scholarly journals The Effect of Hexamethylene Diisocyanate-Modified Graphene Oxide as a Nanofiller Material on the Properties of Conductive Polyaniline

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1032 ◽  
Author(s):  
José Antonio Luceño Sánchez ◽  
Ana Maria Díez-Pascual ◽  
Rafael Peña Capilla ◽  
Pilar García Díaz
Keyword(s):  
Graphene Oxide ◽  
Flexible Electronics ◽  
Organic Solar Cells ◽  
High Performance ◽  
In Situ Polymerization ◽  
Low Cost ◽  
Hexamethylene Diisocyanate ◽  
Charge Transfer Complexes ◽  
Modified Graphene Oxide

Conducting polymers like polyaniline (PANI) have gained a lot of interest due to their outstanding electrical and optoelectronic properties combined with their low cost and easy synthesis. To further exploit the performance of PANI, carbon-based nanomaterials like graphene, graphene oxide (GO) and their derivatives can be incorporated in a PANI matrix. In this study, hexamethylene diisocyanate-modified GO (HDI-GO) nanosheets with two different functionalization degrees have been used as nanofillers to develop high-performance PANI/HDI-GO nanocomposites via in situ polymerization of aniline in the presence of HDI-GO followed by ultrasonication and solution casting. The influence of the HDI-GO concentration and functionalization degree on the nanocomposite properties has been examined by scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), tensile tests, zeta potential and four-point probe measurements. SEM analysis demonstrated a homogenous dispersion of the HDI-GO nanosheets that were coated by the matrix particles during the in situ polymerization. Raman spectra revealed the existence of very strong PANI-HDI-GO interactions via π-π stacking, H-bonding, and hydrophobic and electrostatic charge-transfer complexes. A steady enhancement in thermal stability and electrical conductivity was found with increasing nanofiller concentration, the improvements being higher with increasing HDI-GO functionalization level. The nanocomposites showed a very good combination of rigidity, strength, ductility and toughness, and the best equilibrium of properties was attained at 5 wt % HDI-GO. The method developed herein opens up a versatile route to prepare multifunctional graphene-based nanocomposites with conductive polymers for a broad range of applications including flexible electronics and organic solar cells.

scholarly journals Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High-Performance Flexible All-Solid-State Supercapacitors

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1546
Author(s):  
Yueqin Li ◽  
Zongbiao Xia ◽  
Qiang Gong ◽  
Xiaohui Liu ◽  
Yong Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexible Electronics ◽  
High Performance ◽  
In Situ Polymerization ◽  
Lithium Bromide ◽  
Three Dimensional ◽  
Weight Ratio ◽  
Free Standing ◽  
Symmetric Configuration

The cellulose/graphene oxide (GO) networks as the scaffold of free-standing aerogel electrodes are developed by using lithium bromide aqueous solution, as the solvent, to ensure the complete dissolution of cotton linter pulp and well dispersion/reduction of GO nanosheets. Polyaniline (PANI) nanoclusters are then coated onto cellulose/GO networks via in-situ polymerization of aniline monomers. By optimized weight ratio of GO and PANI, the ternary cellulose/GO3.5/PANI aerogel film exhibits well-defined three-dimensional porous structures and high conductivity of 1.15 S/cm, which contributes to its high areal specific capacitance of 1218 mF/cm2 at the current density of 1.0 mA/cm2. Utilizing this cellulose/GO3.5/PANI aerogel film as electrodes in a symmetric configuration supercapacitor can result in an outstanding energy density as high as 258.2 µWh/cm2 at a power density of 1201.4 µW/cm2. Moreover, the device can maintain nearly constant capacitance under different bending deformations, suggesting its promising applications in flexible electronics.

A novel 3D porous electrode of polyaniline and PEDOT:PSS coated SiNWs for low-cost and high-performance supercapacitors

2021 ◽  
Author(s):  
Xiaojuan Shen ◽  
Xuan Zhang ◽  
Tongfei Wang ◽  
Songjun Li ◽  
Zhaoqiang Li
Keyword(s):  
High Performance ◽  
Solution Method ◽  
In Situ Polymerization ◽  
Low Cost ◽  
Porous Electrode ◽  
Simple Solution ◽  
Porous Si ◽  
Supercapacitor Electrode

In this study, a novel 3D porous Si-based supercapacitor electrode was developed by the simple solution method, which involved firstly the in-situ polymerization of polyaniline particles (PANI) on the Si...

