Accession Number : ADA277164


Title :   A Visible Light Initiating System for Free Radical Promoted Cationic Polymerization


Descriptive Note : Technical rept.


Corporate Author : BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES


Personal Author(s) : Bi, Yubai ; Neckers, D C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a277164.pdf


Report Date : 02 Feb 1994


Pagination or Media Count : 52


Abstract : A new visible light free radical promoted cation in chain polymerization is reported. The system is based on electron transfer photoreduction of xanthene dye triplets by aromatic amines possessing a hydrogen on the alpha carbon atom to the nitrogen. Subsequent deprotonation of the amine radical cation followed by onium salt oxidation leads to formation of an (alpha- amino carbenium ion and the latter initiates polymerization. Critical to the success of the system are the basicity of the amine, the oxidation potential of the onium salt, and the presence or absence of nucleophilic centers in the monomer to be polymerized. The scope and details of the system are discussed in the publication. Visible light photoinitiating system, Free radical promoted cationic polymerization.


Descriptors :   *PHOTOCHEMICAL REACTIONS , *POLYMERIZATION , *FREE RADICALS , IONS , LIGHT , HYDROGEN , VISIBLE SPECTRA , AROMATIC COMPOUNDS , ELECTRON TRANSFER , CYCLOHEXENES , GEL PERMEATION CHROMATOGRAPHY , ION ION INTERACTIONS , OXIDATION REDUCTION REACTIONS , EPOXY RESINS , QUALITATIVE ANALYSIS , DYES , MONOMERS , AMINES , NITROGEN , CATIONS , EXPERIMENTAL DATA


Subject Categories : Radiation and Nuclear Chemistry
      Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE