Graphene oxide modification with graft polymers via nitroxide mediated radical polymerization

Garcia‐Valdez, Omar; Ledezma-Rodríguez, Raquel; Saldívar‐Guerra, Enrique; Yate, Luis; Moya, Sergio; Ziolo, Ronald F.

doi:10.1016/j.polymer.2014.03.042

Cited by 43 publications

(17 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The covalent bonds are strong, which prevents the escape of HD, and the repulsion between HD molecules is strong enough to suppress the aggregation of GO sheets during fabrication. Therefore, from the TEM image in Figure e, it is observed that GO‐ g ‐HD is also composed of thin flakes with irregular corrugation, similar to the morphology of GO . This observation indicates that the microstructure of GO is not destroyed during the covalent grafting process.…”

Section: Resultssupporting

confidence: 88%

“…Therefore,f rom the TEM image in Figure 5e,iti so bserved that GO-g-HD is also composed of thin flakes with irregular corrugation,s imilar to the morphology of GO. [37,46] This observation indicates that the microstructure of GO is not destroyed during the covalent grafting process.T he interconnected GO network enables as ignificant increasei nt he thermal conductivity of the composite due to high thermal conductivitya nd good dispersion of GO in HD. Figure 6s hows the DSC curves of HD,H D/GO,a nd GO-g-HD,a nd the thermographic data are listed in Table 1.…”

Section: Resultsmentioning

confidence: 77%

See 1 more Smart Citation

Preparation and Characterization of Graphene Oxide‐Grafted Hexadecanol Composite Phase‐Change Material for Thermal Energy Storage

Wang

Zhang

2017

Energy Tech

View full text Add to dashboard Cite

With the aim of improving the shape stability and recycling reliability of hexadecanol (HD), graphene oxide (GO)‐grafted hexadecanol (GO‐g‐HD) shape‐stabilized phase‐change material (SSPCM) with good thermochemical properties was prepared by oxidizing graphite powders to form GO, which was converted into the acyl chloride and finally condensed with HD. Various characterization techniques were employed to investigate the microstructure, thermal properties, thermal durability, and reliability of the composite. The results show that HD was embedded in the composite with a maximum mass fraction of 62.7 wt % through physical adsorption and covalent bonding. The grafted percentage and density of HD on ultrathin GO sheets are 36.5 wt % and 1.51 mmol g−1, respectively. The GO‐g‐HD SSPCM melts at 49.7 °C with a latent heat of 152.3 J g−1, and freezes at 45.4 °C with a phase‐change enthalpy of 129.9 J g−1. The thermal conductivity of GO‐g‐HD is measured as 0.519 W m−1 K−1, which is an improvement of 41.8 % compared with that of neat HD. Moreover, the as‐prepared composite also presents excellent chemical and thermal stability, excellent thermal durability, negligible variation in latent heats, and no changes in the phase‐change temperatures due to strong covalent bonds and interactions between the matrix and HD. Thus, GO‐g‐HD is a promising candidate for thermal energy storage in the future because of the very good latent heat, enhanced conductivity, and stability.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 77%

Preparation and Characterization of Graphene Oxide‐Grafted Hexadecanol Composite Phase‐Change Material for Thermal Energy Storage

Wang

Zhang

2017

Energy Tech

View full text Add to dashboard Cite

show abstract

“…The surface modification of GO by graft polymers of styrene and isoprene using the “grafting‐from” polymerization technique via nitroxide‐mediated polymerization (NMP) chemistry was reported earlier . Here, we report the modification of GO with well‐defined PS combining SG1‐based NMP and the “grafting‐to” approach, using procedures developed by our group, which were used to modify chitosan by NMP .…”

Section: Introductionmentioning

confidence: 86%

“…Grafting of GO with “controlled” polymer chains via CRP, either by grafting‐from or ‐to, is a powerful technique which offers the possibility of controlling the quantity and length of polymer chains that could be grafted to GO and provides a potentially broad latitude for the preparation of GO polymer nanocomposites . NMP has allowed for the precise synthesis of new (co)polymer‐based materials on several substrates, such as, biopolymers, and graphene oxide, mainly using the “grafting‐from” approach; chitosan and the present GO work are exceptions.…”

