-situ low-temperature emulsion polymerization and their thermal and mechanical characterization

Cited by 61 publications

References 49 publications

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

Thermally Switchable Electrically Conductive Thermoset rGO/PK Self-Healing Composites

Clay–graphene oxide liquid crystals and their aerogels: synthesis, characterization and properties

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