Synergistic effect of polypyrrole and reduced graphene oxide on mechanical, electrical and thermal properties of epoxy adhesives

Aradhana, Ruchi; Mohanty, Smita; Nayak, Sanjay K.

doi:10.1016/j.polymer.2019.02.006

Cited by 37 publications

(27 citation statements)

References 38 publications

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“…However, at higher loadings, the filler particles easily get agglomerated within the matrix resulting in local stress concentration areas which ultimately reduces the tensile strength. [ 48, 49 ] E/P and E/TG nanocomposites at 3 wt% filler loading exhibited lower tensile strength compared to E/P@G nanocomposites (Table 2). The tensile strength increased in the following order: E/P3 (47.7 MPa) < E/TG3 (50.6 MPa) < E/P@G3 (78.2 MPa).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…[ 50 ] Similar trend has been reported with an enhancement of 6.4% in impact strength for epoxy nanocomposites containing 5 wt% polypyrrole and 0.5 wt% rGO. [ 48 ] An enhancement of 11% in unnotched impact strength has been noticed in epoxy nanocomposites containing rGO /silica hollow microspheres. [ 43 ] In case of higher filler loadings of P@G, the impact strength was found to diminish which probably may be due to agglomeration of fillers which can develop flaws and thereby result in lower energy absorption.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Polyaniline nanorod adsorbed on reduced graphene oxide nanosheet for enhanced dielectric, viscoelastic and thermal properties of epoxy nanocomposites

Kunju

Gopalakrishnan

2021

Polymer Engineering & Sci

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In this work, polyaniline nanorod adsorbed on reduced graphene oxide (P@G) hybrid filler was prepared via in situ polymerization of aniline monomer in the presence of reduced graphene oxide as template. Fourier transform infrared, X‐ray diffraction, field emission scanning electron microscopy, and high‐resolution transmission electron microscopy images revealed the formation of P@G hybrid. The P@G hybrid was dispersed in dichlorobenzene and then introduced into epoxy resin at different loadings. The epoxy nanocomposites containing 9 wt% P@G hybrids (E/P@G9) exhibited a maximum DC conductivity of 1.34 × 10−5 S/cm that is eight orders higher compared to pure epoxy. At 103 Hz, a dielectric constant (ε′) of 163 was attained for E/P@G9, nearly 34 times higher than pure epoxy. A percolation threshold of 4 vol% was observed for ε′. Dynamic mechanical studies showed that significant enhancement in storage modulus values were exhibited for 3 and 5 wt% of hybrids. The glass transition temperature showed a maximum shift of 10°C to higher temperatures at 3 wt% loading of P@G hybrids (E/P@G3). The tensile strength, Young's modulus, and impact strength of the E/P@G3 nanocomposites enhanced by 19.7, 72, and 12%, respectively. The thermal stability of the epoxy nanocomposites also enhanced with the addition of P@G hybrid.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Polyaniline nanorod adsorbed on reduced graphene oxide nanosheet for enhanced dielectric, viscoelastic and thermal properties of epoxy nanocomposites

Kunju

Gopalakrishnan

2021

Polymer Engineering & Sci

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“…El pico ancho que va desde 12.5° a 25° justifica la naturaleza amorfa del adhesivo. Esta característica es similar a la que presentan las resinas epóxicas y se debe a la dispersión por las moléculas del pegante, que se forman luego del proceso de curado [23].…”

Section: θ (Grados)unclassified

Características mecánicas y térmicas de un poliuretano elaborado a partir de aceite de higuerilla (ricinus communis) para la adhesión de elementos estructurales de guadua angustifoliakunth

