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Charles Q Yang - One of the best experts on this subject based on the ideXlab platform.

  • cross linking cotton cellulose by the combination of maleic Acid and sodium hypophosphite 1 fabric wrinkle resistance
    Industrial & Engineering Chemistry Research, 2010
    Co-Authors: Charles Q Yang, Dongzhong Chen, Jinping Guan
    Abstract:

    Durable press finishing agents used to produce wrinkle-resistant cotton garments are cross-linking agents for cotton cellulose. Polycarboxylic Acids have been the promising durable press finishing agents to replace the formaldehyde-based reagents when sodium hypophosphite (NaH2PO2) was used as the catalyst. In our previous research, we found that a Polycarboxylic Acid esterifies cotton cellulose by first forming a five-membered cyclic anhydride as a reactive intermediate. Maleic Acid (MA) is a bifunctional carboxylic Acid, therefore is not able to form the second cyclic anhydride intermediate once it forms the first ester linkage with cotton. However, we discovered that MA imparted wrinkle resistance to cotton fabrics when NaH2PO2 was present, thus indicating that MA was able to cross-link cotton. Sodium hypophosphite functions as the catalyst for the esterification of cellulose by MA, and the esterification takes place at relatively low temperatures (≥130 °C). Esterification of MA forms single esterlinka...

  • cellulase treatment of durable press finished cotton fabric effects on fabric strength abrasion resistance and handle
    Textile Research Journal, 2003
    Co-Authors: Charles Q Yang, Gary C Lickfield, Wenlong Zhou, Krishna Parachura
    Abstract:

    Enzyme washing is commonly used as a wet process technique to improve textile handle, appearance, and other surface characteristics of cottons in the industry. In this research, we have studied the effects of cellulase treatment on tensile strength, flex abrasion resistance, and handle of cotton fabric crosslinked by a Polycarboxylic Acid. The fabric is first treated with cellulase (pre-curing treatment), then crosslinked by 1,2,3,4- butanetetracarboxylic Acid (BTCA). The fabric is also crosslinked by BTCA first then treated with cellulase (post-curing treatment). We compare the performance of the durable press (DP) finished cottons treated with cellulase using these two different procedures, and we find that the pre-curing cellulase treatment has a more positive influence on fabric handle than the post-curing treatment, but it also causes significantly higher fabric strength loss than the post-curing treatment. We also find that the difference in wrinkle resistance of the DP finished cotton fabrics with ...

  • ir spectroscopy study of cyclic anhydride as intermediate for ester crosslinking of cotton cellulose by Polycarboxylic Acids v comparison of 1 2 4 butanetricarboxylic Acid and 1 2 3 propanetricarboxylic Acid
    Journal of Applied Polymer Science, 2001
    Co-Authors: Zhiping Mao, Charles Q Yang
    Abstract:

    In recent years extensive efforts have been made to use multifunctional carboxylic Acids as formaldehyde-free crosslinking agents for cotton to replace the traditional formaldehyde-based N-methylol reagents. In our previous research we found that a Polycarboxylic Acid esterifies cellulose through the formation of a five-membered cyclic anhydride intermediate by dehydration of two adjacent carboxyl groups. In this research we used Fourier transform IR (FTIR) spectroscopy to study the formation of cyclic anhydride intermediates and crosslinking of cotton by 1,2,4-butanetricarboxylic Acid (BTA) and 1,2,3-propanetricarboxylic Acid (PCA). BTA and PCA form five-membered cyclic anhydrides in the same temperature range. Both Acids form the anhydrides at lower temperatures when a catalyst is present. When an Acid molecule is bonded to cotton through an ester linkage, only PCA is able to form a second anhydride intermediate. We found that PCA is a more effective crosslinking agent, and it imparts higher levels of wrinkle resistance to the cotton fabric than BTA. Therefore, the formation of a five-membered cyclic anhydride by a Polycarboxylic Acid accelerates the esterification of cotton by the Acid. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2142–2150, 2001

  • mechanical strength of durable press finished cotton fabric part iv abrasion resistance
    Textile Research Journal, 2001
    Co-Authors: Charles Q Yang, Lei Qian, Gary C Lickfield
    Abstract:

    Durable press (DP) finishing, a process widely used by the textile industry to produce wrinkle-resistant cotton fabrics, causes considerable loss of fabric abrasion resistance. N-methylol compounds such as dimethyloldihydroxylethyleneurea (DMDHEU) are traditional durable press finishing agents. In recent years, multifunctional carboxylic Acids such as 1,2,3,4-butanetetracarboxylic Acid (BTCA) have been used as nonformaldehyde alternatives. In this research, we investigate the loss in fabric abrasion resistance caused by degradation and crosslinking of cellulose. Treatment of cotton by a Polycarboxylic Acid or a catalyst for DMDHEU results in a significant loss of its abrasion resistance. The lost abrasion resistance of cotton treated with BTCA is attributed to irreversible Acid-catalyzed depolymerization and reversible crosslinking of cellulose molecules. We have removed the crosslinking of BTCA-treated cotton fabric with alkaline hydrolysis, thus determining separately the magnitude of lost fabric abrasi...

