The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Good dispersion and interfacial interaction of carbon nanotubes in polymer matrices are important to effectively achieve mechanical reinforcement in nanocomposites. Previously, it was shown that poly(methyl methacrylate) (PMMA) helically wraps around single wall carbon nanotubes (SWNTs), and thus prevents SWNT bundling. In this work, influence of PMMA-wrapped SWNTs on tensile properties of PMMA/SWNT...
Polyacrylonitrile (PAN) fibers containing up to 40 wt% cellulose nanocrystals (CNCs) were processed. Structure, mechanical, and dynamic mechanical properties of these fibers were systematically investigated. The crystallinity, crystal size and crystallite orientation of PAN in PAN and PAN/CNC fibers significantly increases as the draw ratio increases from 4x to 15x. As compared to the control PAN...
Dynamic shear rheology study is conducted on the polyacrylonitirile (PAN) solution and composite solutions of PAN with up to 37.5 wt% annual plant lignin (APL) to address current barriers of PAN/lignin blend development as carbon fiber precursor. PAN/APL blends exhibit lower yield stresses, lower relaxation times, and lower viscosities than to PAN solution according to the dynamic frequency sweep...
Polyacrylonitrile-co-methacrylic acid (PAN-co-MAA) and cellulose nanocrystal (CNC) composite films were produced with up to 40 wt% CNC loading through the solution casting method. The rheological properties of the solution/suspensions and the structural, optical, thermal, and mechanical properties of the resulting films were investigated. The viscosity of the composite suspensions increased with higher...
Orientation and interfacial stress transfer in cellulose nanocrystals (CNC) reinforced polyacrylonitrile (PAN) nanocomposite fibers were determined by Raman spectroscopy. The 1095 cm−1 Raman band was used to quantify the orientation of CNC in composite fiber. Under VV (vertical/vertical) mode, polar plots of all composite fibers showed a two-fold symmetry. Under VH (vertical/horizontal) mode, it showed...
Improving volumetric energy density is one of the major challenges in nanostructured carbon electrodes for electrochemical energy storage device applications. Herein, a simple hydrothermal oxidation process of single‐walled carbon nanotube (SWNT) networks in dilute nitric acid is reported, enabling simultaneous physical densification and chemical functionalization of the as‐assembled randomly‐packed...
Composite fibers from polyacrylonitrile (PAN) and softwood lignin (SWL) were successfully fabricated to investigate the effects of lignin on fiber properties and thermal stabilization reaction kinetics. PAN/SWL composite precursor fiber exhibits comparable tensile properties to PAN fiber. This is attributed to the antiplasticization effect of lignin on PAN. Thermal stabilization reactions (e.g. oxidation,...
A unique crystalline signature not reported previously for atactic poly(methyl methacrylate) PMMA was observed in the X-ray diffraction of single wall carbon nanotubes (SWNT)/PMMA bucky papers indicating ordered PMMA wrapping on SWNT. This ordered PMMA wrapping was not observed in few wall carbon nanotubes (FWNT)/PMMA and multiwall carbon nanotube (MWNT)/PMMA bucky papers.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.