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Articles by C.J. Chukwu
Total Records ( 2 ) for C.J. Chukwu
  A.I. Ezeribe , C.J. Chukwu , N.A. Obasi , G. Otuchristian and U.A. Ibiam
  Synthesis of mono through hexa substituted derivatives of Methylol Melamine Resins (MFR) were carried out at various catalyst (KH2PO4) concentrations of 0.5, 0.75, 1.0, 1.25 and 1.50 g. Rheological/mechanical properties of resin-cotton network were investigated to determine the effect of catalyst concentration and degree of substitution of resins on the flow property such as viscosity. Other parameters determined include percentage yield, breaking load and crease recovery properties of resinated cotton fabric. The result revealed that the yield increased with increase in catalyst concentration and attained the highest yield of 53.7% at 0.75 g and 51.3% at 1.0 g, respectively. The damaging effects of high acid concentrations were observed particularly at 1.25 and 1.50 g KH2PO4. Yield increased as the degree of substitution increased with hexa substitution having 48.8 and 53.7% at 0.5 and 0.75 g, respectively. Shear viscosity increased as catalyst concentration increased from 0.5 to 1.0 g with hexa and penta substitution giving the highest shear viscosity of 45 poises and 35 poises, respectively. The dry crease recovery angle increased with increased catalyst concentration up to 0.75 g and attained maximum value of 125° and 115° in the warp and weft directions, respectively at 150°C. The effect of catalyst on breaking load of sample at 150°C showed an increase from 0.5-1.0 g of catalyst concentration. The highest tear strength of 10.8 and 10.2 kgf at 0.75 g catalyst concentration was observed in the warp and weft directions, respectively. Acid damage at higher concentration was also implicated for the reduced tear strength.
  A.I. Ezeribe , K.A. Bello , H.M. Adamu , C.J. Chukwu , D.A. Boryo and F. Omizegba
  Bifunctional reactive dyes are coloured compounds that have more than one reactive moiety per molecule or groups capable of forming covalent bonds between carbon atom of the dye ions or molecules and functional groups of the substrate. Synthesis of two dyes “10a and 10b” derived via 4-phenyl-1,3-thiazole-2-amine and 4-(4-bromophenyl-1, 3-thiazole -2 Amine were carried out. Their diazo components were coupled with J-Acid and other coupling components, to obtain the dyes. Spectroscopic studies were investigated to obtain maximum wavelength of absorption (λmax). The effect of time, temperature and pH on percentage exhaustion of dyed cotton fabrics, performance evaluation e.g., Light and wash fastness was ascertained. The result revealed a λmax of 510 and 450 nm for 10a and 10b dyes respectively. Maximum exhaustion of 65 and 70% was reported for both dyes at a pH of 9.5-11 while 50 and 59% exhaustion was recorded in 60 min of dyeing period. The gray scale assessment for colour fastness for six weeks gave a true reflection of good fastness properties of 5 and 4. This is due to effective penetration and efficient dye fixation with cotton fabrics. The overall result suggests that the introduction of bromo group to benzene ring of dye molecule impacted a hypsochromic shift of 60 nm in 10a, compared to 10b.
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