Polyion micelles with diphase-segregated core: electrostatic self-assembly of poly(ethylene glycol)-block-poly(4-vinylpyridium) and tetrakis (4-sulfonatophenyl) porphyrin in solution
(193-198) Colloid and Polymer Science 289 #2 (2011)|
Junbo et al of the University of Science and Technology, China prepared polyion micelles with poly(ethylene glycol)-block-poly(4-vinylpyridium) (PEG114-b-P(4-VPH+)35) and tetrakis (4-sulfonatophenyl) porphyrin (TPPS) in acid aqueous solution. H- and J-type aggregates of TPPS were formed in the micellar core forming a diphase-segregated core, the polymer phase and the incompatible TPPS aggregates phase.  (RDC 2/14/2011)

Self-assembly of pH-responsive and fluorescent comb-like amphiphilic copolymers in aqueous media 
(3377-3386) Polymer 51 #15 (2010)
Li et al of the National University of Singapore found that  because of acid–base interaction of the hydrophilic side chains, the copolymers can self-assemble into pH-responsive fluorescent and multi-walled hollow vesicles of well-defined morphology in aqueous media.  The size and layered wall thickness of the vesicles are also dependent on the length of the copolymer side chains, while the number of wall layers is dependent on the concentration of the vesicles in the aqueous media. In comparison, a N-isopropylacrylamide (NIPAAm)-containing comb-like amphiphilic copolymer (P(NVK-co-VBC)-comb-P(NIPAAm-co-DMAEMA)) of similar structure, albeit with non-interacting hydropholic side chains, self-assembles only into temperature and pH-responsive single-shelled hollow nanoparticles in aqueous media.  (RDC 12/22/2010)