Warp Tension of Tricot Machines

Terasaki, M.; Maeda, Masunobu; Yamaguchi, Tatsuya

doi:10.4188/transjtmsj1948.16.682

Cited by 1 publication

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“…On account of its high grafting efficiency compared to other known redox systems such as persulfste-thiosulfate and ferrous-Hz02 ~y s t e m s ,~-~ this system has gained considerable importance in grafting reactions. [5][6][7][8][9][10][11][12][13][14][15][16][17][18] Iwakura and co-workers" have shown that primary alcohols and glycols as graft initiators are more effective than secondary and tertiary alcohols. Mino and co-workers have also shown that in the case of glycols, e.g., pinacol, the 1:2 glycol group is cleaved during the oxidation reaction with Ce(1V).…”

Section: Introductionmentioning

confidence: 99%

Graft copolymerization of vinyl monomers on modified cottons. III. Grafting of acrylonitrile and methyl methacrylate on cyanoethylated cotton by the ceric ion method

Kantouch

Hebeish

El‐Rafie

1971

J of Applied Polymer Sci

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synopsisThe interaction of acrylonitrile and methyl methacrylate with cyanoethylated cotton in the presence of ceric ion has been studied under a variety of conditions. Increasing the reaction time, the monomer concentration, and the temperature favorably influences the degree of grafting. The same holds true for initiator concentration up to a certain limit, after which a decrease in the graft yield was obtained. On the other hand, ceric consumption during grafting and oxidation increases by increasing the magnitudes of all these factors. However, the consumption during grafting is always higher than that during oxidation. The graft yields obtained with cyanoethylated cotton are greater than those of the control, being increased by increasing the degree of substitution (D.S.) of the cyanoethylated cotton, suggesting that the cyanoethyl groups afford additional sites of grafting. On the other hand, the ceric consumption during oxidation of cyanoethylated cotton was much lower than that of the control, being increased also by increasing the D.S., indicating perhaps that ceric ion attacks the cyanoethylated cotton exclusively at the cyanoethyl groups. Based on these findings, a scheme for the mechanism of reaction of a vinyl monomer with cyanoethylated cotton was proposed.

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