The Experts below are selected from a list of 8337 Experts worldwide ranked by ideXlab platform

Guo Qiang Chen - One of the best experts on this subject based on the ideXlab platform.

  • Synergistic Effects and Mechanism of Modified Silica Sol Flame Retardant Systems on Silk Fabric
    MDPI AG, 2018
    Co-Authors: Chun Liu, Tie Ling Xing, Bingju Wei, Guo Qiang Chen
    Abstract:

    The nano-silica sol was prepared by sol-gel method, and the boric acid, urea, cyanoguanidine, melamine cyanurate (MCA), 1-hydroxyethane 1,1-diphosphonic acid (HEDP), and 6H-dibenz (C,E) (1,2) oxaphosphorin-6-oxide (DOPO) were added to the silica sol to modify the flame retardant through physical doping and chemical bonding. According to the formula proposed by Lewin, the calculation of flammability parameters were obtained by the limiting oxygen index meter, the micro calorimeter, the vertical burner, and the thermogravimetric analyzer proved that there was a synergistic or additive effect between the B/N/P flame retardant and the silica sol. Fourier transform infrared (FT-IR) spectrum, scanning electron microscopy, and pyrolysis gas chromatography-mass spectrometry were used to characterize the morphology, structure, and pyrolysis products of treated Silk Fabric and residues after combustion. The results show that the flame retardancy of silica-boron sol is mainly caused by endothermic reaction and melt covering reaction. Silicon-nitrogen sol acts as a flame retardant through endothermic reaction, release of gases, and melting coverage. Silicon-phosphorus sol achieves flame retardancy by forming an acid to promote formation of a carbon layer and melting coverage. Silica sol and other flame retardants show excellent flame retardanty after compounding, and have certain complementarity, which can balance the dosage, performance, and cost of flame retardants, and is more suitable for industrial development

  • Flame Retardant Finish of Silk Fabric with Dimethyl Phosphonate Doped Silica Sol
    Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016), 2016
    Co-Authors: Qiang-hua Zhang, Guo Qiang Chen, Wei Zhang, Tie Ling Xing
    Abstract:

    In this paper, a dimethyl phosphonate doped (P-doped) silica sol was prepared from a tetraethyl silicate inorganic precursor and applied to Silk Fabric as a flame retardant finish through the sol-gel process. The X-ray photoelectron spectroscopy (XPS) analysis and scanning electron microscope (SEM) images indicated a phosphorus-containing silica network successfully formed on the Silk Fabric surface. The flammability of the treated Silk Fabric was investigated by the limiting oxygen index (LOI) and vertical combustion test. The results indicated that the treated Silk Fabric were flame retardant with a higher limiting oxygen index (LOI) and shorter damage length. Moreover, micro calorimeter combustion testing and thermal gravimetric analysis indicate 50% of P-doped silica sol treated Silk Fabric exhibited a lower heat release rate and higher char residue, which demonstrates a synergistic effect between the silica and phosphorus.

  • Durable flame retardant finish for Silk Fabric using boron hybrid silica sol
    Applied Surface Science, 2016
    Co-Authors: Qiang-hua Zhang, Jiali Gu, Guo Qiang Chen, Tie Ling Xing
    Abstract:

    A hybrid silica sol was prepared via sol gel method using tetraethoxysilane (TEOS) as a precursor and boric acid (H3BO3) as flame retardant additive and then applied to Silk Fabric. In order to endow Silk Fabric with durable flame retardancy, 1,2,3,4-butanetetracarboxylic acid (BTCA) was used as cross-linking agent for the sake of strong linkage formation between the hybrid silica sol and Silk Fabric. The FT-IR and XPS analysis demonstrated the Si-O-B formation in the sol system, as well as the linkage between the sol and Silk after the treatment. The limiting oxygen index (LOI) and smoke density test indicated good flame retardancy and smoke suppression of the treated Silk Fabrics. The micro calorimeter combustion (MCC) test and thermo gravimetric (TG) analysis showed that the treated samples had less weight loss in the high temperature and lower heat release rate when burning. The washing durability evaluation results indicated that there was a distinct improvement for the Silk samples treated with BTCA even after 30 times washing. In addition, the influence of the processing order of BTCA and silica sol treatment on the limiting oxygen index (LOI) of the finished Silk Fabric was also investigated. And the results demonstrated that the sample treated with BTCA first and then with the silica sol exhibited better LOI value (32.3%) than that of the sample by the conversed treatment order. Moreover the tensile property of treated samples was nearly unchanged, but the handle of sol treated samples obviously decreased.