  • mechanical strength of durable press finished cotton fabric part iii change in cellulose molecular weight
    Textile Research Journal, 2000
    Co-Authors: Charles Q Yang, Weishu Wei, Gary C Lickfield
    Abstract:

    Durable press finishing processes are commonly used in the textile industry to produce wrinkle-free cotton fabrics by crosslinking cotton cellulose. The most common crosslink ing agents are formaldehyde-based N-methylol reagents, such as dimethyloldihydroxyl ethyleneurea (DMDHEU). In recent years, multifunctional carboxylic Acids have been employed as nonformaldehyde durable press finishing agents. In this research, we use a multiple angle laser light scattering photometer to measure the change in cellulose molecular weight as a result of cotton cellulose depolymerization caused by a polycar boxylic Acid, a Lewis Acid used as a catalyst for DMDHEU, or their combination. Cellulose depolymerization takes place on the fabric treated with a Polycarboxylic Acid or a Lewis Acid. The combination of Lewis and Polycarboxylic Acids as an "activated" catalyst for DMDHEU causes more severe cellulose depolymerization. Our results indicate a direct correlation between tensile strength loss of the treated cotton and the...

A Abouokeil - One of the best experts on this subject based on the ideXlab platform.

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties. Language: en

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties.

Ahmed Elshafei - One of the best experts on this subject based on the ideXlab platform.

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties. Language: en

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties.

M Elshemy - One of the best experts on this subject based on the ideXlab platform.

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties. Language: en

  • eco friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties
    Carbohydrate Polymers, 2015
    Co-Authors: Ahmed Elshafei, M Elshemy, A Abouokeil
    Abstract:

    This research work deals with flame retardant and antibacterial finishing agent for cellulosic fabrics using TiO2 nanoparticles and chitosan phosphate. TiO2 nanoparticles were prepared by sol-gel method using titanium tetraisopropoxide. The size of TiO2 nanoparticles was characterized using transmission electron microscope (TEM). The application of nano TiO2 onto cellulosic fabrics (cotton 100%) was achieved in presence of Polycarboxylic Acid [1,2,3,4-butane tetracarboxylic Acid (BTCA)] with sodium hypophosphite (SHP) as catalyst and chitosan phosphate through conventional pad-dry-cure method. The effect of the finishing on the physical properties, flammability and antibacterial properties of cross-linked fabrics are investigated. Thermal gravimetric analysis (TGA) was employed to investigate the thermal decomposition behaviour of the treated samples. Limited oxygen indexes (LOI) of the treated cotton fabrics were investigated. The treated cotton fabric also reveals excellent antibacterial properties.

Zhengfa Yang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis and fluorescence properties of tb iii complex with a novel aromatic carboxylic Acid l as well as spectroscopic studies on the interaction between tb iii complex and bovine serum albumin
    Journal of Luminescence, 2013
    Co-Authors: Jiqing Bao, Zhenfeng Zhang, Ruiren Tang, Hongxing Han, Zhengfa Yang
    Abstract:

    Abstract A novel aromatic Polycarboxylic Acid ligand, 2,6-bis(3,5-dicarboxypyrazol-1-ylmethyl) pyridine ( L ) was designed and synthesized. Its corresponding Tb(III) complex [Tb L (H 2 O) 4 ]Cl·H 2 O was successfully prepared. The ligand L and the complex [Tb L (H 2 O) 4 ]Cl·H 2 O were characterized by elemental analysis, IR, 1 HNMR, EI–MS and TG–DSC. The investigation of fluorescence property of the complex showed that the Tb(III) ion could be sensitized efficiently by the ligand. In order to explore the potential biologically active value of [Tb L (H 2 O) 4 ]Cl·H 2 O, the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with bovine serum albumin (BSA) has been investigated by fluorescence quenching spectra, UV–vis absorbance and synchronous fluorescence spectra. The fluorescence quenching mechanism of BSA by [Tb L (H 2 O) 4 ]Cl·H 2 O was analyzed. The binding site number n and binding constant K a were calculated according to the double logarithm regression equation. The thermodynamic parameters showed the van der Waals and hydrogen bond interactions were the predominant intermolecular forces in the interaction of [Tb L (H 2 O) 4 ]Cl·H 2 O with BSA. Furthermore, the effect of [Tb L (H 2 O) 4 ]Cl·H 2 O on the conformation of BSA was analyzed according to synchronous fluorescence.