Splash scar on seed coat of black soybean caused by &lt;I&gt;Cercospra&lt;/I&gt; fungus

Kimura, Shigemitsu

doi:10.4165/kapps1958.45.0_73

Cited by 1 publication

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“…Crafting does not occur when dry cellulose or PVAL is irradiated in styrene or methyl methacrylate [ 5 ] ; the presence of a small amount of water or methanol in the polymer or monomer phase promotes grafting. The radiation induced grafting onto cellulose [6] or PVAL [7] by preirradiation technique is initiated not by peroxides but by trapped radicals independent of the presence or absence of air during preirradiation.…”

Section: Grafting Of Methyl Methacrylate and Styrene Onto Polyvinyl Amentioning

confidence: 99%

Chemical structure of cellulose‐styrene graft copolymers

Sakurada

Ikada

Nishizaki

1972

J. polym. sci., C Polym. symp.

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At first polyvinyl alcohol was used as a model for cellulose, and the grafting of styrene and methyl methacrylate was carried out in a heterogeneous system by use of mutual irradiation, preirradiation, and catalytic method. In all cases trichloroethylene or carbon tetrachloride was added to the reaction mixture to shorten the branches. True graft copolymers were isolated by vigorous alternate extraction of unreacted PVAL and homePST (or -PMMA), and hydroxyl goups in the copolymers were completely acetylated to carry out osmotic measurements. Molecular weights of the separated chains and the mother polymers were also determined by osmometry. It was shown that the graft copolymer has only one mother PVAL molecule and one graft branch regardless of the grafting methods employed. In the case of cellulose, high tenacity rayon was used as a substrate. The reaction product was acetylated, and the extraction of homo-PST and unreacted cellulose (in the form of triacetate) was carried out with benzene (at 80°C) and CH,Cl, -MeOH (l:l, at room temp.), respectively. In this case also, it was shown that the graft copolymer molecule consisted of one graft branch and one mother cellulose molecule.Graft polymerization onto cellulose has been the subject of numerous investigations, and some reviews in this field are available in the literature [ 1-21 .

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Section: Grafting Of Methyl Methacrylate and Styrene Onto Polyvinyl Amentioning

confidence: 99%