Application of Sericin in Anti-Crease Finishing of Silk Fabric

2014 ◽  
Vol 707 ◽  
pp. 64-68
Author(s):  
Lei Xu
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Sodium Hypophosphite ◽  
Cross Linking ◽  
Silk Fabric ◽  
Solvent Viscosity ◽  
Wrinkle Resistance ◽  
Integration Test ◽  
Finishing Agent ◽  
Recovery Angle

It is of perfect anti-crease effect that using sericin finishing agent in finishing of silk fabric. Analyzed integration test of wrinkle resistance of silk fabric, the optimally applied parameters are obtained as follows, the dosage of sericin is 15g/L, the concentration of TEA is 8g/L, twice dip and twice rolling, drying, baking in 3 minutes at 150 °C. The wrinkle recovery angle has been increased obviously after sericin finishing. Also the performance of anti-crease resistance can be improved effectively by adding 3g/L of sodium hypophosphite. The phenomena of increased solvent viscosity and activation energy of thermal decomposition were shown that the cross-linking structure were formed in the fiber with the using of sericin finishing, thereby the wrinkle resistance of the fabric was improved. Sericin finishing agent can increased the wrinkle resistant properties of fabrics effectively.

THE THERMAL DECOMPOSITION OF STYRENE–BUTADIENE POPCORN POLYMER

1950 ◽  
Vol 28b (1) ◽  
pp. 5-16
Author(s):  
C. A. Winkler ◽  
J. Halpern
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Linear Relation ◽  
Frequency Factor ◽  
Thermal Reaction ◽  
Cross Linking ◽  
First Order ◽  
Bond Scission ◽  
Styrene Butadiene ◽  
Kinetics Of

At temperatures of the order of 250 °C., popcorn polymer undergoes decomposition to soluble polymer. The reaction is catalyzed by peroxides present in the popcorn when the latter is formed. These peroxides may be removed by extracting the polymer with benzene. The kinetics of both the catalyzed and purely thermal solubilization reactions were investigated. The rates of both reactions are first order, the catalyzed degradation having a higher activation energy and a higher frequency factor. The rate of the thermal reaction decreases and its activation energy increases with increasing butadiene content of the polymer. A linear relation between the activation energy and the log of the frequency factor, for the decomposition of popcorn polymers of different butadiene contents, was observed. The results indicate that the rate of solubilization is determined by the activation energy of the bond scission process, and is independent of the degree of cross-linking of the polymer.

Preparation and Application of Low Molecular Weight Chitosan Nanoparticle as a Textile Finishing Agent

2013 ◽  
Vol 796 ◽  
pp. 92-97 ◽  
Author(s):  
Cheng Wang ◽  
Hong Lin ◽  
Yu Yue Chen ◽  
Yan Hua Lu
Keyword(s):  
Chitosan Nanoparticles ◽  
Low Molecular Weight ◽  
Silk Fabric ◽  
Wrinkle Resistance ◽  
Chitosan Nanoparticle ◽  
Low Molecular Weight Chitosan ◽  
Ft Ir ◽  
Textile Finishing ◽  
Finishing Agent ◽  
Silk Fabrics

Due to the advantages of both the chitosan and the nanomaterial, chitosan nanoparticle has a broad application in a lot of fields, such as medicine carrier, food process, cosmetics and agriculture protect. And there also appears a lot of research about chitosan nanoparticle in textile finishing in recent years. In former research, steady state chitosan nanoparticles were prepared by ionotropic gelation method in dispersion system. In this paper, in order to confirm the preparation of low molecular weight chitosan nanoparticle, it was also characterized by Fourier Transform Infrared (FT-IR) Spectrometry, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). Focusing on the application value, chitosan nanoparticles dispersion solution were used as one kind of textile finishing agent to modifyB.morisilk fabrics in order to realize the functionalization of silk fabrics. The wrinkle resistance and bacteria repellency of silk fabrics were tested in the paper. The results showed that chitosan nanoparticles were successfully prepared and confirmed accrording to the XRD, FT-IR and TEM tests. In addition, compared with the ordinaryB. morisilk fabric and theB. morisilk fabric treated with chitosan accordingly, theB. morisilk fabrics treated with chitosan nanoparticle dispersion system had better wrinkle resistance and bacteria repellency.

