NOPR Collection:

Synthesis and characterization of bis-azodiols and their utilization in the coloured polyesters

Mon, 01 Sep 1997 00:00:00 GMT

Title: Synthesis and characterization of bis-azodiols and their utilization in the coloured polyesters Authors: Patel, M P; Modi, B J; Patel, R G; Patel, V S Abstract: A series of coloured polyesters has been synthesized by interfacial polycondensation reaction of terephthaloyl chloride and various bis-azodiols derived from diarylidene cyclopentanone and diarylidene cyclohexanone by coupling with various diazotized fast bases. All the coloured polyesters were characterized by elemental analysis, IR spectroscopy, UV-visible spectroscopy, viscometry, solubility, bleeding test and thermogravimetric analysis. The bis-azodiols were applied on nylon and polyester fibres and their dyeing performance assessed. These dyes showed fair to good fastness to light and very good to excellent fastness to washing, rubbing, perspiration and sublimation. Page(s): 202-209

Chemical modification of jute: Part I-Effect of alkali treatment, cyanoethylation, acetylation and henzoylation on FTIR spectra and physico-chemical behaviour of jute

Mon, 01 Sep 1997 00:00:00 GMT

Title: Chemical modification of jute: Part I-Effect of alkali treatment, cyanoethylation, acetylation and henzoylation on FTIR spectra and physico-chemical behaviour of jute Authors: Samal, R K; Mohanty, M; Panda, B. B.; Rout, S K Abstract: Jute fibres have been chemically modified by alkali treatment, cyanoethylation, acetylation, acetylation- cyanoethylation, benzoylation and benzoylation-cyanoethylation and the parent and chemically modified jute fibres have been characterized by FTIR spectra. Moisture regain, tensile modulus and behaviour towards some chemical reagents of parent and chemically modified fibres have also been evaluated. The modified fibres show significant hydrophobicity, improved tensile modulus and good chemical resistance. Page(s): 195-201

Ceric-induced grafting of 2-hydroxyethyl methacrylate onto jute

Mon, 01 Sep 1997 00:00:00 GMT

Title: Ceric-induced grafting of 2-hydroxyethyl methacrylate onto jute Authors: Kumar, S Ajith; Cherian, Ajith; Rama, H S; Kansara, S S Abstract: Graft copolymerization of 2-hydroxyethyl methacrylate (HEMA) has been carried out on jute using cerie ammonium nitrate (CAN) as an initiator. The effects of initiator concentration, temperature, duration of reaction, monomer concentration and acid concentration have been studied to obtain the optimum conditions for grafting. The maximum grafting (80%) has been achieved at initiator conc., 0.04 mol/L; monomer conc., 0.45 mol/L; acid conc., 0.2 mol/L; temperature 40°C; and reaction time 2 h). The activation energy of graft copolymerization of HEMA onto jute has been found to be 30 kJ/mol. A suitable mechanism for grafting has also been proposed. Page(s): 190-194

Water-free dyeing of textile accessories using supercritical carbon dioxide

Mon, 01 Sep 1997 00:00:00 GMT

Title: Water-free dyeing of textile accessories using supercritical carbon dioxide Authors: Knittel, Dierk; Saus, Wolfgang; Schollmeyer, Eckhard Abstract: Results are given about a new dyeing process for dyeing synthetic fibre material with disperse dyes. The use of supercritical carbon dioxide as dyeing medium completely avoids water pollution and the need of drying. Laboratory results show excellent levelness and fastnesses on the dyeing of poly(ethylene terephthalate) and polyamides. Especially, the good results are achievable for small lots like textile accessories. The state of technical development is briefly described. Page(s): 184-189