Initiation of emulsion polymerisation by gamma‐irradiation. Polymer grafting in a system of unlimited kinetic chain length

Einige Vinylmonomere Iassen sich in waJriger Emiilsion durch ionisierende Strahlung niit hoher Strahlungsausbeute polymerisieren. Die Kinetik dieser Reaktion und die Kinetik der mit wasserloslichen Initiatoren ausgelosten Etnulsionspolynierisation ist bei gleicher Rezeptur sehr ahnlich. Die Reaktionsgeschwindigkeit ist bei der Emulsionspolymerisation etwa hundertmal groJer als bei der Polymerisation in Substanz. Die Initiierung der Emirlsionspolynierisation mit ionisierender Strahlung erlaubt eine gleichnifiJige ,,Ausleuchtung" des Reaktionsraumes und die naheiu beliebige Variation der Initiierungshaufigkeit wfihrend der Reaktion. Der starke AbfalI der Bruttoreaktionsgeschwindigkeit beim Aiifhoren der Initiierung bei der durch y-StrahIen induzierten Emulsionspo Iymerisation von Styrol widerspricht der bisherigen Auffassung von streng getrennten Reaktionsrciumen.

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Emulsion Polymerization of Vinyl Monomers under the Influence of Ionizing Radiation

Hummel

1963

Angew. Chem. Int. Ed. Engl.

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on the scattering cross-section for the conduction electrons and on the effective charge. The forces act in the same direction, if the interaction with the conduction electrons, not the field force, constitutes the greater part of the driving force. The forces are dependent upon the position coordinate only when either the concentration or the temperature varies along the sample. With equal mobility of both components, both dimensional and concentration changes are possible. Rxeived, November 16th, 1962 [A 281/94 IE1 [60] H . Biickle: Lecture on powdcr metallurgy at the first Plansee-Seminar, Reutte/Tirol (Austria) 1953. [61] Th. Hehenkamp and Th. Hcwrntrnn, Arch. Eisenhuttenwes. 33, 510 (1962).Ionizing radiation induces the polymerizaiion of some vinyl monomers in aqueous emulsion with high radiation yields. With identical emulsion compositions, the kinetics ofthis reaction and the kinetics of emulsion polymerization induced by water-soluble initiators are very similar. The rate of reaction in emulsion polymerization is aboui one hundred times greater than in bulk polymerization. The initiation of emulsion polymerization by means of ionizing radiation permits uniform "illumination" of the reacting volume, as wall as almost any desired variation in the frequency of initiation during the reuction. The sharp decrease in the overall rate of reaction when initiation is interrupted duritiK emulsion polymerization of styrene induced by y-rays contradicts the earlier concept of sharply separaied reaction zones. Receivcd, May 30th, 1962 I A 276192 IE]

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Initiation of emulsion polymerisation by gamma‐irradiation. Polymer grafting in a system of unlimited kinetic chain length

Cited by 15 publications

References 11 publications

Fractionation of Polymers

Fractionation of Polymers

Die Emulsionspolymerisation von Vinylmonomeren unter dem Einfluß ionisierender Strahlung

Emulsion Polymerization of Vinyl Monomers under the Influence of Ionizing Radiation

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