Preparation, characterization and properties of acid functionalized multi-walled carbon nanotube reinforced thermoplastic polyurethane nanocomposites

Barick, Aruna Kumar; Tripathy, D. K.

doi:10.1016/j.mseb.2011.08.001

Cited by 156 publications

(126 citation statements)

References 50 publications

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“…As the CNTs content in the polymer increases, the stress level gradually increases but at the same time the strain of the NCs decreased. Similar results have previously been obtained with other polymer NCs [22,24,41].…”

Section: Mechanical Propertiessupporting

confidence: 91%

“…The X-ray patterns of the MWNT displayed the presence of two peaks at 2h = 25.8 o and 42.7 o corresponding to the (002) and (100) reflections of the carbon atoms, respectively, which is in good agreement with the literature values [40]. Pure PI showed broad diffraction peaks at 2h = [18][19][20][21][22][23] o . The X-ray pattern of the NC5% showed mixed peaks appearing in the MWNT and pure PI, respectively.…”

Section: X-ray Diffractionsupporting

confidence: 86%

“…These reactive groups on CNTs will greatly enhance the combination of CNTs with polymeric matrix, thus improving the mechanical strength of the NCs [19]. Sidewall functionalization of CNTs also improves the dispersion of CNTs in a polymeric matrix [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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In situ preparation of high performance polyimide nanocomposites based on functionalized multiwalled carbon nanotubes

Abdehgah

Ashouri

Mousavian

2012

Designed Monomers and Polymers

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Nanocomposites of high performance polyimide and modified multiwalled carbon nanotube were prepared via in situ polymerization technique. Neat fluorinated polyimide was synthesized from the reaction between 4,4′-(hexafluoroisopropylidene) diphthalic anhydride and 2-(3,5-diaminophenyl)-benzimidazole. Polyimide/modified carbon nanotube nanocomposites enclosing 0.5, 1, 3, and 5% of functionalized carbon nanotube were successfully prepared by an in situ polymerization reaction through thermal imidization. The Fourier transform infrared spectroscopy, X-ray diffraction, field emission type scanning electron microscope, transmission electron microscopy, and thermogravimetric analysis techniques were used to evaluate the properties of the novel nanocomposites. According to thermogravimetric analysis results, the addition of the modified multiwalled carbon nanotube improved thermal stability of the obtained hybrid materials. The morphological images show that the carbon nanotubes were dispersed homogeneously in polymer matrix. The mechanical properties of nanocomposites were substantially improved by the incorporation of functionalized carbon nanotube into the polymer matrix.

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Section: Mechanical Propertiessupporting

confidence: 91%

Section: X-ray Diffractionsupporting

confidence: 86%

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In situ preparation of high performance polyimide nanocomposites based on functionalized multiwalled carbon nanotubes

Abdehgah

Ashouri

Mousavian

2012

Designed Monomers and Polymers

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“…XRD curves of the neat TPU ( Figure 6) exhibits a large and intense diffraction peak centered at 2$ = 19.98° assigned to the reflection plane (110) with dvalue of 0.45 nm. This diffraction pattern can be attributed to the irregular segments of the amorphous phase and, chains arranged on short-range of the TPU rigid phase, respectively [52,53]. According to Ramôa et al [41] the neat Mt used in this study manifests a crystalline peak at 6.3° (2$) assigned to the periodicity in the (001) direction of neat Mt and d-value is 1.4 nm.…”

Section: Results and Discussion 31 Characterization Of Conductive Fmentioning

confidence: 60%

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Ramôa¹,

Barra²,

Merlini³

et al. 2015

Express Polym. Lett.