  • Formaldehyde-Free Flame Retardancy Finishing of Silk Fabric with an Organophosphorus Oligomer
    Advanced Materials Research, 2011
    Co-Authors: Jin Ping Guan, Guo Qiang Chen
    Abstract:

    In this paper, a hydroxyl-functional organophosphorus oligomer (HFPO) was introduced as a formaldehyde-free flame retardant into Silk Fabric, using 1, 2, 3, 4-butanetetracarboxylic acid (BTCA) as crosslinking agent. But HFPO bonded onto Silk Fabric is not theoretically increased with the increase of BTCA concentration. Triethanolamine (TEA) was applied to improve the HFPO fixation onto Silk Fabric. The paper still evaluated the flammability and physical properties of the Silk Fabric treated with HFPO/BTCA/TEA system. The treated Silk Fabric demonstrated a high level of flame retardancy with modest loss in Fabric tensile strength. Microscale combustion calorimetry(MCC) testing results indicated that HFPO/BTCA/TEA system treated Silk Fabric has much lower heat release rate than that of control Fabric.

  • Treatment of Silk Fabric Using Doscorea Cirrhosa Extract
    Advanced Materials Research, 2011
    Co-Authors: Guo Qiang Chen, Tie Ling Xing, Qing Qing Zhou
    Abstract:

    In order to develop the traditional technique and variety colors of Xiangyunsha, Doscorea Cirrhosa extract was applied on Silk Fabric, and three metal ion agents Fe2+, Zn2+ and Ti4+ were used as post treatment mordant. Different Silk Fabrics with three colors were obtained: black, pale yellow and orange yellow. And metal salt post treatment also increased the color fastness of finished Fabric. The optimal technological conditions were achieved through orthogonal experiments. The washing fastness of three metal salts treated Fabrics was measured. The staining fastness was good, but the fading fastness was medium. Among of the three mordants treated Fabrics, the washing fastness of Zn2+ post treated Fabric was the best. Crocking fastness and sunlight fastness of Doscorea Cirrhosa treated Silk Fabric could be improved by metal salt treatment. The UV-resistant property of Silk Fabric was improved to an encouraging level, which benefited the Silk cloth especially because Silk was commonly applied for summer wear. And the gas permeability of treated sample was acceptable.

Tie Ling Xing - One of the best experts on this subject based on the ideXlab platform.

  • Synergistic Effects and Mechanism of Modified Silica Sol Flame Retardant Systems on Silk Fabric
    MDPI AG, 2018
    Co-Authors: Chun Liu, Tie Ling Xing, Bingju Wei, Guo Qiang Chen
    Abstract:

    The nano-silica sol was prepared by sol-gel method, and the boric acid, urea, cyanoguanidine, melamine cyanurate (MCA), 1-hydroxyethane 1,1-diphosphonic acid (HEDP), and 6H-dibenz (C,E) (1,2) oxaphosphorin-6-oxide (DOPO) were added to the silica sol to modify the flame retardant through physical doping and chemical bonding. According to the formula proposed by Lewin, the calculation of flammability parameters were obtained by the limiting oxygen index meter, the micro calorimeter, the vertical burner, and the thermogravimetric analyzer proved that there was a synergistic or additive effect between the B/N/P flame retardant and the silica sol. Fourier transform infrared (FT-IR) spectrum, scanning electron microscopy, and pyrolysis gas chromatography-mass spectrometry were used to characterize the morphology, structure, and pyrolysis products of treated Silk Fabric and residues after combustion. The results show that the flame retardancy of silica-boron sol is mainly caused by endothermic reaction and melt covering reaction. Silicon-nitrogen sol acts as a flame retardant through endothermic reaction, release of gases, and melting coverage. Silicon-phosphorus sol achieves flame retardancy by forming an acid to promote formation of a carbon layer and melting coverage. Silica sol and other flame retardants show excellent flame retardanty after compounding, and have certain complementarity, which can balance the dosage, performance, and cost of flame retardants, and is more suitable for industrial development

  • Flame Retardant Finish of Silk Fabric with Dimethyl Phosphonate Doped Silica Sol
    Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016), 2016
    Co-Authors: Qiang-hua Zhang, Guo Qiang Chen, Wei Zhang, Tie Ling Xing
    Abstract:

    In this paper, a dimethyl phosphonate doped (P-doped) silica sol was prepared from a tetraethyl silicate inorganic precursor and applied to Silk Fabric as a flame retardant finish through the sol-gel process. The X-ray photoelectron spectroscopy (XPS) analysis and scanning electron microscope (SEM) images indicated a phosphorus-containing silica network successfully formed on the Silk Fabric surface. The flammability of the treated Silk Fabric was investigated by the limiting oxygen index (LOI) and vertical combustion test. The results indicated that the treated Silk Fabric were flame retardant with a higher limiting oxygen index (LOI) and shorter damage length. Moreover, micro calorimeter combustion testing and thermal gravimetric analysis indicate 50% of P-doped silica sol treated Silk Fabric exhibited a lower heat release rate and higher char residue, which demonstrates a synergistic effect between the silica and phosphorus.

