Synthesis and Property of Polyurethane Acrylates Modified Graphene Oxide

2016 ◽  
Vol 703 ◽  
pp. 273-277 ◽  
Author(s):  
Hong Bo Liu ◽  
Wu Ying Zhang ◽  
Feng Lin
Keyword(s):  
Graphene Oxide ◽  
Raman Spectra ◽  
Dimethyl Formamide ◽  
Hydroxyl Groups ◽  
Graphene Oxides ◽  
Ultrasonic Dispersion ◽  
Modified Graphene Oxide ◽  
Infrared Spectrometer ◽  
Modified Graphene ◽  
Scanning Electron

The graphene oxides were synthesized form graphite by ultrasonic dispersion in water, N-methylpyrrolidone (NMP), N,N-dimethyl-formamide (DMF), acetone and dimethylbenzene, and the polyurethane acrylates containing the reactive NCO (PACN) were prepared. Then the polyurethane acrylates modified graphene oxide synthesized by ultrasonic dispersion in N-methylpyrrolidone (NMP), N,N-dimethyl-formamide (DMF), acetone were prepared by NCO of PACN reacting with the hydroxyl groups of the graphene oxides. The polyurethane acrylates modified graphene oxide was characterized by Fourier transform infrared spectrometer (FTIR), scanning electron microscope (SEM) and Raman spectra. The FTIR spectra showed that the NCO of PACN reacted with the hydroxyl groups of graphene oxide synthesized by ultrasonic dispersion. The measurement of SEM and Raman spectra showed that the polyurethane acrylates modification didn't change the structure and surface morphology of graphene oxide.

Preparation, characterization, and chemical-induced hydrophobicity of thermostable amine-modified graphene oxide

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 105393-105399 ◽  
Author(s):  
Jing Wang ◽  
Hong-Zhang Geng ◽  
Zhi-Jia Luo ◽  
Songting Zhang ◽  
Jinqiu Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Small Molecule ◽  
Contact Angles ◽  
Oxide Surfaces ◽  
Graphene Oxides ◽  
Excellent Thermal Stability ◽  
Modified Graphene Oxide ◽  
Modified Graphene

A small molecule was grafted onto the graphene oxide surfaces using two different approaches and the obtained amine-modified graphene oxides have excellent thermal stability and significantly enhanced water/air contact angles.

Poly(ethylene imine)-modified graphene oxide with improved colloidal stability and its adsorption of methyl orange

2014 ◽  
Vol 70 (5) ◽  
pp. 851-857 ◽  
Author(s):  
Hongxi Liu ◽  
Ting Wu ◽  
Zhimin Wu ◽  
Yong Zhang ◽  
Keqin Xuan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Orange ◽  
Adsorption Capacity ◽  
Colloidal Stability ◽  
Ethylene Imine ◽  
Chemically Modified ◽  
Modified Graphene Oxide ◽  
Infrared Spectrometer ◽  
Poly Ethylene ◽  
Modified Graphene

Graphene oxide (GO) was chemically modified with poly(ethylene imine) (PEI) to improve its colloidal stability and was investigated as a potential adsorbent for the removal of methyl orange (MO). The synthesis of PEI-GO was verified with a Fourier transform infrared spectrometer and thermogravimetric analysis. A series of adsorption experiments were carried out to investigate the adsorption capacity of PEI-GO. Adsorption kinetics and thermodynamics studies were performed, and the thermodynamic parameters were calculated. The results showed that PEI could improve the colloidal stability of GO in aqueous solution, and the obtained PEI-GO showed a macroscopically homogeneous dispersion after more than three months. After standing for 90 days, the Brunauer–Emmett–Teller specific surface area of GO decreased from 353 to 214 m2 · g−1, while that of PEI-GO remained almost unchanged (from 432 to 413 m2 · g−1). The PEI-GO exhibited significantly faster kinetic and higher adsorption capacity for MO than GO. Moreover, PEI-GO had a good adsorption capacity in the acidic range, and the highest adsorption of MO occurred at pH = 6.0. The adsorption of MO on PEI-GO was an endothermic, spontaneous and physisorption process.

scholarly journals Preparation and Properties of Polyvinylidene Fluoride Nanocomposited Membranes based on Poly(N-Isopropylacrylamide) Modified Graphene Oxide Nanosheets