Citric acid as environment friendly crease-resistance finishing agent for silk fabric combined by ß-cyclodextrin

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abolfazl Zare
Keyword(s):  
Citric Acid ◽  
Esterification Reaction ◽  
Cross Linking ◽  
Hydroxyl Groups ◽  
Silk Fabric ◽  
Yellowness Index ◽  
Content Type ◽  
Washing Durability ◽  
Silk Fabrics ◽  
Recovery Angle

Purpose The purpose of this paper is to assess the possibility of cross-linking silk fabric using citric acid (CA) as the cross-linking agent and nano-TiO2 (NTO) particles as a catalyst at low temperature and under UV irradiation. This paper also assesses the possibility of treated samples with suitable combinations of CA and NTO to impart multiple functional properties such as self-cleaning and antimicrobial properties. Design/methodology/approach In this research, ß-cyclodextrin (ß-CD) grafted onto silk fabric using CA as a crosslinking agent and NTO particles as a catalyst through a pad-dry-cure technique and with UVA irradiation. The effects of different concentrations of CA, ß-CD and NTO particles on some properties of the treated samples are evaluated, and the optimum finishing conditions are obtained. The author also investigated the washing durability of the modified product after ten times of washing. Findings The results showed that CA plays the role of a linking agent through an esterification reaction with the hydroxyl groups of both ß-CD and silk fabrics and improves the durability of materials on the textile surface. Also, the silk fabrics treated with CA only were found to have excellent photocatalytic properties and better antibacterial activity than the control sample and the fabrics treated with a mixture of ß-CD/CA. Originality/value This study was conducted to achieve multiple functions such as antibacterial and photocatalytic activities, good dry crease recovery angle and wet crease recovery angle behavior without a significant adverse effect on the Yellowness index and tensile properties for treated silk fabrics.

Application of Calculus Equation in Solving Thermal Decomposition Kinetics Parameters of Flame Retardant Wood

2014 ◽  
Vol 983 ◽  
pp. 190-193
Author(s):  
Cai Yun Sun ◽  
Yong Li Yang ◽  
Ming Gao
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Degradation ◽  
Phosphoric Acid ◽  
Flame Retardant ◽  
Kinetic Parameters ◽  
Flame Retardancy ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Kinetics Parameters

Wood has been treated with amino resins and amino resins modified with phosphoric acid to impart flame retardancy. The thermal degradation of samples has been studied by thermogravimetry (TG) in air. From the resulting data, kinetic parameters for different stages of thermal degradation are obtained following the method of Broido. For the decomposition of wood and flame retardant wood, the activation energy is found to decrease from 122 to 72 kJmol-1.

Activation energy in the thermal decomposition of MgH2 powders by coupled TG–MS measurements

2013 ◽  
Vol 116 (2) ◽  
pp. 865-874 ◽  
Author(s):  
Renzo Campostrini ◽  
Mahmoud Abdellatief ◽  
Matteo Leoni ◽  
Paolo Scardi
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition

scholarly journals Thermodynamics and Kinetic Modeling of the ZnSO4.H2O Thermal Decomposition in the Presence of a Pd/Al2O3 Catalyst

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 548
Author(s):  
Gabriela V. T. Kurban ◽  
Artur S. C. Rego ◽  
Nathalli M. Mello ◽  
Eduardo A. Brocchi ◽  
Rogério C. S. Navarro ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Zinc Sulfate ◽  
Thermodynamic Assessment ◽  
Reaction System ◽  
Decomposition Temperature ◽  
Kinetic Behavior ◽  
Proposed Model ◽  
Al2o3 Catalyst ◽  
Iodine Reaction

The sulfur–iodine thermochemical water-splitting cycle is a promising route proposed for hydrogen production. The decomposition temperature remains a challenge in the process. Catalysts, such as Pd supported on Al2O3, are being considered to decrease reaction temperatures. However, little is known regarding the kinetic behavior of such systems. In this work, zinc sulfate thermal decomposition was studied through non-isothermal thermogravimetric analysis to understand the effect of a catalyst within the sulfur–iodine reaction system context. The findings of this analysis were also related to a thermodynamic assessment. It was observed that the presence of Pd/Al2O3 modified the reaction mechanism, possibly with some intermediate reactions that were suppressed or remarkably accelerated. The proposed model suggests that zinc sulfate transformation occurred in two sequential stages without the Pd-based material. Activation energy values of 238 and 368 kJ.mol−1 were calculated. In the presence of Pd/Al2O3, an activation energy value of 204 kJ.mol−1 was calculated, which is lower than observed previously.

