Journal
POLYMER
Volume 213, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123326
Keywords
3D confined assembly; Block copolymers; Polymer particles
Categories
Funding
- National Key Research and Development Program of China [2018YFC1105401]
- National Natural Science Foundation of China [21622403]
- program for JLU Science and Technology Innovative Research Team [2017TD-10]
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [2020-09]
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Utilizing a polymer surfactant to control 3D confined assembly in emulsion droplets can lead to block copolymer particles with tunable nanostructures, resulting in the formation of unusual shapes of particles. By systematically studying the morphological formation mechanism, a new surfactant platform has been provided to tune the confined assembly of block copolymers.
3D confined assembly in emulsion droplets is an effective way to prepare block copolymer particles with tunable nanostructures. In this process, the multi-component interaction at the droplet interface plays a crucial role, which is mainly dominated by surfactants. Here, we report the utilization of a polymer surfactant, ammonium-terminated polystyrene chains (N-PSn), to control the 3D confined assembly of poly(styrene-block-2-vinylpyridine) (PS-b-P2VP). N-PSn shows a different interfacial tuning ability from small molecular surfactants, which can not only stabilize the emulsion droplets but also increase the volume fraction of PS components through fusing its PS chains with PS-b-P2VP. Consequently, unusual nanostructured PS-b-P2VP particles were obtained based on a binary surfactant system of N-PSn and poly(vinyl alcohol), e.g., the rarely reported toroid-stacked ellipsoidal particles. The morphological formation mechanism was systemically studied by regulating the molecular weight of N-PSn.These results provide a new surfactant platform to tune the confined assembly of block copolymers.
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