  • Durable flame retardant finish for Silk Fabric using boron hybrid silica sol
    Applied Surface Science, 2016
    Co-Authors: Qiang-hua Zhang, Jiali Gu, Guo Qiang Chen, Tie Ling Xing
    Abstract:

    A hybrid silica sol was prepared via sol gel method using tetraethoxysilane (TEOS) as a precursor and boric acid (H3BO3) as flame retardant additive and then applied to Silk Fabric. In order to endow Silk Fabric with durable flame retardancy, 1,2,3,4-butanetetracarboxylic acid (BTCA) was used as cross-linking agent for the sake of strong linkage formation between the hybrid silica sol and Silk Fabric. The FT-IR and XPS analysis demonstrated the Si-O-B formation in the sol system, as well as the linkage between the sol and Silk after the treatment. The limiting oxygen index (LOI) and smoke density test indicated good flame retardancy and smoke suppression of the treated Silk Fabrics. The micro calorimeter combustion (MCC) test and thermo gravimetric (TG) analysis showed that the treated samples had less weight loss in the high temperature and lower heat release rate when burning. The washing durability evaluation results indicated that there was a distinct improvement for the Silk samples treated with BTCA even after 30 times washing. In addition, the influence of the processing order of BTCA and silica sol treatment on the limiting oxygen index (LOI) of the finished Silk Fabric was also investigated. And the results demonstrated that the sample treated with BTCA first and then with the silica sol exhibited better LOI value (32.3%) than that of the sample by the conversed treatment order. Moreover the tensile property of treated samples was nearly unchanged, but the handle of sol treated samples obviously decreased.

  • Preparation, Structure and Properties of ε–Polylysine Grafted Silk Fabric with Laccase
    Advanced Materials Research, 2013
    Co-Authors: Feng Yu Guo, Mu Ying Yang, Ya Cao, Tie Ling Xing
    Abstract:

    Silk Fabric was treated with laccase and then grafted by epolylysine (ePLL). The optimal enzymatic reaction condition was investigated through the change of dissolved oxygen concentration during the enzymatic reaction. The results of amino acid analysis and SEM of finished Silk Fabrics indicated that the ePLL was grafted onto Silk Fabrics. Differential scanning calorimetry indicated that the thermal stability performance of the finished Fabric was slightly improved. The crease resistance of the finished Silk increased, especially the wet wrinkle resistance property of the finished Silk Fabric was significantly improved. The gas permeability, strength and whiteness slightly decreased, which hardly impact the wearability of the Fabric.

  • Treatment of Silk Fabric Using Doscorea Cirrhosa Extract
    Advanced Materials Research, 2011
    Co-Authors: Guo Qiang Chen, Tie Ling Xing, Qing Qing Zhou
    Abstract:

    In order to develop the traditional technique and variety colors of Xiangyunsha, Doscorea Cirrhosa extract was applied on Silk Fabric, and three metal ion agents Fe2+, Zn2+ and Ti4+ were used as post treatment mordant. Different Silk Fabrics with three colors were obtained: black, pale yellow and orange yellow. And metal salt post treatment also increased the color fastness of finished Fabric. The optimal technological conditions were achieved through orthogonal experiments. The washing fastness of three metal salts treated Fabrics was measured. The staining fastness was good, but the fading fastness was medium. Among of the three mordants treated Fabrics, the washing fastness of Zn2+ post treated Fabric was the best. Crocking fastness and sunlight fastness of Doscorea Cirrhosa treated Silk Fabric could be improved by metal salt treatment. The UV-resistant property of Silk Fabric was improved to an encouraging level, which benefited the Silk cloth especially because Silk was commonly applied for summer wear. And the gas permeability of treated sample was acceptable.

Fengxuan Han - One of the best experts on this subject based on the ideXlab platform.

  • woven Silk Fabric reinforced Silk nanofibrous scaffolds for regenerating load bearing soft tissues
    Acta Biomaterialia, 2014
    Co-Authors: Fengxuan Han, Sidi Liu, Xi Liu, Y Pei, Shumeng Bai, H Zhao, David L Kaplan, Hesun Zhu
    Abstract:

    Although three-dimensional (3-D) porous regenerated Silk scaffolds with outstanding biocompatibility, biodegradability and low inflammatory reactions have promising application in different tissue regeneration, the mechanical properties of regenerated scaffolds, especially suture retention strength, must be further improved to satisfy the requirements of clinical applications. This study presents woven Silk Fabric-reinforced Silk nanofibrous scaffolds aimed at dermal tissue engineering. To improve the mechanical properties, Silk scaffolds prepared by lyophilization were reinforced with degummed woven Silk Fabrics. The ultimate tensile strength, elongation at break and suture retention strength of the scaffolds were significantly improved, providing suitable mechanical properties strong enough for clinical applications. The stiffness and degradation behaviors were then further regulated by different after-treatment processes, making the scaffolds more suitable for dermal tissue regeneration. The in vitro cell culture results indicated that these scaffolds maintained their excellent biocompatibility after being reinforced with woven Silk Fabrics. Without sacrifice of porous structure and biocompatibility, the Fabric-reinforced scaffolds with better mechanical properties could facilitate future clinical applications of Silk as matrices in skin repair.

