Publicaties
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Particle-stabilized polymer blends KU Leuven
The effect of low-volume fractions of nanoparticles on the morphological processes and the rheological properties of immiscible blends are dis cussed. For blends of poly-isobutylene and poly-dimethylsiloxane stabilized by silica particles, particles help to suppress coalescence. Yet, particle bridging of different droplets has also been reported and leads to a slow build up of a gel-like structure, which could interfere with the morphology ...
Toughening and Stiffening in Thermoreversible Diels-Alder Polymer Network Blends Interuniversitair Micro-Electronica Centrum vzw Vrije Universiteit Brussel
The thermophysical properties, mechanical behavior, andhealingperformance of Diels-Alder-based polymer networks can be tunedwidely by changing the molar mass, functionality, and stoichiometricratio of the multifunctional diene (e.g., furan) and dienophile (e.g.,maleimide) monomers. Blending furan-functionalized monomers with ahigh and low molar mass opens a new dimension in tuning the propertiesof the resulting reversible polymer network blends ...
Analysis of bulk heterojunction organic solar cell blends by solid-state NMR relaxometry and sensitive external quantum efficiency - Impact of polymer side chain variation on nanoscale morphology KU Leuven Vrije Universiteit Brussel Universiteit Hasselt
White luminescence from single-layer devices of nonresonant polymer blends KU Leuven
Poly(9,9'-dioctyl fluorene) (F8) and poly(4,4'-diphenylene diphenylvinylene) (PDPV) are conjugated polymers with optical transitions that are nonresonant thanks to the particular structural features of PDPV that yield a very large Stokes' shift (similar to 1.14 eV) between absorption and emission spectra. We present steady-state and time-resolved photoluminescence (PL) experiments showing that F8:PDPV blends are "optically disconnected" systems ...
Transient interfacial tension and morphology evolution in partially miscible polymer blends KU Leuven
The influence of molecular weight asymmetry across an interface on the transient behavior of the interfacial tension is investigated for two different polymer combinations, polybutadiene (PBD)/polydimethylsiloxane (PDMS) and polybutene (PB)/PDMS. This choice ensures a minor diffuse interface using the first combination and a very diffuse interface in the latter case. Measurements of the interfacial tension as a function of time are carried out ...
Morphology Development of Immiscible Polymer Blends in Extensional Flows Developed within a Microfluidic Device KU Leuven
A microfluidic device was used to create precisely controlled drops of deionized water in polydimethylsiloxane oil and then study the morphological development of the drops in extensional flows under a series of different flow conditions. Nearly monodisperse drops were generated using a microfluidic hydrodynamic flowfocusing device. Once formed, the drops were driven through a contraction which deformed the drops. Two different types of ...