Effect of Gamma Irradiation Crosslinking on PA6 Fibers

2012 ◽  
Vol 476-478 ◽  
pp. 2280-2283
Author(s):  
Shi Feng Zhu ◽  
Mei Wu Shi ◽  
Guo Liang Dai
Keyword(s):  
Gamma Irradiation ◽  
Melting Temperature ◽  
Breaking Strength ◽  
Absorbed Dose ◽  
Onset Temperature ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Irradiation Dosage

Gamma irradiation crosslinking of nylon6 fibers with and without the presence of triallyl cyanurate(TAC) was studied, XRD、DSC、IR and TG were used to analyze the effects of irradiation crosslinking on structure and properties of PA6 fibers. The melt-drip performance of PA6 fibers was improved after irradiation crosslinking. The breaking strength increased first then decreased as a function of absorbed dose, while elongation at break decreased. The melting temperature and crystallinity decreased with increasing the dose. Besides, the onset temperature of degradation fell slightly and the amount of non-volatile residue at 600oC increased as the irradiation dosage increased.

Structure and Properties of Cotton Grafted Using Trifluoroethyl Methacrylate via ATRP Method

2013 ◽  
Vol 796 ◽  
pp. 364-369
Author(s):  
Shi Wei Li ◽  
Tie Ling Xing ◽  
Zhan Xiong Li ◽  
Guo Qiang Chen
Keyword(s):  
Cotton Fabric ◽  
Breaking Strength ◽  
Water Repellency ◽  
Structure And Properties ◽  
Elongation At Break ◽  
Significant Difference ◽  
Surface Contact Angle ◽  
Ft Ir ◽  
Water Repellence ◽  
Better Than

In this work, cotton was grafted with trifluoroethyl methacrylate (TFEMA) via atom transfer radical polymerization (ATRP) in water aqueous. The appearance of the cotton fabric was characterized with SEM, and SEM of the grafted cotton displayed significant difference from the ungrafted cotton. FT-IR indicated that TFEMA was successfully grafted onto surface of cotton fibers. Surface contact angle test and water repellency rating test showed that the water repellence of the modified cotton fabric were better than the ungrafted cotton fabric. Compared with the ungrafted cotton fabric, the whiteness, air permeability, breaking strength and elongation at break of the grafted cotton fabric decreased slightly. Grafted treatment led to efficient implantation of fluorine atoms on the surface of cotton fabric, this resulted in water repellence without altering the bulk properties of the cotton fabric.

Degradation study of polyester fiber in swimming pool water

2020 ◽  
Vol 91 (1-2) ◽  
pp. 51-61
Author(s):  
Caroline Apoloni Cionek ◽  
Catia Nunes ◽  
Adonilson Freitas ◽  
Natalia Homem ◽  
Edvani Muniz ◽  
...  
Keyword(s):  
Weight Loss ◽  
Young’S Modulus ◽  
Melting Temperature ◽  
Young's Modulus ◽  
Onset Temperature ◽  
Swimming Pool ◽  
Experimental Methodology ◽  
Stress Tests ◽  
Pool Water ◽  
Swimming Pool Water

The disinfection of swimming pool water is vital to maintain water quality. The chemicals used in this practice can damage the fabrics of bathing suits and shorten the shelf life of the textile substrate. The degradation of polyester, a polymer that is widely used in bathing suits for swimming pools, was investigated. For this, a 23 factorial design was employed for the experimental methodology. The effect of several variables was analyzed in a simulated swimming pool batch, such as textile-exposure time, concentration of the used disinfection product, and batch temperature. The response variables were enthalpy of fusion ΔHm, melting temperature and crystallinity (obtained by differential scanning calorimetry), percentage of weight loss, temperature of maximum rate of weight loss, onset temperature and endset temperature (measured through thermogravimetric analysis), and Young's modulus values (measured in strain-stress tests in the row and column directions). The factors of temperature, time, and the concentration of disinfectant were significant for melting temperature, crystallinity, onset temperature, and Young's modulus for columns. The analyses of variance were obtained using software Design-Expert DX7. Attenuated total reflectance-Fourier transform infrared spectroscopy analysis showed changes in band intensities at 695 cm−1, which were attributed to ester groups, as well as a decrease of the carbonyl band at 1712 cm−1, which was attributed to the hydrolysis of the material. Analysis through scanning electronic microscopy images showed the appearance of stretch marks in the constituent filaments of the tested textiles, which suggests a surface degradation occurred.