scholarly journals OCCUPATIONAL AND PUBLIC HEALTH. THE WRINKLE RECOVERY ANGLE (WRA) STUDY OF FABRIC THAT NANO-SILVER TREATED

2020 ◽  
Vol 36 (1) ◽  
pp. 3-11
Author(s):  
A. M. Pirzada ◽  
S. Vambol ◽  
Z. Khatri ◽  
A. Aziz ◽  
N. A. Samoon ◽  
...  
Keyword(s):  
Standard Method ◽  
Sleep Disturbances ◽  
Flexural Rigidity ◽  
Test Method ◽  
Cross Linking ◽  
Health State ◽  
Covalent Bonds ◽  
Whiteness Index ◽  
Nano Silver ◽  
Recovery Angle

The constant use of wrinkle-resistant cellulose fabrics in professional and everyday life can negatively affect the health state. This is because formaldehyde vapours, which contribute to allergies, persistent coughing, and irritation of the eyes, nose, and throat, sleep disturbances, headaches, etc., pose a greater danger. In this study an attempt was made to achieve fabric stabilization from wrinkle resistant by formation ionic bonds of as replacement covalent bonds. And this is the main study purpose. Industrially Desized and Bleached 100 % pure cotton fabric with the weight of 110 g/m2, and the chemicals were used. Preparation of cationic glycerine, carboxymethylation of bleached fabric and application of antimicrobial finishes on the ionic cross-linked fabric was provided. Measurements were taken to determine of wrinkle recovery angle (WRA), of absorbency, of whiteness index, of flexural rigidity, of abrasion, of tensile strength. Wrinkle recovery angle was measured by standard method of AATCC 66 (option 2). AATCC Test Method 79-2000 was used to test the absorbency of fabric. The CIE whiteness index was determined using an Xrite Colour Eye 7000A spectrophotometer. Flexural Rigidity was measured through a testing cantilever method ASTM D-1388. Fabric abrasion was checked according to standard method for abrasion resistance of textile fabric ASTM 4966 on Martindale Abrasion Device M235. Mechanical strength of the fabric was measured under the standard method of ASTM D-5034. With the ionic cross-linking, the dry WRA was achieved an optimum of 118º and wet WRA up to 128º with increased fabric strength and whiteness. In addition to ionic cross-linking fabric was treated with Nano silver. Based on the results it was concluded that the fabric can be optimized first with ionic cross-link method and then it can be treated with the antimicrobial making the fabric cleaner and hygienic. This fabric treatment provides the necessary characteristics and is safe for the health of the people who use it.

scholarly journals Improvement of recovered activity and stability of the Aspergillus oryzae β-galactosidase immobilized on duolite A568 by combination of immobilization methods

2017 ◽  
Vol 23 (4) ◽  
pp. 495-506 ◽  
Author(s):  
Larissa Falleiros ◽  
Bruna Cabral ◽  
Janaína Fischer ◽  
Carla Guidini ◽  
Vicelma Cardoso ◽  
...  
Keyword(s):  
Activation Energy ◽  
Aspergillus Oryzae ◽  
Physical Adsorption ◽  
Cross Linking ◽  
Thermal Deactivation ◽  
Order Model ◽  
First Order ◽  
Immobilized Biocatalyst ◽  
The Stability ◽  
Kinetics Of

The immobilization and stabilization of Aspergillus oryzae ?-galactosidase on Duolite??A568 was achieved using a combination of physical adsorption, incubation step in buffer at pH 9.0 and cross-linking with glutaraldehyde and in this sequence promoted a 44% increase in enzymatic activity as compared with the biocatalyst obtained after a two-step immobilization process (adsorption and cross-linking). The stability of the biocatalyst obtained by three-step immobilization process (adsorption, incubation in buffer at pH 9.0 and cross-linking) was higher than that obtained by two-steps (adsorption and cross-linking) and for free enzyme in relation to pH, storage and reusability. The immobilized biocatalyst was characterized with respect to thermal stability in the range 55-65 ?C. The kinetics of thermal deactivation was well described by the first-order model, which resulted in the immobilized biocatalyst activation energy of thermal deactivation of 71.03 kcal/mol and 5.48 h half-life at 55.0 ?C.

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