Interfacial Instability-Driven Morphological Transition of Prolate Block Copolymer Particles: Striped Football, Larva to Sphere

Title
Interfacial Instability-Driven Morphological Transition of Prolate Block Copolymer Particles: Striped Football, Larva to Sphere
Authors
장세규이성한신재만구강희이영준윤홍석김범준
Keywords
block copolymer; nanoparticle; phase transition; interface
Issue Date
2020-08
Publisher
Macromolecules
Citation
VOL 53, NO 16-7206
Abstract
Shape- and structure-controlled block copolymer particles have received great attention due to their unusual physical properties, hence achieving structural diversity of the particles is highly desirable. Herein, we report a confined assembly of poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) and dibromoalkyl molecular additives in emulsion droplets, which allows for significant changes in particle shape and structure from striped football to larva and sphere. The morphological transitions are dependent on the volume fraction of dibromoalkyl additives, exhibiting three distinct phases including (1) elongation of striped football particles (prolate ellipsoids) as a consequence of increased domain spacing, (2) transformation of the striped internal morphology into sandwiched lamellae to result in larva-like particle, and (3) disassembly of larva into spheres. The key driving force to achieve such structural transition is the quaternization of P2VP chains by dibromoalkyl additives. Consequently, significant changes in swelling/deswelling of P2VP domains of PS-b-P2VP particles are induced in concert with a favorable interaction with the surrounding aqueous phase depending on the volume fraction of the additives. Detailed observation of the morphological evolution is performed by freeze-drying the emulsions as a function of evaporation time to gain a deeper understanding of these structural transitions.
URI
http://pubs.kist.re.kr/handle/201004/72036
ISSN
0024-9297
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KIST Publication > Article
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