The effect of gamma irradiation on the structure and properties of ester-ether elastomers

Polimery ◽  
1991 ◽  
Vol 36 (01) ◽  
pp. 18-22 ◽  
Author(s):  
IVO KLIER ◽  
ZBIGNIEW ROSLANIEC ◽  
VRATISLAV DUCHACEK
Keyword(s):  
Gamma Irradiation ◽  
Structure And Properties

Structure and Properties of Double-Filament Tri-Component Combined Yarn

2014 ◽  
Vol 1035 ◽  
pp. 101-105
Author(s):  
Yi Qiang Gao
Keyword(s):  
Abrasion Resistance ◽  
Manufacturing Process ◽  
Breaking Strength ◽  
Structure And Properties ◽  
Breaking Elongation ◽  
Yarn Properties ◽  
Yarn Structure ◽  
Yarn Hairiness

Manufacturing process of combined yarn with different filament size and cotton roving has been discussed. It shows that filament feeding point has some effect on combined yarn structure and yarn properties. If the filaments are fed from different sides of the cotton strand, they usually wrap the strand in parallel. If the filaments are fed from the same side of the strand, they wrap the strand crossed more often. Filament feeding point has an effect on yarn hairiness while it affects yarn breaking strength, yarn breaking elongation and abrasion resistance slightly. Yarn property weight is determined by subjective empowerment and Borda method is used to analyze yarn property. It has proved that if the filaments are fed from different sides of the cotton strand, the filament-roving space is set at 4mm respectively; the combined yarn shows the best.

Analysis of the Stability of POY Filament Structure and Properties Spun by WINGS System

2012 ◽  
Vol 430-432 ◽  
pp. 83-87
Author(s):  
Bin Yang ◽  
Zhi Yong Yan ◽  
Yuan Xue
Keyword(s):  
Crystal Orientation ◽  
Boiling Water ◽  
Shrinkage Rate ◽  
Structure And Properties ◽  
Orientation Degree ◽  
Elongation At Break ◽  
Filament Structure ◽  
Initial Modulus ◽  
The Stability ◽  
Experimental Values

Comparing the crystal orientation of the structure, tensile properties, boiling water shrinkage rate between difference filament rolls in the same spinning position spun by WINGS POY system and tradition ACW POY system, it is found that there are differences in orientation degree, crystallinity, tensile strength, elongation at break, initial modulus and boiling water shrinkage rate between difference filament rolls in the same spinning position. Coefficient of variation of the experimental values of WINGS POY system is lower than traditional ACW POY system.

Effects of physical preservation methods on sclerotial germination in Aspergillus flavus and Aspergillus ochraceus in stored grain

1992 ◽  
Vol 70 (6) ◽  
pp. 1206-1210 ◽  
Author(s):  
M. Menasherov ◽  
N. Paster ◽  
R. Nitzan
Keyword(s):  
Gamma Irradiation ◽  
Aspergillus Flavus ◽  
Combined Treatment ◽  
Aspergillus Ochraceus ◽  
Combined Treatments ◽  
Stored Grain ◽  
Modified Atmospheres ◽  
Irradiation Dosage ◽  
Different Levels ◽  
Sclerotial Germination

Germination of sclerotia of Aspergillus flavus and Aspergillus ochraceus was assessed following gamma irradiation during exposure to different levels of relative humidities or to various modified atmospheres. The effect of combined treatments on germination was also studied. No sclerotia of either fungi germinated following irradiation with 2.5 kGy. At 80% relative humidity, germination was almost completely inhibited during 50 days of exposure. Sclerotia of A. flavus were found to tolerate higher levels of CO2 than those of A. ochraceus, and 100% germination of the former, but not the latter, occurred at 80% CO2 (given with either 20 or 5% O2). Germination of A. flavus sclerotia was markedly reduced only at modified atmospheres of 40% CO2 and 1% O2. Working with two sublethal dosages of gamma irradiation, 1.0 and 1.5 kGy, it was demonstrated that less CO2 was needed in the atmosphere (with 20% O2) to reduce germination as the irradiation dosage increased. The advantages of the combined treatment compared with each treatment applied alone are discussed. Key words: sclerotia, germination, Aspergillus, inhibition, physical methods.

