Nguyen T.P.N.,Ulsan National Institute of Science and Technology |
Jun B.-M.,Ulsan National Institute of Science and Technology |
Lee J.H.,Toray Chemical Korea Inc. |
Kwon Y.-N.,Ulsan National Institute of Science and Technology
Journal of Membrane Science
This study systematically investigated the structure and performance of integrally asymmetric and thin film composite (TFC) FO membranes to gain a better understanding of the FO transport mechanism, and to suggest appropriate characteristics of FO membranes. The effect of structure parameters (S) on the performance of the membranes was also examined. Under various operating conditions, TFC membranes yielded superior Jw than integrally asymmetric CTA-based membranes, especially, with larger Jw leading to higher solute resistance at alkaline feed and draw solutions. However, the integrally asymmetric membranes possessed smoother surfaces, resulting in lower fouling propensity than the polyamide TFC membranes. Besides the structure, chemical composition of the skin layer also affected the performance. TFC membranes from Toray Chemical Korea (TCK) showed lower oxygen atomic content on the active layer (AL), higher negatively charged AL and higher fouling propensity compared to the TFC HTI membrane. The TCK membrane with a woven substrate served as a promising membrane, with 2.25 times higher Jw and 1.48 times less Js/Jw than the TFC HTI membrane. This study showed that a preparation of FO membranes with both enhanced antifouling resistance and TCK membrane-like open and thin structure are required to develop FO membranes with desirable characteristics. © 2015 Elsevier B.V. Source
Kim G.H.,Kyungpook National University |
Kim D.Y.,Kyungpook National University |
Kim S.G.,Woosung Chemical Ltd |
Kim D.H.,Toray Chemical Korea Inc. |
Seo K.H.,Kyungpook National University
Cellulose acetate (CA) hag a melting point higher than 200 °C due to strong intermolecular hydrogen bonding. The thermal decomposition of CA can proceed after melting. In order to avoid the hardship in melting, solvent such as CS2, or H2SO4 has been used to dissolve CA. Owing to the harmful nature of these solvents, the improvement in the process is highly desired. In this study, polyethylene glycol (PEG) was used as a plasticizing for CA. Triacetin (TA) and glyc^ erin (GC) were used to improve compatibility and plasticizer effect respectively. The thermal and mechanical properties of the CA/PEG/TA and CA/PEG/GC were tested at different composition ratios. The CA/PEG/TA shows significantly increment in mechanical properties but plasticizing effect was reduced to some extent, while the CA/PEG/GC have a slight increase in mechanical properties and plasticizer effect only at GC content of 5 phr. © 2015 The Polymer Society of Korea. All rights reserved. Source
Hyundai Motor Company, Kia Motors and Toray Chemical Korea Inc. | Date: 2015-03-30
Disclosed are a sound-absorbing material with improved sound-absorbing performance and a method for manufacturing the sound-absorbing material. The sound-absorbing material may improve sound absorption coefficient and transmission loss by forming large surface area and air layer, so as to induce viscosity loss of incident sound energy, and may provide light-weight design of a sound absorbing part or material since sound-absorbing performance may be substantially improved using reduced amount of fiber. Further, the sound-absorbing material may improve sound-absorbing performance by using binder fiber having rebound resilience, so as to maintain enough strength between fibers and also to maximize viscosity loss of sound energy transmitted to fiber structure.
Toray Chemical Korea Inc., Woongjin Chemical Co. and Saehan Industries Inc. | Date: 2006-03-21
RAW COTTON, FLOSS SILK, PLASTIC FIBERS FOR TEXTILE USE, SYNTHETIC FIBERS FOR TEXTILE USE, POLYETHYLENE ROPES.
Toray Chemical Korea Inc., Woongjin Chemical Co. and Saehan Industries Inc. | Date: 2006-04-04
SPUN COTTON, SANITARY WORKED SYNTHETIC MIXTURE OF COTTON THREAD AND YARN, SPUN THREAD AND YARN, SEWING THREAD AND YARN, REGENERATED FIBER THREAD AND YARN FOR TEXTILE USE, THREADS OF PLASTIC MATERIALS FOR TEXTILE USE, SYNTHETIC FIBER THREAD AND YARN FOR TEXTILE USE, CHEMICAL FIBER BASE MIXED THREAD AND YARN.