Topic
Polymer nanocomposite
About: Polymer nanocomposite is a research topic. Over the lifetime, 8977 publications have been published within this topic receiving 297599 citations.
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TL;DR: Modified CNC was extruded with polypropylene at 190 °C, and the ensuing composites were characterized in terms of mechanical, thermal, and morphological properties; the melt rheology of PP-based nanocomposites was also reported.
Abstract: On account to their high mechanical properties along with high reinforcing capacity, cellulose nanocrystals (CNCs) could be the ultimate choice for polymer nanocomposites as filler. Recently, different strategies have been investigated for the melt extrusion of CNC-based polymer nanocomposites because it is a solvent-free process and because this technique is more viable for commercial industrialization. However, most thermoplastic polymers are processed at high temperatures, and sulfuric acid preparation of CNC limits the processing because of surface sulfate groups degradation. In this study we profitably used these negatively charged groups, and quaternary ammonium salt was ionically adsorbed on CNC by a simple aqueous method. Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction were used to characterize adsorbed CNC, and changes in polarity were investigated by contact angle measurements. Modified CNC was extruded with polypropylene at 190 °C, and the ensuing composites were characterized in terms of mechanical (by dynamic mechanical analysis and tensile tests), thermal (by differential scanning calorimetry), and morphological (scanning electron microscopy) properties. The melt rheology of PP-based nanocomposites was also reported.
101 citations
TL;DR: In this article, the effect of the chemistry and shear on the dispersion of clay in polymer matrix via dynamic packing injection molding (DPIM) is investigated, in which the melt is firstly injected into the mold, then forced to move repeatedly in a chamber by two pistons that moved reversibly with the same frequency as the solidification progressively occurs from the mold wall to the molding core part.
101 citations
TL;DR: In this article, the effect of Fe nanoparticles on the structural and optical properties of polyvinyl alcohol (PVA) nanocomposite films were investigated using X-ray diffraction, a scanning electron microscope, and UV-Vis spectroscopy.
Abstract: Polyvinyl alcohol (PVA) nanocomposite films embedded with iron (Fe) nanoparticles were prepared via the solution cast technique. The effect of Fe nanoparticles on the structural and optical properties of PVA nanocomposite films were investigated using X-ray diffraction, a scanning electron microscope, and UV–Vis spectroscopy. The size of the Fe nanoparticles was calculated using the Debye–Scherrer equation, and it was found that there was an increase in nanoparticle size after dispersion in the polymer matrix due to aggregation. Optical parameters such as optical band gap, Urbach energy, refractive index and extinction coefficient were investigated. The transmittance of a pure PVA film decreases from 82% to 18% after 3 wt% Fe nanoparticle dispersion in a polymer matrix. The direct optical band gap was found to decrease whereas Urbach energy was found to increase with the increase in Fe nanoparticle concentration. In addition, the refractive index and extinction coefficient of polymer nanocomposite films were found to increase compared to those made of pure PVA. Also, the optical dielectric and optical conductivity were observed to increase with an increase in Fe nanoparticle concentration.
101 citations
TL;DR: In this paper, a class of microcellular polymer nanocomposites of multi-walled carbon nanotubes (MWCNTs) with a cellular structure was reported.
100 citations
TL;DR: The synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1-xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution is reported.
Abstract: Spectroscopic gamma-photon detection has widespread applications for research, defense, and medical purposes However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic gamma photopeak Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution The efficient Forster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible photons produced per MeV of gamma-photon energy) and gamma
100 citations