I don't remember details, but check publications about Photodynamic Therapy of Cancer Threatment. There polymers are being often used as carriers for photosensitizers. Check some reviews, like this one:

http://www.sciencedirect.com/science/article/pii/S1011134401002676

and detailed research papers like:

http://www.sciencedirect.com/science/article/pii/S0169409X03002096

to form micelles, polyethylene glycol steareat will be a good choice but you should use the polymer having a large head group like polyoxyethylene glycol (40) steareat. you can also use lipo-polymers such as DSPE-PEG2000

A good candidate might be poly(vinyl alcohol). Check our papers on our website:

www.stc.uniroma2.it/cfmacro/cfmacroindex.htm

Kind regards and good luck !

Gaio Paradossi, University of Rome Tor Vergata.

Try polycaprolactone ...but its not soluble in biological fluid. You can also try poloxamer.....