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Abstract. This work describes the production of electrically conductive nanocomposites based on thermoplastic polyurethane (TPU) filled with montmorillonite-dodecylbenzenesulfonic acid-doped polypyrrole (Mt-PPy.DBSA) prepared by melt blending in an internal mixer. The electrical conductivity, morphology as well as the rheological properties of TPU/MtPPy.DBSA nanocomposites were evaluated and compared with those of TPU nanocomposites containing different conductive fillers, such as polypyrrole doped with hydrochloride acid (PPy.Cl) or dodecylbenzenesulfonic acid (PPy.DBSA) or montmorillonite-hydrochloride acid-doped polypyrrole (Mt-PPy.Cl), prepared with the same procedure. The TPU/MtPPy.DBSA nanocomposites display a very sharp insulator-conductor transition and the electrical percolation threshold was about 10 wt% of Mt-PPy.DBSA, which was significantly lower than those found for TPU/Mt-PPy.Cl, TPU/PPy.Cl and TPU/PPy.DBSA. Morphological analysis highlights that Mt-PPy.DBSA filler was better distributed and dispersed in the TPU matrix, forming a denser conductive network when compared to Mt-PPy.Cl, PPy.Cl and PPy.DBSA fillers. This morphology can be attributed to the higher site-specific interaction between TPU matrix and Mt-PPy.DBSA. The present study demonstrated the potential use of Mt-PPy.DBSA as new promising conductive nanofiller to produce highly conductive polymer nanocomposites with functional properties.

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“…As bandas agudas que aparecem em 1525 e 1220 cm -1 podem ser atribuídas às ligações C-N de grupos uretanos [30] . A banda em 1101 cm -1 corresponde à deformação axial assimétrica e simétrica da ligação C-O-C [30,31] . Para os nanocompósitos, não foram observadas bandas adicionais ou deslocamentos consideráveis em relação à PUE, nem diferenças devido à funcionalização dos nanotubos.…”

Section: Caracterização Dos Nanocompósitosunclassified

Otimização do processo de dispersão de nanotubos de carbono em poliuretano termorrígido

et al. 2016

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ResumoNeste trabalho foi desenvolvido um processo empregando misturador de alto cisalhamento e moinho de rolos para dispersar MWCNTs (multiwalled carbon nanotubes) puros e modificados em poliol visando a preparação de concentrados de 3% em massa. Condições otimizadas no trabalho permitiram a obtenção de suspensões com menor número e tamanho de agregados de MWCNTs. Compósitos contendo 0,5% em massa de MWCNTs foram preparados por diluição dos concentrados em poliol usando mistura mecânica seguida de cura. Resultados de microscopia indicaram que as melhores dispersões foram obtidas com os MWCNTs modificados, os quais permitiram um aumento na tensão na ruptura, no alongamento e uma melhor preservação da estabilidade térmica. Além disso, valores de condutividade elétrica sugerem que o compósito possa ser empregado para dissipação eletrostática. Dessa forma, os resultados obtidos demonstram que a modificação covalente da superfície dos MWCNTs e a utilização de estratégias eficientes de dispersão são essenciais para melhorar as propriedades finais dos nanocompósitos. Palavras-chave: dispersão de nanotubos de carbono, nanotubos de carbono modificados, propriedades mecânicas, poliuretano termorrígido elastomérico. AbstractA process employing high shear mixer and roll mill to disperse pristine and modified MWCNTs (multiwalled carbon nanotubes) in polyol was developed in order to prepare 3 wt% masterbatches. The optimum process conditions resulted in suspensions with smaller number and size of nanotube aggregates. Composites containing 0.5 wt% of MWCNTs were prepared by dilution of polyol masterbatches by simple mechanical mixing followed by cure. Microscopy data revealed better dispersion of modified carbon nanotubes in the polymer matrix, which promoted an increase in the tensile strength, elongation and a better preservation of thermal stability. Furthermore, electric conductivity values indicated that the composites can be used for electrostatic dissipation. These results demonstrate that the covalent modification of MWCNTs surface and the use of efficient dispersion strategies are essential to improve nanocomposites' final properties.

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Preparation, characterization and properties of acid functionalized multi-walled carbon nanotube reinforced thermoplastic polyurethane nanocomposites

Cited by 156 publications

References 50 publications

In situ preparation of high performance polyimide nanocomposites based on functionalized multiwalled carbon nanotubes

In situ preparation of high performance polyimide nanocomposites based on functionalized multiwalled carbon nanotubes

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Otimização do processo de dispersão de nanotubos de carbono em poliuretano termorrígido

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