NOPR Community:

Microwave interactive properties of cotton fabrics coated with carbon nanotubes/polyurethane composite

2013-12-27T16:51:40Z

Title: Microwave interactive properties of cotton fabrics coated with carbon nanotubes/polyurethane composite Authors: Gupta, K K; Abbas, S M; Srivastava, Anurag; Nasim, M; Saxena, A K; Abhyankar, Ashutosh Abstract: In the present study, the inherent characteristic of carbon nanotubes to absorb/attenuate the energy of electromagnetic waves has been exploited. The results indicate that the incorporation of CNTs in the polyurethane matrix has significant effect on the microwave interaction properties. Fabrics are developed through coating process using formulations based on different concentrations of multi –walled carbon nanotubes in polyurethane matrix on two different types of fabrics, i.e. plain weave fabric & mesh fabric (netting). The coated fabrics have been evaluated for microwave interaction properties in X and Ku –band in terms of four parameters, viz. reflection, transmission , absorption, reflection loss, permittivity and surface resistivity of materials. The absorption of upto 40%, permittivity value of 25.0 in frequency range 8.2-12.4 GHz (X- Band) and reflection loss of 5-10 dB in frequency range of 2-18 GHz (X and Ku band) have been observed. Page(s): 357-365

Roughness and frictional properties of cotton and polyester woven fabrics

2013-12-25T16:46:31Z

Title: Roughness and frictional properties of cotton and polyester woven fabrics Authors: Sülar, Vildan; Öner, Eren; Okur, Ayşe Abstract: The roughness and frictional properties of cotton and polyester fabrics and relationship between these properties have been investigated and compared. Two sets of test samples comprising nine cotton and twelve polyester fabrics have been woven by systematically changing parameters such as weave type, weft setting and linear density of weft yarn. The fabric roughness measurements are conducted by using a new surface roughness tester for textile applications and the fabric friction measurements are performed with a friction attachment adaptable to a tensile tester. All the results are statistically evaluated in relation to the structural parameters of the test fabrics by using multivariate variance analyses. The relationship between roughness and frictional properties is examined by correlation analyses. For all the test fabrics, it can be noted that an increase in weft setting causes decrease in fabric roughness values for every weave type and this tendency is in accordance with the fabric friction results. When the relationships between the frictional and roughness values are examined, statistically significant and high correlations are determined for both of the cotton and polyester fabrics. Page(s): 349-356

Studies on kinetic and thermodynamic parameters of natural dye curcumin on PLA fibre

2013-12-23T16:46:59Z

Title: Studies on kinetic and thermodynamic parameters of natural dye curcumin on PLA fibre Authors: Wu, Jihong; Guo, Hui; Ke, Jun; Fan, Jiangtao Abstract: The dyeing kinetics and thermodynamics for PLA fibre dyed with the natural dye curcumin have been studied. The rate of dye uptake, half dyeing time, diffusion coefficient, standard affinity, heat and entropy of dyeing have been determined. Linear isotherms are obtained, suggesting that the mechanism of dyeing is similar to that of disperse dyes. The rate of dye uptake and the total dye uptake increase with the increase in dyeing temperature. Page(s): 424-426

Studies on elastane-cotton core-spun stretch yarns and fabrics: Part II – Fabric low-stress mechanical characteristics

2013-12-25T16:46:27Z

Title: Studies on elastane-cotton core-spun stretch yarns and fabrics: Part II – Fabric low-stress mechanical characteristics Authors: Das, A; Chakraborty, R Abstract: The present paper reports study on the interaction effect of elastane stretch, proportion of elastane core and twist multiplier on tensile and low-stress mechanical properties of woven fabrics made from stretchable elastane-cotton core-spun yarns. A three-variable factorial design technique, proposed by Box & Behnken, has been used to investigate the combined interaction effect of the above variables on various tensile (breaking load and elongation) and low-stress mechanical characteristics (shear rigidity, shear hysteresis, bending rigidity, bending hysteresis, linearity of compression thickness curve, compressional energy, compressional resilience) of fabrics. It has been observed that the tensile and low-stress mechanical characteristics of woven fabrics made from elastane core-spun yarns are significantly influenced by the process parameters. But, no specific trend is observed in breaking elongation of fabrics for any of the process variables. Page(s): 340-348