GRAFT COPOLYMERIZATION OF STYRENE ONTO CELLULOSE BY USING POTASSIUM PERSULFATE AS INITIATOR

Graft copolymers of acrylic monomers with cotton cellulose were obtained. The dependence of the degree and efficiency of grafting of acrylic acid and methyl methacrylate to cellulose on the concentration of monomer and initiator was investigated. Pre-adsorption of the initiator in the macromolecules of cellulose leads to an increase in the efficiency of the grafting. The efficiency of grafting is higher in those systems in which the initiator used is insoluble in the monomer solvent. Absorption of cellulose with an aqueous solution of the initiator - potassium persulfate, followed by removal of water was done. The advantage of using a water-soluble initiator is that during subsequent processing with a solution of monomer in an organic solvent, the desorption of the active centers does not occur. An increase in the concentration of theinitiator leads to an increase in the degree of grafting, a slight increase in the efficiency of the grafting, a significant decrease in the degree of polymerization and the molecular weight of the graft chains. In a heterogeneous process, an increase in the efficiency of grafting with an increase in the concentration of theinitiator is promoted by the additional adsorption interaction of the initiator molecules with the surface of cellulose. With an increase in the concentration of monomers, the overall degree of conversion slightly increases, the efficiency of grafting slightly decreases, the degree of grafting and the molecular weight of the graft chains increase significantly. The mechanism of graft copolymerization was investigated by comparative analysis of the IR and PMR spectra of cellulose, potassium persulfate, acrylic monomers and products of their interaction. Due to the results of spectroscopic studies, a scheme of graft copolymerization reactions has been proposed. The active centers of graft copolymerization are formed as a result of the reductive interaction of potassium persulfate, water and cellulose macromolecules.

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Apparel Performance of Flame Retardant Silk Fabrics

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501300800411 ◽

2013 ◽

Vol 8 (4) ◽

pp. 155892501300800

Author(s):

Jinping Guan ◽

Hong Lu ◽

Yan Chen

Keyword(s):

Flame Retardant ◽

Graft Copolymerization ◽

Potassium Persulfate ◽

Flammability Test ◽

Silk Fabrics ◽

Garment Manufacturing

Many countries enacted flame retardant legislation for apparel such as evening dress, and pajamas. But durable and formaldehyde free flame retardant finishing for silk is necessary and challenging. In this paper, three kinds of silk fabrics with different weaving styles for apparel uses were treated with a vinyl phosphorus monomer dimethyl-2-(methacryloyloxyethyl) phosphate (DMMEP) by a graft copolymerization technique using potassium persulfate as an initiator. The treated silk fabrics can be self-extinguished after being ignited with a candle like fire, can pass the vertical flammability test, and. show some decrease in permeability. Fabric bending, shear, compression, and drape were tested so that possible problems in garment manufacturing could be predicted, because these properties not only affect the appearance of silk products but also influence the garment making process. The sewing properties of the treated silk fabrics are also discussed.

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