Surface modification of multi-walled carbon nanotubes by a sol–gel reaction to increase their compatibility with PMMA resin

Wei, Hsiao-Fen; Hsiue, Ging‐Ho; Liu, Chin-Yh

doi:10.1016/j.compscitech.2006.06.005

Cited by 39 publications

(15 citation statements)

References 18 publications

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“…As a result, the incorporation of HNTs tends to lower the T g of the PLLA-based nanocomposites. The decrease of T g with the increase nanofiller content has also been reported in HNT/EPDM (Ethylene Propylene Diene Monomer) [37] and MWCNTs/PMMA [40] systems. It should be pointed out that the T g maintains almost constant value in the range of HNT content from 2 to 6 wt%, which suggests the enhancing effect of newly generated free volume is just canceled out by the restraining effect of additional HNTs incorporated in PLLA matrix on the free motion of PLLA chain segments.…”

Section: Resultsmentioning

confidence: 75%

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

et al. 2014

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The mechanical properties of the tissue engineering scaffold are important as they are tightly related the regeneration of structural tissue. The application of poly(L-lactic acid) (PLLA) nanofiber scaffolds in tissue engineering has been hindered by their insufficient mechanical properties. In the study, halloysite nanotubes (HNTs) were used to reinforce the mechanical properties of PLLA-based nanofibers. 4 wt% HNT/PLLA nanofiber membranes possess the best mechanical performance, which represents 61 % increase in tensile strength, 100 % improvement of Young's modulus, 49 % augment of elongation to break, as well as 181 % elevation in energy to break compared with neat PLLA samples. The satisfactory enhancement effect of HNTs can be attributed to the effective dispersion and incorporation of HNTs in PLLA matrix, which have been confirmed by the analysis of SEM, TEM, and FTIR. The addition of HNTs also improves the degree of crystallization and thermal stability of PLLA-based nanofibers. HNT-incorporated PLLA nanofiber membranes possess higher protein adsorption from fetal bovine serum than the neat PLLA specimen. Therefore, the introduction of HNTs can effectively enhance the mechanical properties of PLLA nanofiber scaffolds. HNT/PLLA nanofiber scaffolds possess potential application in skin tissue engineering.

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Section: Resultsmentioning

confidence: 75%

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

et al. 2014

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“…In addition, functionalization of CNT can significantly enhance the thermal and mechanical properties of PMMA [15][16][17][18]. It should be noted that the attachment of functional groups onto the CNT walls, from one hand enhances the interfacial adhesion between the matrix and the fillers [18], facilitating the dispersion of CNT [16,17], whereas, on the other hand, disrupts the π-bonds of the graphite lattice, which contribute the delocalized electrons, resulting in decreased values of conductivity in the composites [19].…”

Section: Pmma/cnt Composites Can Found Application As Electromagneticmentioning

confidence: 99%

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Logakis

Pandis

Pissis

et al. 2011

Composites Science and Technology

150

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To cite this version:E. Logakis, Ch. Pandis, P. Pissis, J. Pionteck, P. Pötschke. Highly conducting poly(methyl methacrylate) / carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties. Composites Science and Technology, Elsevier, 2011, 71 (6) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractNanocomposites of poly(methyl methacrylate) (PMMA) containing various multi-walled carbon nanotubes (MWCNT) contents were prepared using melt mixing. Several techniques were employed to study the influence of the MWCNT addition on the thermal, mechanical, electrical and dielectric properties of the PMMA matrix. The electrical percolation threshold (p c ) was found to be 0.5 vol.% by performing AC and DC conductivity measurements. Significantly high conductivity levels (σ dc ) were achieved: σ dc exceeds 10 -2 S/cm already at 1.1 vol.%, the criterion for EMI shielding (σ dc > 10 -1 S/cm) is fulfilled at 2.9 vol.%, and the highest loaded sample (5.2 vol.%) gave a maximum value of 0.5 S/cm. Dielectric relaxation spectroscopy measurements in broad frequency (10 -1 −10 6 Hz) and temperature ranges (-150 to 170 ºC) indicated weak polymer-filler interactions, in consistency with differential scanning calorimetry and dynamic mechanical analysis findings. Weak polymer-filler interactions and absence of crystallinity facilitate the achievement of high conductivity levels in the nanocomposites.

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“…[23] Furthermore, lower oxidation temperatures of the MWNTs in the composites compared to pure MWNTs can be observed, which is indicative of a good degree of nanotube segregation. [24] Raman and infrared spectroscopy (see Supporting Information) show that the obtained composite materials contain PANI in its emeraldine salt (ES) state. [25] Here, the presence of MWNTs does not lead to appreciable shifts or modification of bands typical of HCldoped ES.…”

Section: Resultsmentioning

confidence: 98%

Nanofibrilar Polyaniline: Direct Route to Carbon Nanotube Water Dispersions of High Concentration

Jiménez

Maser

Castell

et al. 2009

Macromol. Rapid Commun.

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Water dispersible nanofibrilar polyaniline (NF-PANI) provides a novel and direct route towards carbon nanotube water dispersions of high concentration. Carrying out the chemical synthesis of NF-PANI in the presence of carbon nanotubes (CNTs) results in an entirely nanostructured nanofibrilar polyaniline/carbon nanotube (NF-PANI/CNT) composite material that contains well segregated CNTs partially coated by NF-PANI. This new approach is simple, fast, and inexpensive, and enables the direct preparation of stable and homogeneous dispersions of the composites in water at concentrations up to 10 mg · mL(-1) , even for the highest CNT loadings of 50 wt.-% without the participation of surfactants or stabilizers.

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Surface modification of multi-walled carbon nanotubes by a sol–gel reaction to increase their compatibility with PMMA resin

Cited by 39 publications

References 18 publications

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

Toughening of electrospun poly(l-lactic acid) nanofiber scaffolds with unidirectionally aligned halloysite nanotubes

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Nanofibrilar Polyaniline: Direct Route to Carbon Nanotube Water Dispersions of High Concentration

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