Bicontinuous Nanospheres from Simple Amorphous Amphiphilic
Diblock Copolymers
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Abstract
Bicontinuous
nanospheres have been observed (although rarely) from
a variety of block copolymers with architectural and compositional
complexity, and often in the presence of additives. Unlocking key
features involved in their formation presents possibilities for bicontinuous
aggregates with varied functionality and application. An attractive
prospect is the ability to form them from much simpler polymeric structures
derived from facile syntheses. To that end, we herein report the formation
of bicontinuous aggregates from simple amorphous amphiphilic diblock
copolymers of poly(ethylene oxide)-<i>b</i>-poly(<i>n</i>-butyl methacrylate), analogous to our previous report
of the same from a semicrystalline comb-like block copolymer. Moreover,
we demonstrate that polymorphism can be achieved by altering the relative
block proportions and the nonselective cosolvent. We find that the
polymeric structure is not the dominating factor in the formation
of bicontinuous nanospheres but that the choice of cosolvent for the
hydrophilic block appears to have greater influence on determining
the end morphology