Covalent attachment of poly(ethylene glycol) on multi-walled carbon nanotubes

Han, Jung Hun; Choi, Jin; Oh, Saet Byeol; Jang, Jun Ho; Han, Jong Hun; An, Seong Soo A.; Kim, Hyung-Kook; Kim, Bog G.; Paik, Hyun‐jong

doi:10.1163/156855406775997006

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…5). The dispersivity of as-prepared PEG-MWNTs was close to those obtained from the conventional methods [3,4].…”

Section: China Functional Materials Technology and Industry Forumsupporting

confidence: 70%

“…Poly(ethylene glycol) (PEG) is known as a biocompatible, biodegradable, and nontoxic polymer, which has already been extensively used in medical and pharmaceutical areas. By grafting PEG segments to CNTs would give rise to CNT composites with excellent dispersibility [3,4], which has a promising application in drug delivery. However, the purification procedure was complex with amount of waste generated.…”

Section: Introductionmentioning

confidence: 99%

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Green Synthesis of Poly(ethylene Glycol) Modified Multi-Walled Carbon Nanotubes and their Dispersibility

Jiang

Chen

et al. 2013

AMM

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Poly (ethylene glycol) modified multi-walled carbon nanotubes were prepared by a green synthesis procedure, including oxidation, acyl chlorination and alcoholysis. All the liquid reagents were recycled by distillation or reduced pressure distillation, and complicated washing or purification was simplified. Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis were used to characterize the samples. The results indicated that PEG was grafted to the functionalized carbon nanotubes (f-CNTs) and the mass percentage of the grafted PEG was about 12%. After sonicatingf-CNTs in ethanol, the dispersibility off-CNTs in ethanol was about 0.46 mg/mL. The stability off-CNTs in ethanol was also tested by left standing a 0.4 mg/mLf-CNT/ethanol solution, no precipitation was found after 10 days.

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“…5). The dispersivity of as-prepared PEG-MWNTs was close to those obtained from the conventional methods [3,4].…”

Section: China Functional Materials Technology and Industry Forumsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Poly(ethylene Glycol) Modified Multi-Walled Carbon Nanotubes and their Dispersibility

Jiang

Chen

et al. 2013

AMM

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“…This approach is easy to carry out, with many linear polymers having functional end groups. [9][10][11][12][13][14][15][16][17][18][19] The apparent limitation of the ''graft onto'' approach lies in the low grafting density due to the hindrance of the pregrafted polymer chains. 20 On the other hand, the ''graft from'' approach involves in situ polymerization of monomers from the preformed initiators on the CNTs surfaces, resulting in higher grafting density.…”

Section: Introductionmentioning

confidence: 99%

A novel route for well‐defined polystyrene‐grafted multiwalled carbon nanotubes via the radical coupling reaction

Sui

Yang

Gao

et al. 2009

J of Applied Polymer Sci

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Multiwalled carbon nanotubes‐graft‐polystyrene (MWNTs‐g‐PS) was synthesized by atom transfer nitroxide radical coupling chemistry. MWNTs with 2,2,6,6‐tetramethylpiperidine‐1‐oxy (MWNTs‐TEMPO) groups was prepared first by esterification of 4‐hydroxy (HO)‐TEMPO and carboxylic acid group on the surface of MWNTs (MWNTs‐COOH); PS with bromide end group (PS‐Br) were then obtained by atom transfer radical polymerization using ethyl 2‐bromoisobutyrate as initiator and CuBr/N,N,N′,N″,N″‐pentamethyldiethylenetriamine as catalyst. The MWNTs‐TEMPO was mixed with PS‐Br and heated to 90°C in the presence of CuBr/PMDETA to form MWNTs‐g‐PS. The product was characterized by FTIR, NMR, TGA, and TEM. TEM indicates that the MWNTs are enveloped by the polymer molecules. The content of grafted polymers is 46.7% by TGA measurements when the number‐average molecular weight (Mn) of PS‐Br is 10,200 g/mol. The as‐prepared nanocomposites exhibit relatively good dispersibility in solvents such as CH2Cl2, THF, and toluene. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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“…The former involves direct reaction of existing polymers with the carboxylic acid groups on the CNTs. This approach is easy to carry out, with many linear polymers having functional end groups 9–19. The apparent limitation of the “graft onto” approach lies in the low grafting density due to the hindrance of the pregrafted polymer chains 20.…”

Section: Introductionmentioning

confidence: 99%

The effect of limited lateral resolution in the measurement of implant surface roughness: A computer simulation

Hansson¹,

Hansson

2005

J Biomedical Materials Res

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The surface roughness of dental implants affects the bone response elicited. Surface roughness is generally described by a range of surface texture parameters. The aim of the present study was to use computerized simulation to investigate the extent to which the lateral resolution of an instrument/method limits the accuracy of certain surface roughness parameters. The lateral resolution was defined as the pixel size of a profiling system. A surface roughness was simulated by a trigonometric function with random periodicity and amplitude. The function was divided into an array of pixels simulating the pixels of the profiling system. The mean height value for each pixel was used to calculate the surface roughness parameters. It was found that the accuracy of all the surface roughness parameters investigated decreased with increasing pixel size. This tendency was most pronounced for mean slope and developed length ratio; amounting to about 80% of their true values for a pixel size of 20% of the true mean high-spot spacing. It was concluded that the lateral resolution of an instrument/method severely compromises the precision of surface roughness parameters measured for roughness features with a mean high-spot spacing less than five times the lateral resolution.

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Covalent attachment of poly(ethylene glycol) on multi-walled carbon nanotubes

Cited by 6 publications

References 35 publications

Green Synthesis of Poly(ethylene Glycol) Modified Multi-Walled Carbon Nanotubes and their Dispersibility

Green Synthesis of Poly(ethylene Glycol) Modified Multi-Walled Carbon Nanotubes and their Dispersibility

A novel route for well‐defined polystyrene‐grafted multiwalled carbon nanotubes via the radical coupling reaction

The effect of limited lateral resolution in the measurement of implant surface roughness: A computer simulation

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