Multidimensional Design of Anisotropic Polymer Particles from Solvent‐Evaporative Emulsion

• Published in: Advanced functional materials Vol. 28; no. 42
• Main Authors: Ku, Kang Hee, Shin, Jae Man, Yun, Hongseok, Yi, Gi‐Ra, Jang, Se Gyu, Kim, Bumjoon J.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 17-10-2018
• Subjects: Additives; Anisotropy; Block copolymers; Confining; Droplets; Emulsion polymerization; emulsions; Evaporation; Evaporation rate; Interfacial properties; Materials science; Morphology; Organic chemistry; Particle shape; Phase separation; polymer particles; Polymers; Shape control; Solvents; surfactant design
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.201802961

Colloidal particles with controlled shape and internal structure have attracted great attention due to their novel morphologies and various potential applications. Among the diverse synthetic strategies toward anisotropically shaped polymer particles, facile and accurate engineering of such structures remains challenging. This review highlights the synthetic approaches to manipulate the shape of polymer particles driven by phase separation in emulsions upon solvent evaporation. And, special attention is given to the thermodynamic and kinetic principles of particle shape control, followed by detailed experimental examples and their applications. Major synthetic strategies for the preparation of nonspherical block copolymer (BCP) particles by evaporation of solvent from BCP‐containing emulsions are discussed as follows: engineering of i) interfacial properties of the confining emulsion droplets, ii) particle (or droplet) size, iii) segregation behavior of BCPs within the droplet, and iv) solvent‐induced BCP self‐assembly kinetics (i.e., solvent evaporation rate). Next, functionalized BCP particles produced by careful design of the chemical structures of polymer or by incorporation of functional additives into the polymer matrix are introduced. Finally, this review article aims to present the challenging issues associated with current methods and future directions for research in this field.
The recent progress on the synthetic strategies for the preparation of anisotropically shaped polymer particles by the emulsion‐solvent evaporation approach is reviewed herein. In particular, the thermodynamic (surfactant properties, particle size, and polymer segregation behavior) and kinetic (solvent manipulation) parameters affecting the shape of polymer particles are described with related theoretical explanations, examples, and potential applications.