Polystyrene-attached graphene nanolayers by reversible addition-fragmentation chain transfer polymerization: a grafting from epoxy groups with various densities

Roghani‐Mamaqani, Hossein; Khezri, Khezrollah

doi:10.1007/s10965-016-1082-6

Cited by 31 publications

(11 citation statements)

References 50 publications

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“…The broad peak at 3432 cm −1 for all the samples originates from the adsorbed water molecules. After modification of CNTCOOH with EDA, the band at 1570 cm −1 is attributed to the bending vibrations of N―H units of EDA . Also, the bands in 2857 to 2908 cm −1 originate from the vibration of C―H groups and confirm attachment of EDA units to nanotubes .…”

Section: Resultsmentioning

confidence: 87%

Multifunctional curing component for epoxidized novolac resin by grafting poly (amidoamine) on carbon nanotubes using a divergent method

Pourhosseini‐Pakdel

Roghani‐Mamaqani

Azimi

et al. 2018

Polymers for Advanced Techs

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Poly(amidoamine)-grafted carbon nanotube (CNTD) was synthesized and used as a multi-component curing agent for epoxidized novolac resin (ENR). This composite and curing agent can improve thermal stability of the resin due to its tubular graphitic core and also dendritic amino-functionalities. The ENR was cured in the presence of different amounts of CNTD. Then, the thermal degradation temperature and also char content of the products were compared with the ethylenediamine-cured ENR.Successful functionalization of oxidized carbon nanotubes with poly(amidoamine) was evaluated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and thermogravimetric analysis. According to the thermogravimetric analysis results, char content of ethylenediamine-cured ENR is 44.7% which increased to 54.6%, 55.5%, and 56.9% by the addition of 3, 5, and 8 wt% of CNTD into the resin matrix. Also, addition of CNTD content increased thermal stability of the composites. The tubular structure of CNTD was observed by scanning and transmission electron microscopies. KEYWORDS carbon nanotube, epoxidized novolac resin, poly(amidoamine), thermal stability

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Section: Resultsmentioning

confidence: 87%

Multifunctional curing component for epoxidized novolac resin by grafting poly (amidoamine) on carbon nanotubes using a divergent method

Pourhosseini‐Pakdel

Roghani‐Mamaqani

Azimi

et al. 2018

Polymers for Advanced Techs

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“…Successful grafting of CTA at the surface of CNC is proven by a strong carbonyl band at 1635 cm −1 . In comparison with the spectrum of CNC, CNC‐ g ‐CTA shows an increase in CH stretching vibration area at 2850–2980 cm −1 , which can be ascribed to the methylene groups of CTA moieties . As a result of polymer grafting at the surface of CNC, the hydroxyl band area at 3030–3680 cm −1 is decreased .…”

Section: Resultsmentioning

confidence: 96%

Synthesis of dual thermo‐ and pH‐sensitive poly(N‐isopropylacrylamide‐co‐acrylic acid)‐grafted cellulose nanocrystals by reversible addition‐fragmentation chain transfer polymerization

Zeinali

Haddadi‐Asl

Roghani‐Mamaqani

2017

J Biomedical Materials Res

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Free and cellulose nanocrystals (CNCs)-grafted block copolymers of acrylic acid and N-isopropylacrylamide with various poly(N-isopropylacrylamide) (PNIPAAm) block lengths as dual temperature-and pH-sensitive materials were synthesized by reversible addition-fragmentation chain transfer polymerization via an R-approach method. Controlling lower critical solution temperature (LCST) of the products by changing the PNIPAAm block length, addition of CNC, and variation of pH was studied. The free and CNC-grafted block copolymers were analyzed by Fourier transform infrared and proton nuclear magnetic resonance. LCST of copolymers was measured by dynamic light scattering using their hydrodynamic diameters. The block copolymers reversibly form corecorona structure with PNIPAAm as core and poly(acrylic acid) (PAA) as shell above LCST at higher pH values. LCST point shifts to higher temperatures by increasing pH and CNC content and also lowering PNIPAAm block length. By decreasing pH below 4 at certainly low temperatures, PAA becomes core and PNIPAAm forms corona. Thermal behavior of the CNCgrafted polymers was studied by thermal gravimetric analysis and differential scanning calorimetry. Morphology of the polymer-grafted CNC was examined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy.

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“…FTIR results show that alkoxysilane‐modified polyurethane‐imide samples (PUBD and PUI) were successfully synthesized . GO shows some characteristic bands at 3436, 1702, 1642, 1228, and 874–1228 cm −1 ascribed to the stretching vibrations of hydroxyl, carboxyl, C=C, C−O, and oxirane groups, respectively . After modification of GO with APTES, the two peaks at 2864 and 2930 cm −1 are assigned to the symmetric and asymmetric stretching vibrations of methylene groups, respectively.…”

Section: Resultsmentioning

confidence: 96%

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

et al. 2020

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Hybrid composites of graphene and polyurethane (PU) were prepared via sol-gel method. The isocyanate-terminated PUs with chain extenders of pyromellitic dianhydride (PMDA) and butanediol were reacted with (3-aminopropyl) triethoxysilane (APTES) to obtain Polyurethane with PMDA chain extender (PUI) and Polyurethane with BD chain extender (PUBD), respectively. Sol-gel reaction between the silane-modified polyurethanes with APTES-modified graphene oxide resulted in the hybrid composites with high thermal degradation temperature and char content. Results of Fourier-transform infrared spectroscopy and proton nuclear magnetic resonance analysis confirmed chemical modification of graphene and successful preparation of the bifunctional silane-modified PUI and PUBD, respectively. Based on the thermogravimetric analysis (TGA) results, PMDA chain extender resulted in higher degradation temperature and char content in the hybrid composites. In addition, siloxane networks formed by sol-gel process resulted in synergistic effects on improving thermal stability of the PU materials. X-ray diffraction results in addition to the scanning and transmission electron microscopy images confirmed successful oxidation of graphite and also its modification process.

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Polystyrene-attached graphene nanolayers by reversible addition-fragmentation chain transfer polymerization: a grafting from epoxy groups with various densities

Cited by 31 publications

References 50 publications

Multifunctional curing component for epoxidized novolac resin by grafting poly (amidoamine) on carbon nanotubes using a divergent method

Multifunctional curing component for epoxidized novolac resin by grafting poly (amidoamine) on carbon nanotubes using a divergent method

Synthesis of dual thermo‐ and pH‐sensitive poly(N‐isopropylacrylamide‐co‐acrylic acid)‐grafted cellulose nanocrystals by reversible addition‐fragmentation chain transfer polymerization

Effect of Aliphatic and Aromatic Chain Extenders on Thermal Stability of Graphene Oxide/Polyurethane Hybrid Composites Prepared by Sol‐Gel Method

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