Graft copolymerization of methyl methacrylate onto jute fibers. Studies on vanadium (V)‐cyclohexanol redox system

Abstract

Graft copolymerization of methyl methacrylate (MMA) onto natural jute (chemically modified) was studied using v+ -cyclohexanol redox initiator system. The effects of time, concentration of metal ion (V+), monomer (MMA), substrate, amount of jute fibers, temperature, and acid concentration on graft yield have been studied. The effects of some organic solvents and inorganic salts on graft yield have also been studied. A grafting mechanism is proposed and an expression has been derived for the reaction rate. Grafting has improved the thermal stability and the light fastness of jute fibers dyed with basic dyes. IR spectra of the natural jute (chemically modified) and grafted jute have been taken. More than 170% graft yield could be achieved with the present system. ZUSAMMENFASSUNG:Es wurde die Pfropfcopolymerisation von Methylmethacrylat auf Naturjute (chemisch modifiziert) unter Verwendung von + -Cyclohexanol als Redoxinitiatorsystem untersucht. Die Einfliisse von Zeit, Metallionenkonzentration (v + ), Monomerem (MMA), Substrat, Anteil an Jutefasern, Temperatur und Stiurekonzentration auf die Pfropfausbeute sind bestimmt worden. Es wurde auch der EinfluB einiger organischer Ldsungsmittel und anorganischer Salze auf die Pfropfausbeute untersucht. Es wird ein Mechanismus fiir die Pfropfreaktion angegeben und das Geschwindigkeitsgesetz abgeleitet. Das Pfropfen hat die thermische Stabilitat und die Lichtechtheit der Jutefasern, die mit basischen Farbstoffen gefiirbt sind, verbessert. IR-Spektren von Naturjute (chemisch modifiziert) und gepfropfter Jute wurden aufgenommen. Eine Pfropfausbeute von mehr als 170% konnte mit diesem System erreicht werden.

Influence of glycine on the kinetics of the graft copolymerization of acrylonitrile onto jute fibers initiated by ceric ion

“…Similar observations have also been reported earlier in the study of graft copolymerization of vinyl monomers onto jute fibers. [14][15][16][17] yield has been found to increase with the concentration of Ce4+ up to 0.035 mol L-' , there has been a fall in the graft yield at the concentration of 0.05 mol L-' at all temperatures. Figure 3 shows the effect of Ce4+ concentration on the percentage of graft yield.…”

Graft copolymerization of acrylonitrile onto jute fibers (studies on Ce(IV)‐hippuric acid redox system)

“…Similar observations have been reported while studying the effect of various organic substrates on jute grafting. [17][18][19] 70 I ----…”

Graft Copolymerization of Acrylonitrile on Chemically Modified Sisal Fibers

“…But very little work has been done on the grafting on sisal fiberanother important lignocellulosic fiber. It has been reported earlier that a combination of Cu 2+ and IO 4 -can induce graft copolymerization on jute, [13] PALF [14] and coir. [15] Our present investigation deals with the study of Full Paper: Graft copolymerization of acrylonitrile (AN) on chemically modified sisal fibers was studied using a combination of NaIO 4 and CuSO 4 as initiator in an aqueous medium in the temperature range of 50-70 8C.…”