scholarly journals Grafting of Polypyrrole-3-carboxylic Acid to the Surface of Hexamethylene Diisocyanate-Functionalized Graphene Oxide

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1095 ◽  
Author(s):  
José Antonio Luceño-Sánchez ◽  
Ana Maria Díez-Pascual
Keyword(s):  
Graphene Oxide ◽  
Carboxylic Acid ◽  
Flexible Electronics ◽  
Mechanical Performance ◽  
Ester Group ◽  
Hexamethylene Diisocyanate ◽  
Acyl Chloride ◽  
Functionalized Graphene Oxide ◽  
Modified Graphene Oxide ◽  
Grafting Reactions

A polypyrrole-carboxylic acid derivative (PPy-COOH) was covalently anchored on the surface of hexamethylene diisocyanate (HDI)-modified graphene oxide (GO) following two different esterification approaches: activation of the carboxylic acids of the polymer by carbodiimide, and conversion of the carboxylic groups to acyl chloride. Microscopic observations revealed a decrease in HDI-GO layer thickness for the sample prepared via the first strategy, and the heterogeneous nature of the grafted samples. Infrared and Raman spectroscopies corroborated the grafting success, demonstrating the emergence of a peak associated with the ester group. The yield of the grafting reactions (31% and 42%) was roughly calculated from thermogravimetric analysis, and it was higher for the sample synthesized via formation of the acyl chloride-functionalized PPy. The grafted samples showed higher thermal stability (~30 and 40 °C in the second decomposition stage) and sheet resistance than PPy-COOH. They also exhibited superior stiffness and strength both at 25 and 100 °C, and the reinforcing efficiency was approximately maintained at high temperatures. Improved mechanical performance was attained for the sample with higher grafting yield. The developed method is a valuable approach to covalently attach conductive polymers onto graphenic nanomaterials for application in flexible electronics, fuel cells, solar cells, and supercapacitors.

Fabrication and characterization of in situ graphene oxide reinforced high-performance shape memory polymeric nanocomposites from vegetable oil

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27648-27658 ◽  
Author(s):  
Rakesh Das ◽  
Sovan Lal Banerjee ◽  
P. P. Kundu
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Linseed Oil ◽  
Polymeric Nanocomposites ◽  
Modified Graphene Oxide ◽  
Fabrication And Characterization ◽  
Surface Modified ◽  
Modified Graphene

Polymeric nanocomposites have been fabricated via in situ cationic polymerization of linseed oil in the presence of surface-modified graphene oxide (SGO).

scholarly journals Green Synthesis of Free Standing Cellulose/Graphene Oxide/Polyaniline Aerogel Electrode for High Performance Flexible All-solid-state Supercapacitors

2020 ◽  
Author(s):  
Yueqin Li ◽  
Zongbiao Xia ◽  
Qiang Gong ◽  
Xiaohui Liu ◽  
Yong Yang ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
High Performance ◽  
In Situ Polymerization ◽  
Lithium Bromide ◽  
Three Dimensional ◽  
Weight Ratio ◽  
Porous Structures ◽  
Free Standing ◽  
Symmetric Configuration

The cellulose/GO networks as the scaffold of free-standing aerogel electrodes are developed by using lithium bromide aqueous solution as the solvent to ensure the complete dissolution of cotton linter pulp and well dispersion/reduction of GO nanosheets. PANI nanoclusters are then coated onto cellulose/GO networks via in-situ polymerization of aniline monomers. By optimized weight ratio of GO and PANI, the ternary cellulose/GO3.5/PANI aerogel film exhibits well-defined three-dimensional porous structures and high conductivity of 1.15 S/cm that contributes to its high areal specific capacitance of 1218 mF/cm2 at the current density of 1.0 mA/cm2. Utilizing this cellulose/GO3.5/PANI aerogel film as electrodes in a symmetric configuration supercapacitor can result in an outstanding energy density as high as 258.2 μWh/cm2 at a power density of 1201.4 μW/cm2. Moreover, the device can maintain nearly constant capacitance under different bending deformations, suggesting its promising applications in flexible electronics.

