Graft Polymerization Of Acrylonitrile Research Articles

Copolymers of starch and polyacrylonitrile: The dilution effect

AbstractIn the ceric ammonium nitrate‐initiated graft polymerization of acrylonitrile (AN) with starch, grafting frequencies and molecular weights of grafted polyacrylonitrile changed from 600 anhydroglucose units (AGU)/graft and 120000 to 280 AGU/graft and 36000 when concentrations of starch and AN were varied from 0.27 and 1.20 to 0.023 and 0.235 moles/l. of water, respectively. The influence of variety of starch, size of the starch granules, and reaction time was studied, and possible reasons for the influence of reactant concentration on the composition of the copolymer are considered.

Anionic Graft Polymerization of Acrylonitrile on Cellulose

The anionic graft polymerization of acrylonitrile on cellulose was studied with sodium cellulosate as initiator and rayon yarns as substrate. Products containing up to 22% grafted polyacrylonitrile were obtained. The graft polymerization reaction was always accompanied by homopotymer formation. Graft polymers with low molecular-weight side chains (up to 15,000) and relatively high degrees of substitution were achieved. The reaction was studied as a function of the ratio of monomer/initiator concentration, and it was observed that graft polymerization yield decreased, molecular weight in creased, and the polyacrylonitrile content in the products increased with increase in this ratio. The mechanical properties of the rayon yarns under standard conditions were not adversely affected by the grafting, but strength and extensibility were decreased under wet conditions.

The effect of the permeability of capron fibre on the kinetics of vapour-phase graft polymerization of acrylonitrile and acrylic acid

The effect of the permeability of capron fibre on the kinetics of vapour-phase graft polymerization of acrylonitrile and acrylic acid

Effect of methanol on the vapour-phase graft-polymerization of acrylonitrile on capron fibre

Effect of methanol on the vapour-phase graft-polymerization of acrylonitrile on capron fibre

Anionic graft polymerization of acrylonitrile and methacrylonitrile on cellulose acetate

The anionic graft polymerization of AN and MAN on cellulose acetate alkoxide derivative (Li, Na, K) was investigated in THF, DMF, and DMSO. Although the yield of the polymerization was high the extent of grafting of acrylonitrile was low (1.4–5.3% in DMF and DMSO and 20% in THF) due to homopolymerization caused by chain transfer to monomer. With methacrylonitrile which has no acidic α-hydrogen the amount of grafted monomer was higher (37–72%).

Initiation of graft polymerization on cellulose by hydroxyl radicals and by ceric salts

Landells and Whewell have previously reported that vinyl monomers are polymerized “within viscose filaments” by hydrogen peroxide in the presence of ferrous salts and the polymers are not extractable. Such products, obtained by polymerization of acrylonitrile and styrene in viscose, have now been acetylated. Fractionation of the acetylated products has yielded graft copolymers of polyacrylonitrile and polystyrene, respectively, on cellulose triacetate. It is concluded that hydroxyl radicals initiate graft polymerization of acrylonitrile and styrene on cellulose. A similar approach, utilizing acetylation and fractionation, has been used to demonstrate that Mino and Kaizerman's method of initiation of graft polymerization with ceric salts is applicable to cellulose and results in true graft polymerization.