Cellulose Nanocrystal-Reinforced Elastomers

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Contexte

Cellulose nanocrystals (CNCs) are promising bio-based nanofillers because of their high axial stiffness, anisotropic morphology, surface functionality and ability to organize into optically anisotropic structures [1,2]. Their incorporation into hydrophobic polymer matrices nevertheless remains challenging because of their strong hydrophilicity and tendency to aggregate, making surface modification and control of dispersion critical parameters for nanocomposite performance [1,3].

Previous work in the laboratory has established a proof of concept for the preparation of transparent crosslinked elastomeric films containing surface-modified cellulose nanocrystals. Different surface-compatibilization and processing strategies have been investigated to improve CNC dispersion in organic media and facilitate their incorporation into the polymer network. These results provide a basis for a more systematic investigation of the relationships between CNC surface properties, dispersion state, network structure and final material performance.

[1] Moon, R. J., Martini, A., Nairn, J., Simonsen, J., & Youngblood, J. (2011). Cellulose nanomaterials review: structure, properties and nanocomposites. Chemical Society Reviews, 40, 3941–3994.
[2] Tran, A., Boott, K. E., & MacLachlan, M. J. (2020). Understanding the Self-Assembly of Cellulose Nanocrystals—Toward Chiral Photonic Materials. Advanced Materials, 32, 1905876.
[3] Gomri, C., Cretin, M., & Semsarilar, M. (2022). Recent progress on chemical modification of cellulose nanocrystal (CNC) and its application in nanocomposite films and membranes. Carbohydrate Polymers, 294, 119790.

Objectifs

The objective of this internship will be to consolidate and extend this proof of concept by establishing quantitative structure–property relationships in CNC-reinforced elastomeric materials. The work will focus on:

  • optimizing CNC dispersion and incorporation while controlling filler loading and polymerization conditions; comparing different CNC surface-modification and compatibilization strategies under well-defined reference conditions;
  • quantifying CNC retention and dispersion within the polymer network;
  • determining the influence of CNC content and surface chemistry on mechanical and optical properties under deformation.

Approche Expérimentale

The student will prepare and modify CNCs, formulate crosslinked elastomeric networks and produce nanocomposite films with controlled compositions. Particular attention will be paid to colloidal stability, processing conditions, reproducibility and appropriate reference formulations.

Characterization will combine spectroscopic, colloidal, thermal and microscopic techniques, together with mechanical testing and optical characterization under deformation. The aim will be to correlate nanofiller content, dispersion state and interfacial properties with the mechanical and optical response of the resulting materials.

Profil du candidat

The project is suitable for an M1 or M2 student with a background in polymer science, materials science, physical chemistry, chemical engineering or a related field. A strong interest in experimental research, polymeric materials and nanocomposites is expected. Scientific rigor, autonomy, organizational skills and a strong interest in experimental work are desirable.

Personnes à contacter

Please send your application, including a CV, a motivation letter, and transcripts/grade records from the last two academic years, to:

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