Hesun Zhu - One of the best experts on this subject based on the ideXlab platform.

  • woven Silk Fabric reinforced Silk nanofibrous scaffolds for regenerating load bearing soft tissues
    Acta Biomaterialia, 2014
    Co-Authors: Fengxuan Han, Sidi Liu, Xi Liu, Y Pei, Shumeng Bai, H Zhao, David L Kaplan, Hesun Zhu
    Abstract:

    Although three-dimensional (3-D) porous regenerated Silk scaffolds with outstanding biocompatibility, biodegradability and low inflammatory reactions have promising application in different tissue regeneration, the mechanical properties of regenerated scaffolds, especially suture retention strength, must be further improved to satisfy the requirements of clinical applications. This study presents woven Silk Fabric-reinforced Silk nanofibrous scaffolds aimed at dermal tissue engineering. To improve the mechanical properties, Silk scaffolds prepared by lyophilization were reinforced with degummed woven Silk Fabrics. The ultimate tensile strength, elongation at break and suture retention strength of the scaffolds were significantly improved, providing suitable mechanical properties strong enough for clinical applications. The stiffness and degradation behaviors were then further regulated by different after-treatment processes, making the scaffolds more suitable for dermal tissue regeneration. The in vitro cell culture results indicated that these scaffolds maintained their excellent biocompatibility after being reinforced with woven Silk Fabrics. Without sacrifice of porous structure and biocompatibility, the Fabric-reinforced scaffolds with better mechanical properties could facilitate future clinical applications of Silk as matrices in skin repair.

Qiang-hua Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Flame Retardant Finish of Silk Fabric with Dimethyl Phosphonate Doped Silica Sol
    Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016), 2016
    Co-Authors: Qiang-hua Zhang, Guo Qiang Chen, Wei Zhang, Tie Ling Xing
    Abstract:

    In this paper, a dimethyl phosphonate doped (P-doped) silica sol was prepared from a tetraethyl silicate inorganic precursor and applied to Silk Fabric as a flame retardant finish through the sol-gel process. The X-ray photoelectron spectroscopy (XPS) analysis and scanning electron microscope (SEM) images indicated a phosphorus-containing silica network successfully formed on the Silk Fabric surface. The flammability of the treated Silk Fabric was investigated by the limiting oxygen index (LOI) and vertical combustion test. The results indicated that the treated Silk Fabric were flame retardant with a higher limiting oxygen index (LOI) and shorter damage length. Moreover, micro calorimeter combustion testing and thermal gravimetric analysis indicate 50% of P-doped silica sol treated Silk Fabric exhibited a lower heat release rate and higher char residue, which demonstrates a synergistic effect between the silica and phosphorus.

  • Durable flame retardant finish for Silk Fabric using boron hybrid silica sol
    Applied Surface Science, 2016
    Co-Authors: Qiang-hua Zhang, Jiali Gu, Guo Qiang Chen, Tie Ling Xing
    Abstract:

    A hybrid silica sol was prepared via sol gel method using tetraethoxysilane (TEOS) as a precursor and boric acid (H3BO3) as flame retardant additive and then applied to Silk Fabric. In order to endow Silk Fabric with durable flame retardancy, 1,2,3,4-butanetetracarboxylic acid (BTCA) was used as cross-linking agent for the sake of strong linkage formation between the hybrid silica sol and Silk Fabric. The FT-IR and XPS analysis demonstrated the Si-O-B formation in the sol system, as well as the linkage between the sol and Silk after the treatment. The limiting oxygen index (LOI) and smoke density test indicated good flame retardancy and smoke suppression of the treated Silk Fabrics. The micro calorimeter combustion (MCC) test and thermo gravimetric (TG) analysis showed that the treated samples had less weight loss in the high temperature and lower heat release rate when burning. The washing durability evaluation results indicated that there was a distinct improvement for the Silk samples treated with BTCA even after 30 times washing. In addition, the influence of the processing order of BTCA and silica sol treatment on the limiting oxygen index (LOI) of the finished Silk Fabric was also investigated. And the results demonstrated that the sample treated with BTCA first and then with the silica sol exhibited better LOI value (32.3%) than that of the sample by the conversed treatment order. Moreover the tensile property of treated samples was nearly unchanged, but the handle of sol treated samples obviously decreased.