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Murty, K . L .,Mathew, M . D .,Haggag, F . M . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
Tensile, creep, and automated ball indentation (ABI) tests have been conducted to study deformation mechanisms in Sn5%Sb alloy between ambient and 473 K. A power law relationship was obtained between minimum creep rate and applied stress, with stress exponent, n=5 and activation energy, Q=12.6±1.1 kCal/mole. At 473 K, a transition from n=5 to n=3 was observed at low stresses. ABI tests showed a power law relationship between strain rate and ultimate tensile stress with values of n=5 and Q=13.0±1.8 kcal/mole. Tensile results were in broad agreement with the creep and ABI data. A new deformation mechanism is proposed for the n=5 region involving viscous glide of dislacations assisted by dislocatian care diffusion.
Evaluation of Comfort Attributes of Polyester Knitted Fabrics Treated with Sericin
R. F. El-Newashy,S. Mowafi,K. Haggag,M. Abou Taleb,H. El-Sayed 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
This work was adopted to study the effect of sericin-containing bath on the different structures of knitted polyesterfabrics to improve some of their comfort attributes. Without appreciable deterioration in its inherent properties, the differentstructures of treated polyester fabric exhibited induced hydrophilicity, enhanced electrical conductivity, improved resistanceto ultraviolet radiation and better water vapour permeability. Five knitted polyester fabrics of different structures weresaponified by sodium hydroxide to create carboxylate ions along their macromolecules, and then treated by sericin withinfreshly discharged bath from degumming of raw natural silk. Treatment of polyester fabrics with sericin was carried out inpresence and absence of glutardialdehyde as a crosslinking agent between polyester and sericin macromolecules. Differentthermo-physiological parameters of comfort; namely thermal conductivity/resistivity, air/water permeability, release ofelectrostatic charges, ultraviolet protection factor, and water vapour transmission of the sericin-treated as well as untreatedknitted fabrics were assessed. The mechanism of interaction between knitted polyester fabric and sericin in presence ofglutardialdehyde was proposed. Scanning electron microscopy was used to ascribe any alteration in the fibre morphology. The change in the fabric crystallinity was investigated using X-ray diffraction pattern. The burst strength, bending stiffnessand yellowing index of the treated fabrics were in the acceptable range.
Imparting Durable Ultraviolet Protection to Polyamide 6 Fabric
H. El-Sayed,A. Abou El-Kheir,L. K. El-Gabry,K. Haggag 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
Deterioration of polyamide 6 fabrics upon exposure to ultraviolet radiation for a long time is an acute dilemma. Imparting ultraviolet protection to polyamide fabrics is of prime importance from the performance and economic point ofviews. In this investigation, polyamide 6 fabrics were modified with an environmentally friendly product (sericin) in presenceor absence of crosslinking agents; namely citric acid or epichlorohydrin using pad-dry-cure technique. Topographicalinvestigation of the used sericin powder was conducted using transmission electron microscopy (TEM). The morphologicalstructure of treated as well as untreated fabrics was investigated using high resolution field emission scanning electronmicroscope (FE-SEM). The alteration in some physico-mechanical characteristics of the treated polyamide 6 fabrics; Viz. bending stiffness, burst test, degree of yellowness, and moisture regain were assessed. The treated polyamide fabrics weredyed with acid and reactive dyestuffs. The colour strength and washing fastness for dyed fabrics with both acid and reactivedyes were assessed. The photo-protection against UV light of the said fabrics were evaluated. The treated fabric exhibitedexcellent UV protection without significant discrepancy in their inherent physico-mechanical properties.