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Surfactant-free emulsion Pickering polymerization stabilized by aldehyde-functionalized cellulose nanocrystals
Mariem Errezma1, Ayman Ben Mabrouk1, Albert Magnin2
1University of Sfax, Faculty of Science, LSME, BP1171-3018 Sfax, Tunisia.
Carbohydrate Polymers
|October 6, 2018
Summary
Aldehyde-functionalized cellulose nanocrystals (CNCs) effectively stabilize Pickering emulsion polymerization without surfactants. Higher aldehyde content in CNCs improves colloidal stability and transparency in resulting nanocomposite films.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Pickering emulsion polymerization offers a surfactant-free route for synthesizing polymer nanoparticles.
- Cellulose nanocrystals (CNCs) are sustainable nanomaterials with potential as Pickering stabilizers.
- Functionalization of CNCs can enhance their performance in polymerization processes.
Purpose of the Study:
- To synthesize aldehyde-functionalized CNCs.
- To investigate their efficacy as stabilizers in Pickering emulsion polymerization of acrylates.
- To evaluate the properties of the resulting nanocomposite films.
Main Methods:
- Periodate oxidation and sonication for CNC functionalization.
- Pickering emulsion polymerization using a redox initiation system.
- Particle size, zeta-potential, colloidal stability, transmittance, and DMA analysis.
Main Results:
- Aldehyde-functionalized CNCs acted as effective stabilizers without surfactants.
- Higher aldehyde content in CNCs led to better colloidal stability and smaller particle sizes.
- Nanocomposite films showed improved transparency with higher aldehyde content CNCs, but reduced mechanical properties.
Conclusions:
- Aldehyde-functionalized CNCs are efficient Pickering stabilizers for acrylate polymerization.
- The aldehyde groups play a crucial role in stabilization and particle nucleation.
- The study demonstrates a pathway for creating transparent, stable polymer nanocomposites using functionalized CNCs.
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