US Patent 7,226,957
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A method for producing polymers with controlled molecular weight and desired end functionalities and the resulting polymers. The method comprises a) forming a microemulsion comprising monomer, water, and an effective amount of an effective surfactant, b) adding to the microemulsion an amount of a water-soluble photo-initiator system wherein the initiator system produces one type of monomer-soluble radical active centers and wherein the radical active centers contain desired end group functionalities for a polymer or oligomer, and c) illuminating the microemulsion to photoinitiate polymerization of the monomer wherein the illuminating is according to a temporal and spatial illumination scheme, and wherein the amount of the initiator system and the temporal illumination scheme are chosen to produce a desired molecular weight of the polymer or oligomer. The microemulsion can further comprise an effective amount of an effective co-surfactant. The method can be used to produce polymers and copolymers.
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Scranton, Alec and Jain, Kaveri Method for producing polymers with controlled molecular weight and end group functionality using photopolymerization in microemulsions. US Patent 7,226,957 filed November 03, 2003 and issued June 05, 2007. https://ir.uiowa.edu/patents/428