Richard Alexander Evans
University of New South Wales
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Publication
Featured researches published by Richard Alexander Evans.
Polymer Chemistry | 2010
Francesca Ercole; Thomas P. Davis; Richard Alexander Evans
There has been considerable interest in the application of photochromism to photo-responsive systems which has led to the development of new tailored smart materials for photonics and biomedical fields. Within a polymeric matrix photochromic isomerizations can be stimulated by light to reversibly alter the physical and chemical properties of a material such as LC phase, shape, surface wettability, permeability, solubility, self-assembly, size and fluorescence. The underlying principles behind photo-responsive behavior, subsequent applications and relevant examples are discussed in this review.
Australian Journal of Chemistry | 2007
Richard Alexander Evans
New methods to synthesize and functionalize polymers are of constant interest to the polymer scientist. The 1,3-dipolar cycloaddition between an azide and terminal alkyne has received much attention since the reports that copper(i) provides high yields and regioselective synthesis of 1,4-substituted 1,2,3-triazoles. This coupling chemistry has been rapidly adopted by polymer scientists in the synthesis and post-polymerization modification of polymers. This Review will provide the historical context of the recent development of the copper-mediated azide–alkyne cycloaddition and its use in polymer science, particularly in dendrimer synthesis/functionalization, surface immobilization/modification, orthogonally functionalizing polymers, and its integration with ATRP (atom transfer radical polymerization).
Australian Journal of Chemistry | 2005
Richard Alexander Evans; Georgina K. Such
Photochromism is receiving increasing attention because of its current application in high value-added ophthalmic lenses and potential applications in data storage and molecular switching. The performance of photochromic dyes, such as spirooxazines, chromenes, and diarylethenes, in polymers is important because the above applications require the dyes to be in a host polymer. The dyes can be broadly divided into P (photo) and T (thermal) types depending on the availability of a thermal decolouration route. Current research themes for the two types are presented with an emphasis on a new method of manipulating switching speeds in polymer matrices.
Australian Journal of Chemistry | 2006
Nino Malic; Richard Alexander Evans
Polymers with a single central point of carboxylic acid functionality were prepared by living radical polymerization methods, RAFT and ATRP. A convenient water-based synthesis of a Y-branched ATRP initiator from 3,5-dihydroxybenzoic acid and 2-bromopropionyl bromide, from which the Y-branched RAFT agent is then subsequently derived, is described. Polymerization occurred uniformly from both of the RAFT groups to give chains of equal length as shown by hydrolysis. ATRP polymerization based on an ester derivative of 3,5-bis(2-bromopropionyloxy)benzoic acid as initiator was well controlled, whereas the free carboxylic acid gave inconsistent performance. The ability to couple functional molecules to the middle of polymers would provide better protection or interaction of the functional molecule with the polymer than conventional end attachment. This would find applications such as in drug delivery where more efficient protection would allow the use of lower molecular weight polymers.
Molecular Crystals and Liquid Crystals | 2005
Georgina K. Such; Richard Alexander Evans; Thomas P. Davis
ABSTRACT The photochromic performance of polymer-dye conjugates was successfully tailored using the living radical polymerization technique ATRP. ATRP allowed the synthesis of photochromic dye-polymer conjugates consisting of polymer of defined chain length and polydispersity with a single photochromic dye attached at one end. Control over the photochromic switching speed was achieved solely thorough choice of the chain length of the polymer conjugate.
Synthetic Communications | 2010
Mark York; Richard Alexander Evans
The published route to a series of 6′-arylamino substituted photochromic spirooxazines has been investigated with improvements made to perform the synthesis in satisfactory yield. The route has been exemplified with several novel derivatives prepared (including hydroxyl functionalised). Additionally, a one-pot procedure for the conversion of suitably functionalized 1,2-naphthoquinones into the photochromic compounds is reported.
Nature Materials | 2005
Richard Alexander Evans; Tracey Hanley; Melissa Ann Skidmore; Thomas P. Davis; Georgina K. Such; Lachlan H. Yee; Graham E. Ball; David A. Lewis
Archive | 2005
Richard Alexander Evans; Melissa Ann Skidmore; David A. Lewis
Archive | 2009
Nino Malic; Richard Alexander Evans
Journal of Polymer Science Part A | 2011
Nino Malic; Jonathan A. Campbell; Abdelselam Ali; Craig L. Francis; Richard Alexander Evans
Collaboration
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Commonwealth Scientific and Industrial Research Organisation
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View shared research outputsCommonwealth Scientific and Industrial Research Organisation
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