Synthesis and properties of homogeneously dispersed polyamide 6/MWNTs nanocomposites via simultaneous <i>in situ</i> anionic ring‐opening polymerization and compatibilization

Yan, Dongguang; Yang, Guisheng

doi:10.1002/app.29783

Cited by 18 publications

(5 citation statements)

References 32 publications

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“…The main advantage of this method is that it enables the grafting of polymer macromolecules onto the convex walls of the CNTs; this provides better nanotube dispersion and high nanotube contents. Yan and Yang10 prepared polyamide 6–multiwalled carbon nanotubes (MWNTs) nanocomposites by this approach, taking toluene 2,4‐diisocyanate functionalized MWNTs as activators for the anionic ring‐opening polymerization of ε‐caprolactam. Kong et al11 successfully functionalized MWNTs with various contents of poly(methyl methacrylate) layers by in situ atom transfer radical polymerization grafting polymerization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of poly(butylene terephthalate)/multiwalled carbon nanotube nanocomposites prepared by in situ polymerization and in situ compatibilization

Yang

2010

J of Applied Polymer Sci

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A novel cyclic initiator was synthesized from dibutyl tin(IV) oxide and hydroxyl-functionalized multiwalled carbon nanotubes (MWNTs) and was used to initiate the ring-opening polymerization of cyclic butylene terephthalate oligomers to prepare poly(butylene terephthalate) (PBT)/MWNT nanocomposites. The results of Fourier transform infrared and NMR spectroscopy confirmed that a graft structure of PBT on the MWNTs was formed during the in situ polymerization; this structure acted as an in situ compatibilizer in the nanocomposites. The PBT covalently attached to the MWNT surface enhanced the interface adhesion between the MWNTs and PBT matrix and, thus, improved the compatibility. The morphologies of the nanocomposites were observed by field emission scanning electron microscopy and transmission electron microscopy, which showed that the nanotubes were homogeneously dispersed in the PBT matrix when the MWNT content was lower than 0.75 wt %. Differential scanning calorimetry and thermogravimetric analysis were used to investigate the thermal properties of the nanocomposites. The results indicate that the MWNTs acted as nucleation sites in the matrix, and the efficiency of nucleation was closely related to the dispersion of the MWNTs in the matrix. Additionally, the thermal stability of PBT was improved by the addition of the MWNTs.

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Section: Introductionmentioning

confidence: 99%

Synthesis and properties of poly(butylene terephthalate)/multiwalled carbon nanotube nanocomposites prepared by in situ polymerization and in situ compatibilization

Yang

2010

J of Applied Polymer Sci

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“…Subsequently, the grafted material decreases, possibly due to the viscosity increase. TGA derivatives (Figure 11b) show bimodal curves for the nanohybrids obtained in short polymerization times (5 and 10 min), where the first peak might be attributed to oligomers and residual monomer, and the second corresponds to the degradation of Nylon‐6 23,62,63 . These findings suggest that oligomers and some polymeric chains of broad size distribution are grafted at the onset of polymerization.…”

Section: Resultsmentioning

confidence: 89%

Study of the dielectric heating of graphite oxide and its effect on the microwave‐assisted synthesis of Nylon‐6/graphite oxide polymeric hybrid nanocomposites

Ledezma-Rodríguez

Hernández

Yáñez‐Macías

et al. 2021

J of Applied Polymer Sci

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The present research focuses on the study of the microwave dielectric heating (DH) of graphite oxide (GrO) during the synthesis of Nylon-6/GrO hybrid polymeric nanocomposites (HPNCs) employing different microwave input powers and two GrO morphologies. In this regard, we evaluated GrO powder (GrOP) with dimensions ranging from nanometers to microns and GrO films (GrOF) with millimeter lengths and micron thicknesses. Both morphologies show the same oxidation degree and concentration of functional groups. However, they differ in the number of stacked graphene oxide sheets, thus modify their surface area. The results indicated that the morphology of GrO plays a determining role in its DH behavior in the microwave-assisted polymerization (MAP).On one hand, GrOF contains a high concentration of graphene sheets that induce both an increase in DH and the formation of hot spots. In addition, GrOF has a greater attractive force between its sheets, since its interlamellar space is smaller than 8.4 Å, which makes its exfoliation more difficult. The aforementioned effects significantly reduce the exfoliation and hybridization of GrOF. On the other hand, the larger interlamellar spacing in GrOP weakens the attractive forces compared to GrOF. The lower concentration of graphene oxide lamellae prevents the formation of hot spots, and homogeneously dissipates DH in the reaction medium, maximizing its exfoliation and hybridization. In addition, its behavior presents a defined trend concerning time. These results highlight the importance of considering the GrO morphology in the synthesis of HPNCs as it globally affects the MAPs process, as well as GrO reduction, exfoliation, and hybridization.

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“…The MWNT-g-PA6 was homogeneously dispersible in organic solvents such as formic acid and could melt when mixed with ε-caprolactam. In a related study, by the same group, a similar grafting was performed using toluene 2,4-diisocyanate (TDI)-functionalized MWNTs [63].…”

Section: Poly(peptides) and Polyamidesmentioning

confidence: 99%

Surface-Initiated Anionic Polymerization from Nanomaterials

Baskaran

2015

Anionic Polymerization

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Surface-initiated anionic polymerization is one of the many techniques used for the modification of organic and inorganic nanomaterials. Surface modification of nanomaterials using polymers is a unique way to reduce interface incompatibility of nanomaterials for applications in new technologies. The properties of nanomaterials strongly depend on their compatibility with organic phases either in bulk or in solution. This chapter focuses on surface grafting of polymers using living anionic polymerization from various nanomaterials and provides accounts on the developments in this area.

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Synthesis and properties of homogeneously dispersed polyamide 6/MWNTs nanocomposites via simultaneous in situ anionic ring‐opening polymerization and compatibilization

Cited by 18 publications

References 32 publications

Synthesis and properties of poly(butylene terephthalate)/multiwalled carbon nanotube nanocomposites prepared by in situ polymerization and in situ compatibilization

Synthesis and properties of poly(butylene terephthalate)/multiwalled carbon nanotube nanocomposites prepared by in situ polymerization and in situ compatibilization

Study of the dielectric heating of graphite oxide and its effect on the microwave‐assisted synthesis of Nylon‐6/graphite oxide polymeric hybrid nanocomposites

Surface-Initiated Anionic Polymerization from Nanomaterials

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