A Combined Theoretical and Experimental Study of the Polymer Matrix-Mediated Stress Transfer in a Cellulose Nanocomposite
| Autor: | Aleksandar Y. Mehandzhiyski, Linda Sandblad, Leo Svenningsson, Christian Müller, Igor Zozoulenko, Giada Lo Re, Lars Evenäs, Anna Peterson, Anja Lund, Roland Kádár, Agnieszka Ziolkowska |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Composite number 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry Matrix (chemical analysis) Stress (mechanics) chemistry.chemical_compound Materials Chemistry Polymerkemi Cellulose Ionomer Polymer Technologies chemistry.chemical_classification Acrylate Nanocomposite Organic Chemistry Polymer 021001 nanoscience & nanotechnology Polymer Chemistry Polymerteknologi 0104 chemical sciences chemistry Chemical engineering 0210 nano-technology |
| Popis: | We study composites of cellulose nanocrystals (CNCs) in an ionomer matrix of poly(ethylene-stat-sodium acrylate) and find that direct cellulose/cellulose interactions in the composite are not a requirement for achieving reinforcement. While isotropic composites only show a slightly enhanced stiffness compared to the neat ionomer, a more substantial increase in Youngs modulus by a factor of up to 5 is achieved by uniaxial alignment of the composites through melt spinning. The orientation of CNC in melt-spun composites reduces the probability of cellulose/cellulose interactions, which suggests that cellulose/polymer interactions must be present that lead to the observed reinforcement. Molecular dynamics simulations confirm strong cellulose/polymer interactions in the form of ionic interactions as well as hydrogen bonding. These cellulose/polymer interactions facilitate efficient stress transfer, leading to the high reinforcing effect of CNC, while cellulose/cellulose interactions play a minor role in the mechanical response of the composite. Funding Agencies|Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RMA15-0052]; Swedish Research Council FormasSwedish Research CouncilSwedish Research Council Formas [FR-2018/0010]; Treesearch; Chalmers University of Technology Foundation; Swedish Research CouncilSwedish Research CouncilEuropean Commission [2018-06487 RFI NanoSPAM] |
| Databáze: | OpenAIRE |
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