Preparation and characterization of novel polyethylene/carbon nanotubes nanocomposites with core–shell structure

Influence of intercalation methods in properties of Clay and carbon nanotube and high density polyethylene nanocomposites

“…The amorphous halo for nanocomposites obtained by melt intercalation present smaller regions than for those obtained by solution intercalation. The lower viscosity of the medium in the solution intercalation method very probably allowed nanoparticles to get diffused more rapidly than in melt intercalation, in this way a more homogeneous dispersion of nanoparticles can be obtained and more CNTs or clays can act as sites for crystallization as already very well pointed out in the literature [22][23][24][25][26] . In addition, it can be observed a diffraction peak locates at 2θ=20° for the nanocomposites with CNT prepared by solution (PENCs).…”

“…This peak can be indexed as the plane (010) plane of the monoclinic form of PE 22 . In general, the monoclinic form of PE is metastable in pure polymers and is only obtained under either high pressure 23 or large deformations, for example, during mechanical stretching 24 , some authors also observed the formation of monoclinic PE crystals in nanocomposites with carbon nanotubes 25,26 . Zhang et al 26 affirmed that the formation of monoclinic PE crystals in nanocomposites with carbon nanotube demonstrates that the CNTs act as a nucleating agent for the monoclinic PE crystallization.…”

Formation of Ziegler‐type catalytic systems on the surface of multi‐walled carbon nanotubes for the production of composite materials by in situ polymerization

“…Many studies carried on production of polyolefin/CNT materials by in situ polymerization using different types of catalytic systems: Ziegler–Natta, metallocenes, and post‐metallocenes . Among these catalytic systems, Ziegler‐type catalysts are the ones most easy to produce, highly active, and make it possible to broadly regulate the molecular structure of the resulting polymer.…”

Thermodynamic stability of graphitic diamond films produced from catalytic chemical vapour deposition reactor

“…In recent times, extensive research has been conducted and reported in the field of carbon and its derivatives like diamonds and carbon nanotube [1][2][3][4][5][6][7]. Furthermore, CNTs have been used as adsorbents in wastewater treatment [8][9][10], as selective and sensitive quantification probes [11], to mention but a few.…”

“…(4), the net value of DG will become positive at reasonably low T. Therefore it can be predicted that at reasonably low temperatures, the arrangement of carbon atoms in CVD diamond films will not spontaneously transform to graphite at ordinary pressure, instead it remains as diamond films, represented as the forward transformation shown earlier in Eq. (1). Hypothetically, at this condition the diamond films could be referred to as being thermodynamically stable.…”