A Novel Method for Studying the Dynamics of Confined Polymers in Nanoparticles in Nanoblends - Condensed Matter > Soft Condensed MatterReport as inadecuate




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Abstract: The advances in new technologies have prompted the need for functionalsystems smaller than the gyration radius of polymer chains. Thus, understandinghow nanoconfinement affects polymer properties has been the focus of a lot ofresearch for over a decade. Polystyrene in particular has been reported to bestrongly affected when nanoconfined as a thin film and specifically its glasstransition temperature Tg is reported to decrease with decreasing filmthickness. Tremendous effort has been dedicated to developing methods forquantifying the large-scale dynamic of nanoconfined polymers: film dewetting,film contraction, nanobubble inflation, nanoparticle imbedding and healing ofdeformed surfaces etc. In this work we describe a novel method to study thelarge scale dynamic and nanomechanical properties of nanoconfined polymers innanoparticles in nanoblends. Nanoblends of dPS-PBMA were prepared from amixture of colloidal suspensions of cross-linked PBMA and traces of dPSnanoparticles via water evaporation. The polymer blends were prepared attemperatures well below the glass transition of PS TgPS and above the Tg ofcross-linked PBMA particles TgPBMA. In these conditions we expect the PBMAparticles to deform under capillary pressure to fill the interstices betweenthem and the glassy PS nanoparticles to remain spherical. During thepreparation of the nanoblends the elastic energy is stored within the deformedcross-linked PBMA nanoparticles. Upon annealing the films above TgPS, the PBMAnanoparticles regain their spherical shape and release the stored elasticenergy, which induces the deformation of the PS nanoparticles. Small angleneutron scattering is then used to monitor the shape evolution of the PSnanoparticles and to quantify the relaxation dynamics of the polystyrenenanoparticles.



Author: Fabrice Cousin LLB, Jérémie Gummel LLB, Daniel Clemens, Isabelle Grillo ILL, François Boué LLB

Source: https://arxiv.org/



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