Wednesday, September 12, 2012 preview

PolySciTech's new site is set to launch soon. This site discusses several of our more "weird" polymers in terms of what they are and how they are used. What follows is a preview of one section describing polystyrene-b-poly(4-vinylpyridine)

Polymer: Poly(styrene)-block-Poly(4-vinyl pyridine)
Example(s): PolyVivo AO24

*-structure shows actual material generated including RAFT control agent
Description: PS-P4VP and related block copolymers naturally self-assemble under the right conditions into a variety of nanostructures.  Metal nanoparticles can be formed in-situ by these microdomains.  PS-P4VP have been used to generate Au clusters, Co, and Fe arrays, and self-assembled Au and Fe2O3 nanoparticles (Yeh et. al., 2005). 
This polymer is soluble in mixtures of DMF and water and the microdomains and assembled structures can be adjusted by fine-tuning the pH of the solution ( also it has been established that strong hydrogen bonding occurs between the 4-vinyl-pyrridine units and 3-n-pentadecylphenol which also alters its supramolecular structure (Ruokolainen, et. al. 1999).  The supramolecular domain can also be altered using 2-(4′-hydroxybenzeneazo)benzoic acid (HABA) (Tung, et. al. 2008).
Useful Full-text References:
(Ruokolainen, et. al. 1999)
(Ekenstein, 2003)
(Valkama, et. al. 2006)
(Ikkala et. al. 2004)
 (Tung, et. al. 2008).
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