High-performance supercapacitor based on graphene oxide through in-situ polymerization and co-precipitation method

2020 ◽  
Vol 829 ◽  
pp. 154536 ◽  
Author(s):  
Chengxiang Huang ◽  
Chenghao Ni ◽  
Lingze Yang ◽  
Tiantian Zhou ◽  
Chen Hao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
In Situ Polymerization ◽  
Precipitation Method ◽  
Co Precipitation

scholarly journals Influence of Graphene Oxide Contents on Mechanical Behavior of Polyurethane Composites Fabricated with Different Diisocyanates

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 444
Author(s):  
Nadia Akram ◽  
Muhammad Saeed ◽  
Muhammad Usman ◽  
Asim Mansha ◽  
Fozia Anjum ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Mechanical Behavior ◽  
In Situ Polymerization ◽  
Complex Modulus ◽  
Phase Segregation ◽  
Hexamethylene Diisocyanate ◽  
Polymerization Process ◽  
Gravimetric Analysis ◽  
Polyurethane Composites

The exceptional behavior of graphene has not yet been entirely implicit in the polymer matrix. To explore this fact in the present work, two series of Polyurethan (PU) composites were synthesized. The structural modification was observed by the use of two different diisocyanate of methylene diisocyanate (MDI) and hexamethylene diisocyanate (HMDI) in hydroxylterminated polybutadiene (HTPB) by using I,4 Butane diol (BD) as the chain extender. The variation in hard segment up to 25 (wt.%) in both series led to significant changes in the mechanical behavior of graphene oxide (GO) induced composites. Both series were prepared by an in situ polymerization process. Fourier transform infrared (FTIR) analysis showed a peak in the region of 1700 cm−1, which confirmed the conversion of the NCO group into urethane linkages. Thermal gravimetric analysis (TGA) revealed a thermal stability up to 450 °C @ 90% weight loss. The swelling behavior showed the optimum uptake of 30% of water and 40% of dimethyl sulfoxide (DMSO) with aliphatic diisocyanate. The values of storage modulus (E′), complex modulus (E*), and compliance complex (D*) were observed up to 7 MPa, 8 Mpa, and 0.7 MPa−1, respectively. The degree of entanglement (N) values were calculated from DMA and were found in the range of 1.7 × 10−4 (mol/m3). Phase segregation of PU was observed by scanning electron microscopy (SEM), elucidating the morphology of composites.

scholarly journals A Scalable Prototype by In Situ Polymerization of Biodegradables, Cross-Linked Molecular Mode of Vapor Transport, and Metal Ion Rejection for Solar-Driven Seawater Desalination

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1489
Author(s):  
Zhou Wei ◽  
Naila Arshad ◽  
Muhammad Sultan Irshad ◽  
Muhammad Idrees ◽  
Iftikhar Ahmed ◽  
...  
Keyword(s):  
Metal Ion ◽  
High Performance ◽  
In Situ Polymerization ◽  
Low Cost ◽  
Energy Resource ◽  
Single Step ◽  
Primary Metal ◽  
Technological Leadership ◽  
Global Threat

Water scarcity in mass populated areas has become a major global threat to the survival and sustainability of community life on earth, which needs the prompt attention of technological leadership. Solar evaporation has emerged as a renewable energy resource and a novel technique for clean water production and wastewater treatment. Indeed, mounting a scalable solar evaporator including high evaporation efficiency and thermal management remains a significant challenge. Herein, we demonstrate a self-floatable, ecofriendly polypyrrole/wood sponge-based (PPy@WS) steam generator. The low-cost and easy to fabricate evaporator system consists of a single-step in situ polymerization of a 2-D (two-dimensional) hydrophilic wood sponge abundantly available for commercialization. The as-prepared PPy@WS solar evaporator exhibits excellent wettability and is super hydrophilic (contact angle ∼ 0), salt-resistant, and has an excellent light absorption of ∼94% due to omnidirectional diffusion reflection in PPy Nanoparticles (NPs). The capacity of the PPy@WS evaporator to absorb broadband solar radiation and convert it into thermal energy has enabled it to achieve excellent surface temperature (38.6 °C). The accumulated heat can generate vapors at the rate of 1.62 kg·m−2·h−1 along with 93% photothermal conversion efficiency under one sun (1 kW·m−2). Moreover, the presented prototype possesses the capability to be installed directly without the use of any complex protocol to purify seawater or sewage with an efficient rejection ratio of primary metal ions present in seawater (approximately 100%). This simple fabrication process with renewable polymer resources and photothermal materials can serve as a practical model towards high-performance solar evaporation technology for water-stressed communities in remote areas.

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