Gordillo-Delgado¹,

Bedoya-Pérez²,

Delgado-Osorio³

2020

revuin

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En las últimas décadas se ha intensificado la búsqueda de materia prima proveniente de recursosrenovables para la producción de polímeros, elastómeros, resinas, espumas, etc., que disminuyan el uso industrial de compuestos petroquímicos. En este trabajo se usó el aceite extraído de la semilla de higuerilla (Ricinus communis) por su contenido de ácido ricinoleico (92,3 %), por su fácil producción y por no ser comestible; la síntesis del poliuretano adhesivo se hizo a través de reacciones de transesterificación y polimerización; con él se pegaron láminas de Guaduaangustifolia Kunth y se determinaron las características mecánicas de la estructura; se obtuvo que la resistencia a la compresión paralela a la fibra es de 43±3 (MPa), y la cortante paralela a la fibra es de 5,9±0,9 (MPa). La determinación de la relación molar adecuada y el seguimiento de la reacción durante la síntesis se hicieron con espectroscopía infrarroja con transformada de Fourier y la estructura del producto final se analizó con difracción de rayos X. A través de calorimetría diferencial de barrido se obtuvo la temperatura de transición vítrea del producto de -26.4 °C y se usó la técnica de relajación térmica para medir su calor específico, mientras que su difusividad térmica y el coeficiente de dilatación térmica se estimaron con la técnica fotoacústica.

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“…[33][34][35] Hence, the combined use of graphene and rubber hybrid fillers is promising for further optimization and balance of mechanical and electrical properties of epoxy. 36 However, until now, research on the mechanical and electrical properties of epoxy resin filled with graphenebased hybrid fillers is rarely studied. Furthermore, to determine unambiguously how graphene and other fillers influence the fracture behaviors of epoxy, it requires that the complicated interaction between the hybrid fillers on toughening epoxy should be clarified and understood.…”

Section: Introductionmentioning

confidence: 99%

“…After proper surface modification and processing, graphene and its derivatives can be well‐dispersed and exfoliated in a polymer matrix, 31,32 producing significant improvements in mechanical properties at relatively small graphene loadings (<1.0 wt%), even effectively increasing the toughness of brittle epoxies 33–35 . Hence, the combined use of graphene and rubber hybrid fillers is promising for further optimization and balance of mechanical and electrical properties of epoxy 36 . However, until now, research on the mechanical and electrical properties of epoxy resin filled with graphene‐based hybrid fillers is rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Graphene/nanorubber reinforced electrically conductive epoxy composites with enhanced toughness

Wang

Xue

Guo

et al. 2020

J of Applied Polymer Sci

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Graphene platelets (electrically conductive 2D filler) and rubber nanoparticles (0D soft filler) can work together to develop electrically conductive and toughened epoxy composite adhesives. In this study, complementing effect between graphene platelets (GnPs) and rubber nanoparticles (RnPs) within an epoxy matrix is reported. In the 3-phase composite adhesive, the 2D graphene platelets form global conductive network and rubber nanoparticles provide a viscoelastic phase inside the epoxy, both complementing each other to develop electrically conductive and toughened epoxy composite adhesives. Fracture toughness (K 1c) and critical strain energy release rate (G 1c) of the epoxy were augmented by 422% and 872%, respectively by adding 1 wt% RnPs and it recorded electrical percolation threshold at 0.78 vol% GnP. Also, the Young's modulus and strength of epoxy/1 wt% RnP composite were promoted from 1.57 to 2.32 GPa when 1 wt% GnP is added. Scanning electron microscopy analysis was conducted to investigate the toughening mechanism of epoxy/RnP/GnP and epoxy/GnP composites. Lap shear strength tests on epoxy composite adhesives confirm the reinforcement effect of GnPs and toughness effect of RnPs.

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Synergistic effect of polypyrrole and reduced graphene oxide on mechanical, electrical and thermal properties of epoxy adhesives

Cited by 37 publications

References 38 publications

Polyaniline nanorod adsorbed on reduced graphene oxide nanosheet for enhanced dielectric, viscoelastic and thermal properties of epoxy nanocomposites

Polyaniline nanorod adsorbed on reduced graphene oxide nanosheet for enhanced dielectric, viscoelastic and thermal properties of epoxy nanocomposites

Características mecánicas y térmicas de un poliuretano elaborado a partir de aceite de higuerilla (ricinus communis) para la adhesión de elementos estructurales de guadua angustifoliakunth

Graphene/nanorubber reinforced electrically conductive epoxy composites with enhanced toughness

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