Some aspects of the role of amines in the photoinitiated polymerisation of acrylates in the presence and absence of oxygen

Bradley, Grant and Davidson, R. Stephen (1995) Some aspects of the role of amines in the photoinitiated polymerisation of acrylates in the presence and absence of oxygen. Recueil Des Travaux Chimiques Des Pays-Bas-Journal of the Royal Netherlands Chemical Society, 114 (11-12). pp. 528-533. ISSN 0165-0513. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Triethanolamine (1), N-methyldiethanolamine (2) and N,N-dimethylethanolamine (3) have been used in conjunction with the 2-(2-chlorophenyl)-4,5-diphenylimidazolyl radical and triplet benzophenone to initiate the polymerisation of lauryl acrylate. The radical abstracts a hydrogen atom from the amine to generate an alpha-aminoalkyl radical. From the order of reactivity of the amines towards the lophyl (triarylimidazolyl) radical i.p. 2 >> 1 > 3 it is concluded that hydrogen-atom abstraction occurs rather than electron followed by proton transfer. The imidazolyl radicals abstract hydrogen from thiols in a similar fashion more effectively to give thiyl radicals which initiate polymerisation of the acrylate. By following the progress of the polymerisation reactions by RTIR spectroscopy, it was concluded that the effectiveness of the amines to reduce oxygen inhibition is 1 < 3 < 2. The ability of the amines to act as synergists in the polymerisation of thin films of lauryl acrylate initiated by lophyl radicals and tripler benzophenone was assessed. The efficiency of the amines was found to be 2 similar to 1 > 3 for reaction with lophyl radicals whereas with triplet benzophenone the three amines gave similar amounts of polymer. For amines 2 and 3. two types of amino alkyl radical can be generated. It is concluded that radicals of type > NCHCH2OH are more effective initiators than CH2N <.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: P. Ogbuji
Date Deposited: 08 Jun 2009 08:23
Last Modified: 16 May 2014 09:23
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