Papers by Keyword: Polyester

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Authors: Guang Xian Zhang, Fang Xu, Wei Hu, Feng Xiu Zhang
Abstract: In this paper, a durable superhydrophilic modification was applied to polyester fabric to improve its wettability- HAS treatment. The wetting ability of HAS treated polyester fabric improved a lot; the water contact angle could decrease to 00 in 3s; the water content increased up to 115%; the wicking distance increased up to 15cm; spraying rate improved to 1 degree. The wearability tests showed the breaking strength and creasability remain almost the same as untreated polyester fabric.
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Authors: Anna Borisova, Skaidrīte Reihmane
Abstract: Successful results of textile materials finishing process in order to gain desired properties to the fabric according to customers’ demands mainly depend on properly-carried pre-treatment stages. The present study covers twill weave cotton/polyester fabric’s modification in alkaline medium at different temperatures and treatment durations through exhaustion (hot and cold treatment) and pad-steam process. An influence of the reduction agent addition was ascertained. Weight loss, water absorbency, vertical wicking, dye uptake, colour measurements, surface morphology and psysicomechanical characteristics were determined. Samples and recommendations of optimal alkaline treatment technologies are developed.
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Authors: Zhao Qin Dong, Guo Qiang Chen
Abstract: The alkaline hydrolysis of polyester fabric in NaOH solution in the presence of several 1-alkyl-3-methylimidazolium bromine ionic liquids (ILs), CnMImBr (n=8, 12, 14, 16) was examined in comparison to the use of cetyltrimethyl ammonium bromide (CTAB) as an accelerant. The weight loss of polyester fabric was found to be greatly dependent on the concentrations of ILs and the length of alkyl groups in ILs. C14MImBr and C16MImBr exhibited good catalytic actions. The use of C16MImBr as an accelerator could endow polyester fabrics with slightly higher weight loss in comparison with CTAB. In the presence of C16MImBr, the activation energy of polyester hydrolysis reaction was slightly higher than that for the use of C14MImBr as a catalyst. In summary, the CnMImBr with long carbon chain can be employed as the novel accelerator for the weight reduction process of polyester fabrics.
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Authors: Zhu Long, Yu Feng Long, Jun Jun He, Hai Bo Deng
Abstract: The mixture of wheat straw (WS) and polyester (PC) was liquefied in supercritical ethanol. Liquefied products produced and liquefied residue from the liquefaction under different supercritical conditions were analyzed by GC-MS, SEM and IR. GC-MS analysis of the liquefied products indicates that ethanol would decompose. And the most compounds in the liquefied product had the structure of phenol and phenol derivatives, which came from the degradation products of PC and WS. SEM analysis show that the wheat straw powder possessed larger particles with smooth surfaces while the residue from liquefaction had smaller particles with rough surfaces because of drastically degraded from the wheat straw powder surface under supercritical conditions. FT-IR analysis showed that the lignin was easily degraded during the liquefaction process, and also found to the cellulose is very difficult to liquefy for its crystalline structure.
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Authors: Fei Ling Sun, Min Zheng
Abstract: Modified polyester fabric with pores was treated with self-synthesized TiO2 under high-temperature (130°C) and high-pressure condition via one-bath process. By SEM, uniform holes and many particles could be seen on the treated fiber surface. EDX was used for analysis. Results show that materials deposited on the fiber surface were TiO2. Shake flask test was selected to evaluate the antibacterial ability of the treated fabric. Antibacterial rate against E.coli and S.aureus were 96.24% and 92.00%, respectively. At the same time, the durability to laundering was also tested. The results indicated that antibacterial property of the treated fabric was still excellent even after it was washed 50 times
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Authors: Dasarathan Kamalraj, V. Subramaniam
Abstract: Sericin is a natural protein which is removed from silk in a process called degumming. In India, 250-300 tons of sericin is extracted per year and goes as waste, it has wide range of application because of its properties like antioxidant, antibacterial, UV resistant, anticoagulant and moisture retention capacity. This paper is concerned with the application of sericin on polyester fabrics using cross linking agents like di-methylol di-hydroxy ethylene urea (DMDHEU) and glutaraldehyde. The Polyester fabrics are pretreated with sodium hydroxide (NaOH) and low temperature plasma (Oxygen gas). This pretreated sericin applied polyester fabrics show the better improvement in the wicking (moistureabsorbency) and good dye uptake properties on acid dyed fabric and it will be used for medical application.
156
Authors: Bo Zhao
Abstract: In this paper, back-propagation (BP) neural network model is introduced and established. This work describes the application of the BP artificial neural network model for the purpose of predicting the polyester/cotton yarn hairiness. This approach has been developed and evaluated with the use of multiple sets of data, comprising of a range of processing parameters. The yarn hairiness of ring spinning is strongly related to the processing parameters. However, it is difficult to establish physical models on the relationship between the processing parameters and the yarn hairiness. Due to the artificial neural network can fully approximate any complex nonlinear system and study dynamic behavior of any serious undetermined system. It has a highly parallel calculation ability, strong robustness and fault tolerance. So using the artificial neural network to predict the polyester/cotton yarn hairiness of ring spinning is a very effective way. The experimental results and corresponding analysis show that the BP neural network model is an efficient technique for the yarn hairiness of ring spinning prediction and has wide prospect in the application of ring spinning yarn production system.
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Authors: Naomi Cohen-Arazi, Ilanit Hagag, Michal Kolitz, Abraham J. Domb, Jeoshua Katzhendler
Abstract: Optically active α-hydroxy acids derived from amino acids have been synthesized and polymerized into new biodegradable polyesters. The variety of functional side chains enables the design of positively charged, negatively charged, hydrophobic and hydrophilic chiral building blocks or any combination of these constituents. Hydroxy acids of 15 natural amino acids were prepared with retention of configuration using a straightforward and reliable method of diazotization of α-amino acids. Polyesters were synthesized from these hydroxy acids by a number of methods: direct condensation in bulk, microwave assisted synthesis and ring opening polymerization. The molecular weight of the prepared polymers ranges between 2000 to 5000Da for the direct condensation and the microwave methods, whereas the ring opening polymerization results in high molecular weight polymers (20000 to 30000Da). The polymers were analyzed for their optical activity (Circular Dichroism Spectroscopy), thermal properties (DSC), solubility, molecular weight and polydispersity (GPC), and aqueous degradation. These polymers were tested for their compatibility to neuronal cells growth and differentiation.
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Authors: Ebtisam H. Hasan, Magdy A. Helal, Mohamed A. Nour, Khaled M. Shokry
Abstract: Glass-fiber reinforced plastics marketed are predominately based on one type of glass-fiber but with a wide variety of fiber formats, resin types, fillers and a wide range of process techniques. These choices result in materials with a wide range of behaviors in different applications. The aim of this work is to study the effect of different weight fraction for two types of polymeric composites for construction use. The properties of the two types of composites are characterized using conventional techniques.. The study revealed that weight fraction of 30 40 % for reinforcing glass fiber/polyester composite would achieve better characteristics. The addition of short fibers to a polymeric matrix will reduce its coefficient of thermal expansion.
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Authors: Jian Xue Song, Chuan Li Chang, Hai Rong Yang
Abstract: Four kinds of fiber reinforced asphalt mixture formula are made, i.e., non fiber, polyester fiber, polyacrylonitrile fiber and the compound of the last two fibers, and then the Residual Marshall Stability (RMS) tests and Residual Cleavage Strength (RCS) tests are carried out. It is found that with the adding of fiber, the RMS is raised from 88% to 92% and the RCS from 86% to 88%. In the view of water-relating stability enhancement, the compound fiber is the best, the polyacrylonitrile fiber is the second, and the polyester fiber is at last, however, it is still better than plain asphalt mixture. More compaction work should be done on fiber reinforced asphalt mixture in practical engineering.
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