Biomimetic Hemocompatible Nanofibrous Scaffolds as Potential Small-Diameter Blood Vessels by Bilayering Electrospun Technique

2011 ◽  
Vol 306-307 ◽  
pp. 1627-1630 ◽  
Author(s):  
He Yun Wang ◽  
Ya Kai Feng ◽  
Hai Yang Zhao ◽  
Ruo Fang Xiao ◽  
Jin Tang Guo
Keyword(s):  
Mechanical Properties ◽  
Blood Vessel ◽  
Breaking Strength ◽  
Small Diameter ◽  
Matrix Structure ◽  
Complex Matrix ◽  
Elongation At Break ◽  
Artificial Blood ◽  
Nanofibrous Scaffolds ◽  
Morphology And Mechanical Properties

In this paper, we prepared a scaffold composed of a polyurethane (PU) fibrous outside-layer and a gelatin-heparin fibrous inner-layer with mimicking morphology and mechanical properties of a native blood vessel by sequential bilayering electrospinning technology on a rotating mandrel-type collector. The scaffolds achieved the appropriate breaking strength (3.7 ± 0.13 MPa) and elongation at break (110 ± 8%). When the scaffolds were immersed in water for 1 h, the breaking strength decreased slightly to 2.2 ± 0.3 MPa, but the elongation at break increased up to 145 ± 21%. Heparin was released from the scaffolds at substantially uniform rate until the 9th day. The scaffolds were expected to mimic the complex matrix structure of native arteries, and had good hemocompatibility as an artificial blood vessel owing to the heparin release.

Effects of electron beam irradiation on structure and properties of ultra-high molecular weight polyethylene fiber

2017 ◽  
Vol 47 (6) ◽  
pp. 1357-1377 ◽  
Author(s):  
Dongliang Dai ◽  
Meiwu Shi
Keyword(s):  
Molecular Weight ◽  
Electron Beam ◽  
High Molecular Weight ◽  
Electron Beam Irradiation ◽  
Breaking Strength ◽  
Beam Irradiation ◽  
Elongation At Break ◽  
Gel Content ◽  
Ultra High Molecular Weight ◽  
Polyethylene Fibers

This study introduced trimethylolpropane trimethacrylate into ultra-high molecular weight polyethylene fibers through supercritical CO2 pretreatment before the fibers were irradiated under an electron beam. Significant differences, emerging in the ultra-high molecular weight polyethylene fibers’ gel content, mechanical properties, and creep property according to their different irradiation doses, were studied through one-way analysis of variance. Regression equations were established between the irradiation dose and the gel content, breaking strength, elongation at break, and creep rate by regression analysis. A reasonable irradiation dosage range was determined after a verification experiment and the impact trends were analyzed; additionally, the sensitized irradiation crosslinking mechanism of ultra-high molecular weight polyethylene fibers was preliminarily examined. Then the surface morphology, chemical structures, thermal properties, and crystal properties of treated ultra-high molecular weight polyethylene fibers were measured. The results showed that as the irradiation dose increased, the gel content first rose and then declined; the breaking strength decreased continuously; the elongation at break increased at first and then decreased; and the creep rate originally fell and then rose before finally declining slowly. Electron beam irradiation had a significant etching effect on the fibers’ surface, and both the melting point and crystallinity decreased slightly.

Research of the Effects on a Nuclear Cable Material Irradiated by Beta/Gamma Irradiation

2013 ◽  
Author(s):  
Weixia Zhong ◽  
Jiansheng Sun ◽  
Jinping Liu ◽  
Ping Sun
Keyword(s):  
Activation Energy ◽  
Glass Transition ◽  
Gamma Radiation ◽  
Gamma Irradiation ◽  
Irradiation Dose ◽  
Loss Modulus ◽  
Absorbed Dose ◽  
Transition Process ◽  
Gamma Irradiated ◽  
Movement Unit

In this paper, irradiated samples by different irradiation doses of the beta/gamma radiation from a selected nuclear cable material, which were studied by tensile machine, DSC and DMTA. The research results show that the elongation at break (EAB) drops with absorbed dose of beta/gamma radiation and at the same dose the EAB drop for beta-irradiated samples is higher than that for gamma-irradiated samples, which means that this material becomes more brittler with more irradiation. The OITP value for the irradiated samples exhibits pronounced drop with absorbed beta/gamma irradiation dose. And moreover, the OITP value of these gamma irradiated samples drops faster than that of those beta irradiated samples. DMTA researches show that the storage modulus (E′) and the loss factor (tanδ = E″/E′, E″ represents the loss modulus) of the irradiated samples present higher values with the increase dose of beta /gamma radiation. It is interest that the E′ behaves firstly an increase, then decreases by rising the temperature within the temperature range of −30–20 °C, and this trend becomes pronounced with increase of irradiation dose, combined with the activation energy, correspond to the glass transition process, for all the irradiated samples which hints that the glass transition process may be hindered in terms of a higher activation energy, but the movement unit could be smaller with a lower Tg, as a result of the beta/gamma irradiation.

Sign in / Sign up

Export Citation Format

Share Document