Carbon nanotubes/polyamide 6.6 nanostructured composites crystallization kinetic study

Ribeiro, Bruno; Nohara, L. B.; Oishi, Sílvia Sizuka; Costa, Mirco; Botelho, E. C.

doi:10.1177/0892705711430532

Cited by 8 publications

(9 citation statements)

References 36 publications

(63 reference statements)

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“…The size of CNTs is comparable with the size of the polymer chains; hence, the presence of nanoparticles may have a major impact on the morphology. 39 They can act as a nucleating agent, but on the other hand, well-dispersed particles may block the growth of crystals. The effect of these particles always depends on the properties of the surrounding system and processing parameters.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effects of carbon nanotubes on the mechanical properties of basalt and carbon fiber-reinforced polyamide 6 hybrid composites

Szakács

Mészáros

2017

Journal of Thermoplastic Composite Materials

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In this study, a new type of carbon nanotube (CNT) and micro fiber (carbon or basalt)-reinforced polyamide 6 hybrid composites were prepared and investigated. Hybrid composites were produced by melt compounding, and specimens were injection molded. Thanks to the proper dispersion of CNT, a remarkable increment in tensile properties was exhibited. The scanning electron microscopy of the fracture surfaces of the tensile-tested materials revealed that during composite preparation the presence of the fibers in the melt facilitated a better dispersion of the CNT, which explains the enhancement in the tensile properties. The deformation components of the materials were also examined at different load levels. The presence of carbon nanotubes decreased residual deformation at every applied load level. Protruding fiber length investigation revealed that improved mechanical properties are not related to fiber-matrix adhesion but to the reinforcing and stress homogenization effect of nanotubes in the matrix.

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Section: Resultsmentioning

confidence: 99%

Synergistic effects of carbon nanotubes on the mechanical properties of basalt and carbon fiber-reinforced polyamide 6 hybrid composites

Szakács

Mészáros

2017

Journal of Thermoplastic Composite Materials

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“…There are several research results concerning the thermal stability and the decomposition kinetics of thermoplastic resin, with various calculating methods . The kinetic analysis of nonisothermal degradation of polyamide composites has been studied intensively recently.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and thermal degradation kinetics of short and long glass fiber reinforced PA10T composites

Guo

Wang

et al. 2018

Polymer Engineering & Sci

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In this work, the long glass fiber reinforced poly(decamethylene terephthalanide) (PA10T/LGF) composites and short glass fiber reinforced PA10T (PA10T/SGF) composites were prepared by two different extrusion processing methods, respectively. The results of mechanical properties reveal the introduction of glass fiber can improve the performance of the material, and the LGF reinforced PA10T composites can achieve much higher performance than the SGF reinforced ones at the same level of fiber contents. The thermal stabilities of neat PA10T, PA10T/SGF, and PA10T/LGF are investigated by nonisothermal TG analysis. The thermal degradation kinetics is introduced by using Kissinger and Flynn‐Wall‐Ozawa methods and the thermal degradation mechanism functions of the samples are calculated by the Coats‐Redfem model. The results show that the thermal stabilities of PA10T/SGF and neat PA10T are better than that of PA10T/LGF. In addition, the incorporation of glass fiber into PA10T do not have much effect on the reaction mechanism type of thermal degradation compared with that neat PA10T. Furthermore, the thermal stability analysis of the composites is verified by the computed results of Gibbs free energy (ΔG#). POLYM. ENG. SCI., 59:246–253, 2019. © 2018 Society of Plastics Engineers

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“…Despite the excellent mechanical and electrical properties of carbon nanotube (CNT), it has been proved predominantly that CNTs are superior nucleating agents for various semicrystalline polymers, [1][2][3] such as isotactic polypropylene (iPP), polyethylene, poly(ethylene terephthalate), poly(butylene terephthalate), poly(L-lactic acid), and polyamide 6. Molecular simulation has suggested that a wrapping process of molecular chains around CNTs and subsequent formation of ordered structure are the origin of the heterogeneous nucleation, 4,5 which could stem from the intermolecular interactions between polymers and CNTs, such as electrostatic and van der Waals forces 6 and hydrogen bonding.…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal crystallization of isotactic polypropylene in carbon nanotube networks

Chen

Zhong

et al. 2016

Journal of Thermoplastic Composite Materials

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Isotactic polypropylene (iPP) composites with carbon nanotube (CNT) networks at relatively high loadings could have various applications such as electromagnetic interference shielding and thermal conductivity. The crystallization behavior of iPP inside CNT networks could be very much related to the above properties, which was found to be quite different from that of neat iPP in this work. In CNT networks, CNTs not only act as effective heterogeneous nucleating agents to noticeably increase the onset temperature (more than 18°C) of iPP crystallization but also bring strong confinement on the mobility of iPP chains and then reduce the overall crystallization rate of iPP matrix. It is interesting to find that CNT networks, especially in the case of ultrahigh loading (90 wt%), have remarkable confinement effect on crystallization of iPP, overcoming the heterogeneous nucleation of CNTs, resulting in a decline of crystallization rate of iPP. The nonisothermal crystallization kinetics of iPP in the dense CNT network quite fits to the modified Avrami mode by Jeziorny, even more satisfactorily than the case of neat iPP. When confinement effect is dominated during crystallization, we found that the perfection and size of crystallites are extremely decreased at ultrahigh loading, leading to a very low melting point of iPP (approximately 140°C).

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Carbon nanotubes/polyamide 6.6 nanostructured composites crystallization kinetic study

Cited by 8 publications

References 36 publications

Synergistic effects of carbon nanotubes on the mechanical properties of basalt and carbon fiber-reinforced polyamide 6 hybrid composites

Synergistic effects of carbon nanotubes on the mechanical properties of basalt and carbon fiber-reinforced polyamide 6 hybrid composites

Thermal stability and thermal degradation kinetics of short and long glass fiber reinforced PA10T composites

Nonisothermal crystallization of isotactic polypropylene in carbon nanotube networks

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