4.8 Article

Solvent-Induced Self-Assembly Strategy to Synthesize Well-Defined Hierarchically Porous Polymers

Journal

ADVANCED MATERIALS
Volume 31, Issue 11, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806254

Keywords

hierarchical porous polymer; hypercrosslinked polymer; porous material; solvent-free catalysis; solvent-induced self-assembly

Funding

  1. Young Thousand Talented Program [21671073, 21621001, 21671074]
  2. National Natural Science Foundation of China [21671073, 21621001, 21671074]
  3. 111 Project of the Ministry of Education of China [B17020]
  4. Program for JLU Science and Technology Innovative Research Team
  5. U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division

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Porous polymers with well-orchestrated nanomorphologies are useful in many fields, but high surface area, hierarchical structure, and ordered pores are difficult to be satisfied in one polymer simultaneously. Herein, a solvent-induced self-assembly strategy to synthesize hierarchical porous polymers with tunable morphology, mesoporous structure, and microporous pore wall is reported. The poly(ethylene oxide)-b-polystyrene (PEO-b-PS) diblock copolymer micelles are cross-linked via Friedel-Crafts reaction, which is a new way to anchor micelles into porous polymers with well-defined structure. Varying the polarity of the solvent has a dramatic effect upon the oleophobic/oleophylic interaction, and the self-assembly structure of PEO-b-PS can be tailored from aggregated nanoparticles to hollow spheres even mesoporous bulk. A morphological phase diagram is accomplished to systematically evaluate the influence of the composition of PEO-b-PS and the mixed solvent component on the pore structure and morphology of products. The hypercrosslinked hollow polymer spheres provide a confined microenvironment for the in situ reduction of K2PdCl4 to ultrasmall Pd nanoparticles, which exhibit excellent catalytic performance in solvent-free catalytic oxidation of hydrocarbons and alcohols.

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