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Preparation of Anisotropic Trimeric Poly(Ionic Liquid) Microspheres via Microwave-Assisted Dual-Crosslinked Seed
Xufeng Hu1, Jingyi Li2, Liqin Xiang1
1Smart Materials Laboratory, Department of Applied Physics, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China.
Macromolecular Rapid Communications
|February 7, 2025
Summary
A novel microwave-assisted method creates unique trimeric poly(ionic liquid) microspheres. This technique utilizes dual-crosslinked seed emulsion polymerization for anisotropic structures, offering tunable morphology.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Poly(ionic liquid) (PIL) microspheres are of interest for various applications.
- Existing methods for creating complex microsphere morphologies, such as trimeric structures, often require specialized seed microspheres with gradient properties.
- Developing simpler, efficient methods for anisotropic PIL microsphere synthesis is crucial.
Purpose of the Study:
- To report a new microwave-assisted dual-crosslinked seed emulsion polymerization method.
- To prepare anisotropic trimeric poly(ionic liquid) (PIL) microspheres.
- To investigate the influence of microwave irradiation on morphology retention.
Main Methods:
- Preparation of ethylene glycol dimethacrylate (EGDMA)-crosslinked PIL (CPIL) seed microspheres.
- Formation of dual-crosslinked PIL (D-CPIL) microspheres via swelling CPIL with a divinylbenzene (DVB)-containing ionic liquid (IL) emulsion, followed by microwave polymerization.
- Swelling D-CPIL microspheres with IL monomer emulsion to induce trimeric morphology, followed by microwave polymerization to obtain the final trimeric PIL microspheres.
- Morphological characterization using optical microscopy and scanning electron microscopy (SEM).
Main Results:
- Successfully synthesized anisotropic trimeric PIL microspheres using the developed method.
- The dual-crosslinking strategy, involving a low-crosslinked core and high-crosslinked shell in D-CPIL, drives trimeric formation through local contraction forces during swelling.
- Microwave polymerization was found to be essential for preserving the trimeric morphology, outperforming conventional heating methods.
- Morphology control is achievable by adjusting parameters like crosslinker type/amount, monomer/seed ratio, initiator dosage, and temperature.
Conclusions:
- The reported microwave-assisted dual-crosslinked seed emulsion polymerization offers an effective route to anisotropic trimeric PIL microspheres.
- This method overcomes limitations of previous techniques by not requiring gradient crosslinking or wettability in seed microspheres.
- The findings highlight the importance of microwave irradiation for maintaining complex polymer architectures and suggest pathways for tunable microsphere design.
