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: A facile and green approach for the synthesis of amphibious fluorescent carbon dots from natural polysaccharide is reported, and light-emitting polymer nanocomposites with excellent optical performance can be easily prepared by incorporation of the amphibious CDs into the polymer matrix.
145 citations
TL;DR: In this paper, the feasibility of using nanoparticles to make fire-resistant polymers was investigated, including organoclay, polyhedral oligomeric silsesquioxanes (POSS) and carbon nanotube (CNT).
Abstract: The paper investigates critically the feasibility to make fire proof polymer using nanoparticles. It includes organoclay, polyhedral oligomeric silsesquioxanes (POSS) and carbon nanotube (CNT). It is shown that they can be used to make material exhibiting low heat release rate (HRR) when they undergo heat. We have developed novel approaches to characterize quantitatively the nanodispersion by solid state NMR and by TEM associated with image analysis and we have demonstrated that the dispersion at the nanoscale is essential to achieve the best performance. On the other hand, low flammability of nanocomposites is only achieved in terms of HRR but they fail in terms of UL-94 and limiting oxygen index (LOI). To overcome this problem, we have combined nanoparticles with traditional flame retardants (intumescents) or with plasma treatment. The nanofillers act as synergists and offer an exceptional way for making fire safe polymers.
145 citations
TL;DR: In this article, trathin films of polystyrene were deposited on the surfaces of carbon nanofibers using a plasma polymerization treatment, and a small percent by weight of these surface-coated nanofiber were incorporated into poly styrene to form a polymer nanocomposite.
Abstract: Ultrathin films of polystyrene were deposited on the surfaces of carbon nanofibers using a plasma polymerization treatment. A small percent by weight of these surface-coated nanofibers were incorporated into polystyrene to form a polymer nanocomposite. The plasma coating greatly enhanced the dispersion of the nanofibers in the polymer matrix. High-resolution transmission-electron-microscopy (HRTEM) images revealed an extremely thin film of the polymer layer (∼3 nm) at the interface between the nanofiber and matrix. Tensile test results showed considerably increased strength in the coated nanofiber composite while an adverse effect was observed in the uncoated composites; the former exhibited shear yielding due to enhanced interfacial bonding while the latter fractured in a brittle fashion.
145 citations
TL;DR: These results are in essentially quantitative agreement with a force-level generalized Langevin equation theory for all the NP sizes and chain lengths explored, and imply that for these lightly entangled systems, activated NP hopping is not important.
Abstract: Large-scale molecular dynamics simulations show that nanoparticle (NP) diffusivity in weakly interacting mixtures of NPs and polymer melts has two very different classes of behavior depending on their size. NP relaxation times and their diffusivities are completely described by the local, Rouse dynamics of the polymer chains for NPs smaller than the polymer entanglement mesh size. The motion of larger NPs, which are comparable to the entanglement mesh size, is significantly slowed by chain entanglements, and is not describable by the Stokes-Einstein relationship. Our results are in essentially quantitative agreement with a force-level generalized Langevin equation theory for all the NP sizes and chain lengths explored, and imply that for these lightly entangled systems, activated NP hopping is not important.
145 citations
TL;DR: In this paper, the barrier properties of two sets of model epoxy nanocomposites with variations in nanoplatelet exfoliation level and aspect ratio have been investigated, and the results show that both the exfolation level and the aspect ratio of nanoplatelets have a significant effect on the nanocompositionite barrier properties.
145 citations