Synthesis and properties of fiber-grade gelatin-g-polyacrylonitrile grafted copolymers
Polimery 2000, No 4, 251
SummaryGelatins boiled out from chrome-tanned waste leathers (Table 1) were grafted with polyacrylonitrile (PAN) in an aqueous 60% ZnCl2 in the presence of K2S2O8 as initiator. The content of fiber-forming polymers in the post-reaction solutions, the degree of conversion of the monomer, the degree of grafting of PAN onto the gelatin, the content of homopolymer AN uncombined with the gelatin, and the dynamic viscosity of the resulting solutions were studied in relation to AN/gelatin initial ratio that was varied from 1 : 1 to 2.5 : 1 and to gelatin concentration (2.6–2,8%; 3,00–3,15%) (Tables 2, 3; Figs. 1–4). The grafting conditions most advantageous in terms of the copolymer-into-fiber processing properties, are: AN/gelatin weight ratio, 1.75 or 1.78; the corresponding gelatin concentration, 2.6 or 2.8%; K2S2O8 concentration, 4% (dry gelatin basis); reaction temperature, 65°C; reaction time, 150 min; pH, 2.5. Repeatability of the grafting process was studied (Table 4).