Low percolation threshold in polycarbonate/multiwalled carbon nanotubes nanocomposites through melt blending with poly(butylene terephthalate)

2013 ◽  
Vol 130 (1) ◽  
pp. 543-553 ◽  
Author(s):  
Sandip Maiti ◽  
Supratim Suin ◽  
Nilesh K. Shrivastava ◽  
B. B. Khatua
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Melt Blending ◽  
Multiwalled Carbon ◽  
Butylene Terephthalate

Preparation and Characterization of Multiwalled Carbon Nanotubes-Reinforced pCBT by Ring-Opening Polymerization of Cyclic Butylene Terephthalate

2016 ◽  
Vol 848 ◽  
pp. 125-131
Author(s):  
Yin He Su ◽  
Jun Rong Yu
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Butylene Terephthalate ◽  
Cyclic Butylene Terephthalate ◽  
The Matrix ◽  
Higher Temperature

Multiwalled carbon nanotubes (MWCNT)-reinforced polymerized cyclic butylene terephthalate (pCBT) nanocomposites were prepared by in situ ring opening polymerization of cyclic butylene terephthalate oligomers (CBT). The results of differential scanning calorimetry (DSC) indicated that the melting peak located at the low temperature (Tm1) increased and that at higher temperature (Tm2) decreased with the increasing of content of the MWCNT. During the cooling the MWCNT served as nucleation points from where crystallization can start. The more the MWCNT in the system the earlier the crystallization starts. The Morphological investigations performed by scanning electron microscopy (SEM) shown that the MWCNT were embedded in the matrix and held tightly by the matrix. The modulus and strength increased with MWCNT concentration in the nanocomposites, however, the elongation at break, absorbed energy at break and impact strength were decreased with the increasing of MWCNT content.

Convenient and solventless preparation of pure carbon nanotube/polybenzoxazine nanocomposites with low percolation threshold and improved thermal and fire properties

2014 ◽  
Vol 2 (19) ◽  
pp. 6814-6822 ◽  
Author(s):  
Camilo Zúñiga ◽  
Leïla Bonnaud ◽  
Gerard Lligadas ◽  
Juan Carlos Ronda ◽  
Marina Galià ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Bisphenol A ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Pure Carbon ◽  
Fire Properties

This work contemplates the use of pristine multiwalled carbon nanotubes (MWNTs) as nanofillers in the preparation of bisphenol A-based polybenzoxazine and diphenolic acid derived polybenzoxazine.

Tuning the insulator to conductor transition in a multiwalled carbon nanotubes/epoxy composite at substatistical percolation threshold

2009 ◽  
Vol 95 (15) ◽  
pp. 153106 ◽  
Author(s):  
Gabriella Faiella ◽  
Filomena Piscitelli ◽  
Marino Lavorgna ◽  
Vincenza Antonucci ◽  
Michele Giordano
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Epoxy Composite ◽  
Multiwalled Carbon

Phase behaviour, microstructure, and percolation of poly(ethylene glycol) filled by multiwalled carbon nanotubes and organophilic montmorillonite

2011 ◽  
Vol 45 (24) ◽  
pp. 2555-2566 ◽  
Author(s):  
N.I. Lebovka ◽  
E.A. Lysenkov ◽  
A.I. Goncharuk ◽  
Yu.P. Gomza ◽  
V.V. Klepko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Ethylene Glycol ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Phase Behaviour ◽  
Poly Ethylene Glycol ◽  
Multiwalled Carbon ◽  
Poly Ethylene ◽  
High Level

This work studies phase behavior, microstructure and percolation of the poly(ethylene glycol) (PEG), filled by multiwalled carbon nanotubes (MWCNTs), organo-modified montmorillonite (OMMT), and their mixtures, using differential scanning calorimentry (DSC), X-ray diffraction (XRD), electrical conductivity, and analysis of microscopic images. The DSC and XRD data showed a noticeable decrease of PEG crystallinity with increase of nanofiller content. Filling of PEG by MWCNTs was accompanied by a percolation threshold at ≈0.1 wt%, and the estimated electrical conductivity exponent ( t = 1.77 ± 0.07) was typical for the random percolation networks. The similar threshold behavior, but with higher percolation threshold ≈0.5–1.0 wt%, was observed for PEG filled by OMMT. The observed effect of OMMT-enhanced dispersion of MWCNTS in PEG at a high level of loading by nanoparticles offers good prospects for simultaneous improvement of the electrical and mechanical properties of PEG-based composites.

Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30912-30919 ◽  
Author(s):  
Yan Zhou ◽  
Hao Xiu ◽  
Jia Dai ◽  
Hongwei Bai ◽  
Qin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Multiwalled Carbon

In this study, we simultaneously introduced both poly(lactic acid) (PLA) and multiwalled carbon nanotubes (CNTs) into the polyurethane (PU) matrix via melt blending, to achieve balanced mechanical properties and good conductivity.

The Study on the Microstructures and High Performances of Melt Blending Polyurethane/Multiwalled Carbon Nanotubes Composites

2008 ◽  
Vol 16 (8) ◽  
pp. 509-518 ◽  
Author(s):  
Fengdan Jiang ◽  
Sizhu Wu ◽  
Yongji Wei ◽  
Liqun Zhang ◽  
Guohua Hu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Multiwalled Carbon Nanotubes ◽  
Microphase Separation ◽  
Thermoplastic Polyurethane ◽  
Melt Blending ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
High Temperature Tensile

A melt blending process was employed to prepare nanocomposites based on thermoplastic polyurethane (TPU) and multiwalled carbon nanotubes (MWNT). The content of MWNT filled in TPU was increased till 40 phr (parts per hundreds of rubber). The morphological, structural and mechanical properties of the resulting TPU nanocomposites were systematically investigated using scanning electron microscope (SEM), transmission electron microscope (TEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), dynamic mechanical thermal analysis (DMTA) and tensile testing. The results indicated that the unmodified MWNT were dispersed finely and uniformly in the TPU matrix beyond expectation, and the microphase separation structures of the TPU nanocomposites were slightly affected by the presence of MWNT. The mechanical properties of the TPU nanocomposites containing various amounts of MWNT at both room temperature and 120 °C were studied, which demonstrated that the modulus of TPU were greatly increased and the high temperature tensile strength of TPU was also prominently improved when MWNT content is higher. Moreover, the TPU nanocomposites exhibited improved thermal and electrical conductivities that might mean the TPU/MWNT nanocomposites have potential application as multifunctional materials.

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