Different types of butyl acrylate (BA)-co-acrylic
acid (AA) oligomers were synthesized via reversible addition-fragmentation
chain transfer (RAFT) polymerization and mixed with extruded 200 nm
dimethyldioctadecylammonium bromide vesicles. The resulting precursor
structures form the basis for subsequent vesicle-templated polymerizations.
Systematic variations in temperature, pH, oligomer length, and oligomer
composition and their effects on precursor morphology were studied.
Surprisingly, different morphologies were obtained, including capsules,
protruded capsules, solid spheres, and multicompartment structures.
For example, capsules and multicompartment structures were found to
result from higher AA contents, and protruded capsules and solid particles
resulted from lower AA contents. Subsequent chain extension of the
RAFT oligomers resulted in polymer nanostructures resembling the precursor
morphologies.
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