NOPR Community:

Graft copolymerisation of methyl methacrylate onto silk fibre using Ce⁺³/K₂S₂O_g as redox initiator under visible light in a limited aqueous medium

1998-12-01T00:00:00Z

Title: Graft copolymerisation of methyl methacrylate onto silk fibre using Ce⁺³/K₂S₂O_g as redox initiator under visible light in a limited aqueous medium Authors: Das, Ranjit Kumar; Basu, Diya; Khan, Asis Kumar; Banerjee, Amamath Abstract: Photograft copolymerisation of methyl methacrylate (MMA) onto mulberry silk fibre has been done in limited aqueous medium using cerrous ammonium sulphate (Ce⁺³)/potassium persulphate (K₂S₂O_g) as the redox initiator and compared with the graft copolymerization done in dark under the same conditions. Grafting, total conversion, grafting efficiency and pH dependency of the system have been studied and analysed. The mechanism of polymerisation and graft copolymer formation are discussed. FTIR spectra and SEM studies show the evidence of grafting on the fibre backbone. Page(s): 285-288

Fungal degumming of ramie and its fibre characteristics

1998-12-01T00:00:00Z

Title: Fungal degumming of ramie and its fibre characteristics Authors: Roy, S; Sannah, R; Sarkar, C R Abstract: Decorticated ramie fibres were degummed for different durations using the culture of Aspergillus flavus and then bleached with different concentrations of bleaching powder solution. It has been observed that the microbial treatments for 5 and 7 days remove 58.78% and 73.12% gum respectively without deterioration in fibre qualities. For the same concentration of bleaching powder solution and treatment time, the microbial treatment for 5 days is the best when the physical properties like tensile strength are considered. The fungal treatment for 7 days is suggested for better brightness and fibre fineness. Page(s): 281-284

Optical imaging technique for defect detection in fabric

1998-12-01T00:00:00Z

Title: Optical imaging technique for defect detection in fabric Authors: Mallik (Goswami), Bithika; Datta, Asit K Abstract: An optical imaging technique where spatial filtering of diffraction pattern indicates the presence of defects in a woven fabric is described. Experimental set-up and the test results for detection of some aperiodic defects are also described. Page(s): 277-280

Effect of pretreatment with solvents and solvent mixtures on the structure/properties and dye uniformity of textured polyester yarn

1998-12-01T00:00:00Z

Title: Effect of pretreatment with solvents and solvent mixtures on the structure/properties and dye uniformity of textured polyester yarn Authors: Chattopadhyay, D P; Singh, R K; Patra, T N; Samanta, A K Abstract: Textured polyester multifilament yarn was subjected to swelling in single and mixed solvents (with varying ratio) at room temperature for different durations. The changes in the structure and properties of the yarn were investigated by measuring birefringence, crystallinity, critical dissolution time, shrinkage on treatment, % change in bulk, residual shrinkage, crimp rigidity, dye uptake and dye uniformity. Among the four single solvents used, dimethyl formamide (DMF) and methylene chloride showed better balance of the above properties and dye uniformity. Use of a mixture of tetrachloroethane and DMF in the ratio of 1:3 gave dye uptake at par or slightly better than that given by the corresponding single solvent but showed more dye uniformity. Page(s): 267-276

NOPR Community:

Graft copolymerisation of methyl methacrylate onto silk fibre using Ce+3/K2S2Og as redox initiator under visible light in a limited aqueous medium

Fungal degumming of ramie and its fibre characteristics

Optical imaging technique for defect detection in fabric

Effect of pretreatment with solvents and solvent mixtures on the structure/properties and dye uniformity of textured polyester yarn

Graft copolymerisation of methyl methacrylate onto silk fibre using Ce⁺³/K₂S₂O_g as redox initiator under visible light in a limited aqueous medium