Section: Introductionmentioning

confidence: 99%

The “Grafting‐to” of Well‐Defined Polystyrene on Graphene Oxide via Nitroxide‐Mediated Polymerization

Garcia‐Valdez¹,

Ledezma-Rodríguez²,

Torres-Lubián³

et al. 2016

Macro Chemistry & Physics

Self Cite

View full text Add to dashboard Cite

The grafting of well‐defined polystyrene to graphene oxide (GO) using nitroxide‐mediated polymerization (NMP) is demonstrated by a two‐step reaction. In the first step, GO is functionalized with glycidyl methacrylate (GMA) to yield GO‐GMA. Polystyrene (PS), previously synthesized via SG1‐based NMP, is then grafted to GO‐GMA by a simple reaction between the SG1 end group and the GMA double bond to yield GO‐GMA‐g‐PS. 1H, heteronuclear single‐quantum correlation (HSQC), nuclear magnetic resonance (NMR), X‐ray photoelectron spectroscopy (XPS), Raman, Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and thermogravimetric analysis (TGA) are consistent with attachment of the GMA group to the GO surface and with polystyrene being grafted to the GO surface to form the GO‐GMA‐g‐PS nanocomposite (NC). GPC analysis shows a number‐average molecular weight of 3330 g mol−1 for the PS with molecular weight dispersity (Ð) of 1.13. Up to 28 mass% of PS has been introduced into the GO NC. The present “grafting‐to” methodology holds promise for the facile and clean synthesis of graphene oxide polymer NCs.

show abstract

“…32 Garcia-Valdez et al 45 modified the surface of GO via grafting polystyrene and polyisoprene, respectively. 33 The dispersibility of the modified GO was prominently enhanced. Despite great advance has been made in this field, there are still some drawbacks in these methods.…”

Section: Introductionmentioning

confidence: 98%

Biomimic modification of graphene oxide

Shi

Wang

et al. 2015

New J. Chem.

View full text Add to dashboard Cite

5Surface modification of graphene oxide has attracted increasing attention in recent years. In this article, a green, facile and efficient method was developed to modify graphene oxide with polymers via combination of mussel inspired chemistry and Michael addition reaction. Graphite powder was first oxidated and exfoliated into single layer of slices through a modified Hummers method, then coated with polydopamine, which was formed via self polymerization of dopamine in alkaline solution. Next, the 10 intermediate (GO-PDA) was grafted by polyacrylic acid, which was synthesized via reversible additionfragmentation chain transfer polymerization, through Michael addition reaction. The resulting products were characterized by Fourier transform infrared spectroscopy, thermal gravimetric analysis, transmission electron microscopy and X-ray photoelectron spectrometry. The characterization results indicated the success of adhesion and graft of PDA and polyacrylic acid, respectively. The resulting products also 15 exihibited sensitivity to pH. Apart from the polymer demonstrated in this work, many other polymers may be also grafted onto graphene oxide through the strategy when different monomers were adopted. Furthermore, this strategy can be also extended to surface modification of many other materials for the versatility of mussel inspired chemistry. It is therefore recommended that the novel strategy developed in this work should be a general strategy for fabrication of various functional nanocomposites, which can 20 exihibit better performance for different applications.

show abstract

Graphene oxide modification with graft polymers via nitroxide mediated radical polymerization

Cited by 43 publications

References 36 publications

Preparation and Characterization of Graphene Oxide‐Grafted Hexadecanol Composite Phase‐Change Material for Thermal Energy Storage

Preparation and Characterization of Graphene Oxide‐Grafted Hexadecanol Composite Phase‐Change Material for Thermal Energy Storage

The “Grafting‐to” of Well‐Defined Polystyrene on Graphene Oxide via Nitroxide‐Mediated Polymerization

Biomimic modification of graphene oxide

Contact Info

Product

Resources

About