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Fracture Mechanics of Nanostructured Polymer Blends with Janus Particles

For the first time, novel Janus nanoparticles (JPs) were used in sufficiently large quantities for industrial scale blend compatibilization experiments. Several 100 g batches of JPs were prepared and successfully employed as compatibilizers in technologically relevant poly(2,6- dimethyl-1,4-phenylene ether)/poly(styrene-co-acrylonitrile) (PPE/SAN) blends. The obtained small PPE droplet sizes of less than 300 nm greatly outperformed the co-continuous neat blend but also the blend compatibilized with a linear SBM (polystyreneblock- polybutadiene-block-poly(methyl methacrylate)) triblock terpolymer as benchmark material. This clearly shows the outstanding performance of JPs as compatibilizers in polymer blends. Fracture mechanics analysis of JP compatibilized blends revealed significantly stronger interface bonding compared to the neat and SBM compatibilized blends. The JP compatibilized blends show higher strength and stiffness at the interface compared to the SBM compatibilized blends, which results in lower toughness of the material when used solely in the blend as compatibilizers. However, it is possible to tailor the nano/micro structure via a combination of JPs and SBM triblock terpolymers to tune the macro properties such as toughness. Combination of JPs with a SBM triblock terpolymer as compatibilizer in the blend resulted in a fine morphology with small PPE droplets with radius of 100 nm, which homogenized the deformation in the blend. The toughness as well as resistant against crack growth of the blend was significantly improved over a wide range of crack propagation rates, revealing the synergistic effect of a reduced PPE domain size (mediated by JPs) and an elastic interface (mediated by the SBM triblock terpolymer). As an outlook, JPs were also employed in foaming PPE/SAN blends to observe their potential as highly active foam nucleating agents.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Ronak Bahrami

Ronak Bahrami
Fakultät für Ingenieurwissenschaften
Universität Bayreuth

Information

Free keywords: Polymer Blends, Janus Particles, Fracture Mechanics, Nanostructured Blends, Polymer Foams
Institute / chair: Lehrstuhl für Polymere Werkstoffe der Universität Bayreuth
Language: English
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt, Prof. Dr. Axel HE. Müller
Publication year: 2018
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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