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 473 ◽  
Author(s):  
Xiangli Meng ◽  
Yuan Ji ◽  
Genhua Yu ◽  
Yujia Zhai
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Phase Inversion ◽  
Doping Amount ◽  
Water Contact ◽  
Modified Graphene Oxide ◽  
Modified Graphene ◽  
Scanning Electron

The nanomaterial of graphene oxide grafting poly (N-isopropylacrylamide) (GO-g-PNIPAAm) was synthesized and PVDF/GO-g-PNIPAAm blended membranes were fabricated by wet phase inversion. In this work, a hydrophilic nanomaterial GO-g-PNIPAAm with poly(N-isopropylacrylamide) (PNIPAAm) grafted on GO, was synthesized by the atom transfer radical polymerization (ATRP) method. The resulting nanomaterial was confirmed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectrum, and X-ray photoelectron spectroscopy (XPS) analysis. The synthesized GO-g-PNIPAAm was incorporated with polyvinylidene fluoride (PVDF) via phase inversion, and investigated for its temperature sensitivity, porosity, contact angle, scanning electron microscopy, and permeate properties. The water contact angle measurements confirmed that GO-g-PNIPAAm nanomaterial-endowed PVDF membranes with better hydrophilicity and thermo-responsive properties compared with those of the pristine PVDF membranes. Bovine serum albumin (BSA) adsorption experiments suggested that excellent antifouling properties of membranes were acquired after adding GO-g-PNIPAAm. The modified membranes showed good performance when the doping amount of GO-g-PNIPAAm was 0.2 wt %.

Comparison and Characterization of Two Preparation Methods of Graphene Oxide

2014 ◽  
Vol 989-994 ◽  
pp. 125-129
Author(s):  
Hong Bo Liu ◽  
Wu Ying Zhang ◽  
Feng Lin ◽  
Hong Da Cao
Keyword(s):  
Thermal Expansion ◽  
Graphene Oxide ◽  
Functional Groups ◽  
X Ray Diffraction ◽  
Graphene Oxides ◽  
Ultrasonic Dispersion ◽  
Preparation Methods ◽  
Graphene Nanocomposites ◽  
Infrared Spectrometer ◽  
The Difference

The graphene oxides were prepared form graphite by thermal expansion and ultrasonic dispersion. The structure of graphene oxides was characterized by Fourier transform infrared spectrometer (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD) and Raman spectra. The difference of structure of graphene oxides by two preparation methods was compared. The measurement of FTIR and XRD showed the graphite was completely oxidized. The graphene oxide prepared by thermal expansion would lose large number of active functional groups, such as hydroxyl, carboxyl group, et al. However, the graphene oxide prepared by ultrasonic dispersion can retain these active functional groups. These active functional groups will be benefit to chemically modify the graphene oxides and prepare the polymer/graphene nanocomposites.

scholarly journals Design, synthesis, and catalytic performance of modified graphene oxide based on a cobalt complex as a heterogenous catalyst for the preparation of aminonaphthoquinone derivatives

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17108-17115
Author(s):  
Mahnaz Mirheidari ◽  
Javad Safaei-Ghomi
Keyword(s):  
Graphene Oxide ◽  
Cobalt Complex ◽  
Catalytic Performance ◽  
Silica Particles ◽  
Design Synthesis ◽  
Spherical Silica ◽  
Modified Graphene Oxide ◽  
Spherical Silica Particles ◽  
Heterogenous Catalyst ◽  
Modified Graphene

GO@f-SiO2@Co is a heterogenous catalyst composed of spherical silica particles grafted on the surface of graphene oxide with ethylenediamine ligands and coordination with Co(ii). We assessed the activity of the catalyst for the synthesis of aminonaphthoquinones.

Enhanced flame retardancy of polypropylene by melamine-modified graphene oxide

2015 ◽  
Vol 50 (16) ◽  
pp. 5389-5401 ◽  
Author(s):  
Bihe Yuan ◽  
Haibo Sheng ◽  
Xiaowei Mu ◽  
Lei Song ◽  
Qilong Tai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flame Retardancy ◽  
Modified Graphene Oxide ◽  
Modified Graphene
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