3 results
Filters
Settings
Now showing1 - 3 of 3
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Hydrophobic aerogels from vinyl polymers derived from radical polymerization : proof of concept(Wiley, 2024-06-14); ; ; ; Hydrophilicity is one important drawback of bio-based aerogels. To overcome this issue, a novel approach for the preparation of mesoporous, water repellent aerogels is introduced, which combines synthesis of crosslinked bio-based copolymers from methacrylate copolymerizations, followed by solvent exchange and supercritical drying steps. The influence of monomers with different non-polar ester groups (methyl, vanillin, tetrahydrofurfuryl) on textural properties and water contact angles of the dry products is assessed. Final aerogels show generally high overall porosities (∼ 96%), low densities (0.07 – 0.11 g cm−3) as well as fine, mainly mesoporous networks, and specific surface areas in the range of 120 – 240 m2 g−1. Hereby, choice of the methacrylate ester groups results in differences of the resulting pore-size distributions. Water repellency tests show stable static water contact angles in the hydrophobic range (∼ 100 °) achieved for the substrate containing the vanillin ester group. On the contrary the other substrates absorb water quickly, which indicates a decisive role of the ester group. The presented approach opens up a new pathway to bio-based aerogels with intrinsic hydrophobicity. It is suggested that the properties are tailored by the choice of the monomer structure, hence enabling further adaption and optimization of the products.Publicationtype: Journal Article40 76 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Macromolecular structures for electronics, optoelectronics and energy storage(2023-12-03); Macromolecular materials play a pivotal role in (opto)electronic and energy storage applications. Achieving high performance materials necessitates a profound comprehension of the intricate interplay between macromolecular structures and (electronic)function. One illustrative case is the design of polymers tailored for electron transport as semiconductors or conductors, which often features an extended 𝜋-conjugated system, triggering a cascade of necessary design rules and limitations. The research into these structure-function interdependencies is highly dynamic and our understanding of them is constantly evolving, allowing us to continuously increase material performance and also to devise new applications. At the same time, new developments and emerging applications are expanding the spectrum of criteria used to evaluate material performance. The parameter space that must be considered now encompasses interactions with biological systems throughout and beyond the device’s lifespan, i.e., markers of biocompatibility and transience. Once again, understanding the structure–function relationships is crucial. This understanding becomes paramount, for instance, in achieving the delicate balance between ion permeability and electron transport for inter-facing with biological tissues, modulating the Young’s modulus of a polymeric semiconductor for wearables, or to include structurally weak points in the molecular system to facilitate controlled degradation or recycling. This special issue on “Macromolecular Structures for Electronics, Optoelectronics, and Energy Storage” features a collectionof 13 research papers and 3 review articles. These contributions delve into various facets of the relationship between macromolecular structure and function, collectively underscoring the essential nature of a comprehensive understanding of this interdependency in the pursuit for high performance materials. Examples are provided across the diverse fields of polymer synthesis, processing (including 3D techniques), controlled degradation, and application-driven investigations spanning photovoltaics, energy storage, wearable electronics and logic circuitsPublicationtype: Editorial41 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Combinatorial Synthesis of Peptoid Arrays via Laser-Based Stacking of Multiple Polymer Nanolayers(2019-03-01); 10