Polymer nanocomposite

About: Polymer nanocomposite is a research topic. Over the lifetime, 8977 publications have been published within this topic receiving 297599 citations.

Scalable Fabrication of Carbon Nanotube/Polymer Nanocomposite Membranes for High Flux Gas Transport

Abstract: We present a simple, fast, and practical route to vertically align carbon nanotubes on a porous support using a combination of self-assembly and filtration methods. The advantage of this approach is that it can be easily scaled up to large surface areas, allowing the fabrication of membranes for practical gas separation applications. The gas transport properties of thus constructed nanotube/polymer nanocomposite membranes are analogous to those of carbon nanotube membranes grown by chemical vapor deposition. This paper shows the first data for transport of gas mixtures through carbon nanotube membranes. The permeation of gas mixtures through the membranes exhibits different properties than those observed using single-gas experiments, confirming that non-Knudsen transport occurs.

Determination of the stiffness of cellulose nanowhiskers and the fiber-matrix interface in a nanocomposite using Raman spectroscopy

Abstract: The stiffness of 10 nm diameter cellulose nanowhiskers is reported. These whiskers are produced by acid hydrolysis. These whiskers are dispersed in epoxy resin and placed on the surface of a beam of the same material and deformed in tension and compression using a four-point bending device. By following the molecular deformation of the whiskers using Raman spectroscopy it is shown that, by theoretical models of their dispersion and matrix reinforcement, their stiffness can be derived. The effects of debonding, matrix yielding, and buckling of whiskers are also discussed using this method as a means for studying nanocomposite materials.

Metal-Polymer Nanocomposites

Abstract: Preface.Contributors. 1. Physical and chemical properties of nanosized metal particles (C.N.R. Rao, et al.). 2. Metal containing polymers: cryochemical synthesis, structure and physico-chemical properties (L.I. Trakhtenberg and G.N. Gerasimov).3. Controlled pyrolysis of metal-containing precursors as a way for synthesis of metallopolymer nanocomposites (A.D. Pomogailo, et al.). 4. Nanostructured polymeric nanoreactors for metal nanoparticle formation (L.M. Bronstein).5. Metal-polymer nanocomposite synthesis: Novel Ex Situ and In Situ approaches (G. Carotenuto, et al.).6. Plamon absorption of embedded nanoparticles (A. Heilmann).7. Magnetooptic of granular materials and new optical methods of magnetic nanoparticles and nanostructures imaging (V. Belotelov, et al.). 8. Optical extinction of metal nanoparticles synthesized in polymer by ion implantation (A.L. Stepanov).9. Optically anisotropic metal-polymer nanocomposites (W. Caseri).Index.

A facile approach to chemically modified graphene and its polymer nanocomposites

Abstract: A scalable approach for the mass production of chemically modified graphene has yet to be developed, which holds the key to the large-scale production of stable graphene colloids for optical electronics energy conversion and storage materials, catalysis, sensors, composite, etc. Here a facile approach to fabricating covalently modified graphene and its polymer nanocomposites is presented. The method involves: i)employing a common furnace, rather than a furnace installed with a quartz tube and operated in inert gas as required in previous studies, to treat a commercial graphite interrelation compound with thermal shocking and ultrasonication and fabricate graphene platelets (GnPs) with a thickness of 2.51+-0.39nm that contain only 7 at% oxygen; ii)grafting these GnPs with commercial, long-chain surfactant which is able to create molecular entanglement with polymer matrixes by taking advantage of the reactions between the epoxide groups of the platelets and the end amine groups of the surfactant to produce chemically modified graphehe platelets (m-GnPs); and iii)solution-mixing m-GnPs with a commonly used polymer to fabricate nanocomposites. These m-GnPs are well dispered in a polymer with imrpoved mechanical properties and a low percolation threshold of electrical conductivity at 0.25col%. This novel approach could lead to the future scalable production of graphehe and its nanocomposites.

A Scalable, High-Throughput, and Environmentally Benign Approach to Polymer Dielectrics Exhibiting Significantly Improved Capacitive Performance at High Temperatures

Abstract: High-temperature capability is critical for polymer dielectrics in the next-generation capacitors demanded in harsh-environment electronics and electrical-power applications. It is well recognized that the energy-storage capabilities of dielectrics are degraded drastically with increasing temperature due to the exponential increase of conduction loss. Here, a general and scalable method to enable significant improvement of the high-temperature capacitive performance of the current polymer dielectrics is reported. The high-temperature capacitive properties in terms of discharged energy density and the charge-discharge efficiency of the polymer films coated with SiO2 via plasma-enhanced chemical vapor deposition significantly outperform the neat polymers and rival or surpass the state-of-the-art high-temperature polymer nanocomposites that are prepared by tedious and low-throughput methods. Moreover, the surface modification of the dielectric films is carried out in conjunction with fast-throughput roll-to-roll processing under ambient conditions. The entire fabrication process neither involves any toxic chemicals nor generates any hazardous by-products. The integration of excellent performance, versatility, high productivity, low cost, and environmental friendliness in the present method offers an unprecedented opportunity for the development of scalable high-temperature polymer dielectrics.