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Initiating Cationic Radiation Polymerization of N-Vinyl Pyrrolidone

IP.com Disclosure Number: IPCOM000049743D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Franey, TE: AUTHOR

Abstract

Halogenated organic compounds, such as chloroform and tribromo ethanol, initiate the polymerization of N-vinyl pyrrolidone under electron beam activation.

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Initiating Cationic Radiation Polymerization of N-Vinyl Pyrrolidone

Halogenated organic compounds, such as chloroform and tribromo ethanol, initiate the polymerization of N-vinyl pyrrolidone under electron beam activation.

Electron beam radiation polymerizes unsaturated monomers through a free radical mechanism. Some monomers react very slowly by this mechanism, and some do not react at all. This article describes a method by which these monomers can be cured by electron beam radiation utilizing another mechanism, namely cationic polymerization. A monomer such as N-vinyl pyrrolidone has a partial negative charge at the vinyl group which repels other partially negatively charged vinyl groups causing a very slow reaction rate when polymerized by a free radical mode as introduced by the electron beam. By introducing a species which, under electron bombardment, produces cations, these cations can then initiate the polymerization of N-vinyl pyrrolidone which proceeds rapidly. The species introduced must be stable so as not to initiate polymerization until bombarded by the electron beam.

The class of materials found to be effective is halogenated organic compounds. The following table lists the improvement in the percent reacted of N-vinyl pyrrolidone monomer when bombarded by 2 megarads of radiation. The concentration of the cationic enhancer used was 1 percent.

Cationic Enhancer Percent Unreacted N-Viny Pyrrolidone None 91 percent

Chloroform 0.9 percent

Benzyl Chlori...