Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 306, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202100054
Keywords
hydrogen bonding; mechanical properties; montmorillonite; nanocomposites; RAFT polymerization; star polymers
Funding
- Projekt DEAL
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Matrix-free nanocomposite films of PMA and MMT nanosheets were developed to mimic the microscopic structure of nacre, and their mechanical properties were studied in detail through tensile testing. The experiments showed that the chain mobility of the surface-grafted polymer has a strong influence on the mechanical properties of the nanocomposite material.
Matrix-free nanocomposite films of poly(methyl acrylate) (PMA) and montmorillonite (MMT) nanosheets that imitate the microscopic structure of nacre are developed and their mechanical properties are studied in detail via tensile testing. The exfoliated MMT nanosheets are grafted with PMA via a grafting-through radical addition-fragmentation chain transfer polymerization in presence of a surface-anchored ionic monomer. The mechanical properties are precisely tailored a) via the variation of the degree of polymerization of the surface-grafted polymer, illustrating the impact of chain entanglement and the MMT content on the performance of the material, and b) via cross-linking of the surface-grafted polymer, either by partial change of the polymer topology from linear to star-shape or by the introduction of hydrogen-bonding units within the polymer. These experiments demonstrate the strong influence of the chain mobility of the surface-grafted polymer on the mechanical properties of the nanocomposite material.
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