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Madison, WI, United States

Totolin V.,University of Wisconsin - Madison | Sarmadi M.,University of Wisconsin - Madison | Sarmadi M.,Center for Plasma Aided Manufacturing | Manolache S.O.,Center for Plasma Aided Manufacturing | Denes F.S.,University of Wisconsin - Madison
Journal of Applied Polymer Science | Year: 2010

Flame retardant cellulosic materials have been produced using a silicon dioxide (SiO2) network coating. SiO2 network armor was prepared through hydrolysis and condensation of the precursor tetraethyl orthosilicate (TEOS), prior coating the substrates, and was cross linked on the surface of the substrates using atmospheric pressure plasma (APP) technique. Because of protection effects of the SiO2 network armor, the cellulosic based fibers exhibit enhanced thermal properties (characterized by TGA and DSC) and improved flame retardant (proven by ASTM D1230-99). Furthermore, the surface analysis (XPS and SEM) confirmed the presence of the SiO2 network attached to the substrates even after intense ultrasound washes. © 2010 Wiley Periodicals, Inc. Source


Li Y.,Jiaxing University | Li Y.,Center for Plasma Aided Manufacturing | Li Y.,University of Wisconsin - Madison | Manolache S.,Center for Plasma Aided Manufacturing | And 4 more authors.
Applied Surface Science | Year: 2016

In order to improve the interfacial adhesion between hydrophilic ramie fibers and hydrophobic polypropylene (PP) matrices, ramie fibers are modified by atmospheric pressure dielectric barrier discharge (DBD) plasma with our continuous ethanol flow technique in helium environment. A central composite design of experiments with different plasma processing parameter combinations (treatment current, treatment time and ethanol flow rate) is applied to find the most influential parameter and to obtain the best modification effect. Field emission scanning electron microscope (SEM) shows the roughened surfaces of ramie fibers from the treated groups due to plasma etching effect. Dynamic contact angle analysis (DCAA) demonstrates that the wettability of the treated fibers drastically decreases. Microbond pullout test shows that the interfacial shear strength (IFSS) between treated ramie fibers and PP matrices increases significantly. Residual gas analysis (RGA) confirms the creation of ethyl groups during plasma treatment. This study shows that our continuous ethanol flow technique is effective in the plasma modification process, during which the ethanol flow rate is the most influential parameter but all parameters have simultaneous influence on plasma modification effect of ramie fibers. © 2015 Elsevier B.V. All rights reserved. Source


Totolin V.,University of Wisconsin - Madison | Sarmadi M.,University of Wisconsin - Madison | Sarmadi M.,Center for Plasma Aided Manufacturing | Manolache S.O.,Center for Plasma Aided Manufacturing | And 2 more authors.
Journal of Applied Polymer Science | Year: 2012

The objective of this work was to investigate plasma modification of viscose for environmentally friendly flame-retardant cellulosic materials. Sodium silicate layers were predeposited onto viscose and cotton flannel substrates and grafted/crosslinked using atmospheric pressure plasma. The modified cellulosic fabrics tested with the automated 45° angle test chamber showed significant improvement in their flame-retardant properties. Analysis conducted by TGA and DSC exhibited enhanced thermal stability of the treated fabrics. Furthermore, the surface analysis (XPS and SEM) confirmed the presence of the SiO 2 network attached to the substrate even after intense ultrasound washes. © 2011 Wiley Periodicals, Inc. Source

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