NOPR Collection:

Effect of Adhesion on the Mechanical Properties of Glass Fibre Reinforced Thermoplastics

2016-07-20T05:58:48Z

Title: Effect of Adhesion on the Mechanical Properties of Glass Fibre Reinforced Thermoplastics Authors: Singh, K; Ahmad, H; Lall, V K Abstract: Adhesion of glass fibres to thermoplastics and its effect on the tensile strength of the composite materials has been studied. Scanning electron microscopy was used to assess the degree of adhesion of glass fibres to the polymer matrix. It has been found that good adhesion of glass fibre to nylon-6 in comparison to polypropylene and acrylonitrile butadiene styrene plastics results in better tensile strength behaviour of the composite materials. Page(s): 148-152

Studies on Azo Compounds: Part VII-Protonation Constants and Kinetics of Some Thiazole Azo and Azomethine Dyes

2016-07-20T05:57:47Z

Title: Studies on Azo Compounds: Part VII-Protonation Constants and Kinetics of Some Thiazole Azo and Azomethine Dyes Authors: Etaiw, S H; El-Hefnawey, G B; Abdel-Salam, M E Abstract: The protonation (pk_p) and ionization (pk_a) constants of some thiazole azo and azomethine dyes were determined in aqueous universal buffer solutions of varying pH values at 25±0.1^oC and at ion strength of 0.1 using the spectrophotometric method. Protonation occurs on the imino nitrogen atom of the thiazole nucleus and it is affected by the nature of the substituents. The rate of protonation of azomethine dyes is slower than that of thiazole azo dyes; therefore, the rate constants of azomethine dyes were evaluated. The order of protonation is 1.5. Page(s): 143-147

Influence of Relative Humidity on the Bundle Tenacity of Wool Fibres

2016-07-20T05:56:50Z

Title: Influence of Relative Humidity on the Bundle Tenacity of Wool Fibres Authors: Iyer, K R Krishna; Ananthakrishnan, K V Abstract: The bundle tenacity at 0 in gauge length has been determined for ten samples of wool using the Stelometer at 20, 40, 65, 80 and 96% relative humidities (RH). From the data obtained, a regression formula has been worked out, so that the bundle tenacity at the standard RH of 65% can be estimated from the tenacity determined at any ambient condition. The tenacity is, in general, found to decrease at the rate of about 0.5% of its value extrapolated to 0%, RH for every unit rise in RH%. When the effect of weight increase due to moisture sorption is eliminated from the observed tenacity, the above rate is found to decrease to about 0.3%. Page(s): 140-142

Relationship between Stress-Strain Parameters and Fibre Characteristics in Wools

2016-07-20T05:55:23Z

Title: Relationship between Stress-Strain Parameters and Fibre Characteristics in Wools Authors: Parthasarathy, S; Bapna, D L; Patni, P C Abstract: Regression of stress-strain parameters, like hookean slope yield slope and breaking stress and strain on fibre characteristics, like diameter, CV of diameter area and CV of area has been studied. It is observed that it is not possible to obtain a single linear regression equation for pure and medullated wool fibres. Page(s): 138-139