FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3046005148> ?p ?o ?g. }

• W3046005148 abstract "The aim of this thesis was to prepare and investigate the electrospun fiber assemblies in different dimensions from one-dimensional (1D) fibrous yarns, two-dimensional (2D) fibrous membranes to three-dimensional (3D) fibrous sponges. The underlying concept was to organize the fiber alignment, hierarchical structures and interactions including the macroscopic fibril orientation in the yarns, the interconnection between the fibrils and the macromolecular orientation in the fibrils. Some designed strategies were carried out to pursue different performance in these electrospun fiber assemblies.There is an intrinsic conflict in materials science between high strength and toughness, which is achieved in man-made single polymer nanofibers with ultrasmall diameter (less than 100 nm) by electrospinning. However, these single nanofibers are not robust enough to handle real-world applications. Natural fibers, such as dragline and recombinant spider silk, achieve the combination of high strength and toughness as well but their applicability is limited by either low availability or high prices for various applications. A straightforward concept to combine high strength and toughness was presented through the preparation of 1D polyacrylonitrile (PAN) fibers by yarn electrospinning, which creates fibers consisting of thousands of aligned fibrils in combination with a specified amount of a interconnecting linker – poly(ethylene glycol) bisazide (PEG-BA) (Section 2.1). Stretching at 160 °C with a stretch ratio of eight times could induce a high alignment of fibrils, and the adjacent annealing at 130 °C for 4 h under tension could lead to an azide cycloaddition reaction between the nitrile groups of PAN and bisazide groups of PEG-BA. The microstructures and crystal orientation of yarns with different stretch ratios at 160 °C were characterized by scanning electron microscopy (SEM), polarized Raman spectroscopy, wide/small-angle X-ray scattering and in situ X-ray diffraction measurements. The yarns obtained have a high tensile strength of 1236 ± 40 MPa, a modulus of 13.5 ± 1.1 GPa and a high toughness of 137 ± 21 J/g, which are similar properties to those of dragline spider silk. Furthermore, designed 2D polarized photoluminescent fibrous membranes from non-conjugated polymer were prepared and investigated, as shown in the Section 2.2. We designed three main rules for developing polarized photoluminescent materials from low-cost and easy-processable non-conjugated polymers or aggregation-induced emission (AIE) polymers: i) Electrospinning the non-conjugated or AIE polymer (PAN) into 2D fibrous membrane, ii) aligning the crystal arrangement by sufficient heat-stretching at 160 °C with a stretch ratio at 6 times, and iii) using functional cyano groups that show light-emitting when interactions between adjacent cyano groups lead to the formation of a more extended π-system. The obtained fibrous membrane exhibited a photoluminescence quantum yield of 30–32 %, which is remarkable for a simple non-conjugated polymer. Due to the…" @default.
• W3046005148 created "2020-08-03" @default.
• W3046005148 creator A5026739704 @default.
• W3046005148 date "2020-07-27" @default.
• W3046005148 modified "2023-09-23" @default.
• W3046005148 title "Preparation and Properties of Electrospun Polyacrylonitrile Fiber Assemblies" @default.
• W3046005148 doi "https://doi.org/10.15495/epub_ubt_00004965" @default.
• W3046005148 hasPublicationYear "2020" @default.
• W3046005148 type Work @default.
• W3046005148 sameAs 3046005148 @default.
• W3046005148 citedByCount "0" @default.
• W3046005148 crossrefType "dissertation" @default.
• W3046005148 hasAuthorship W3046005148A5026739704 @default.
• W3046005148 hasConcept C127413603 @default.
• W3046005148 hasConcept C144796933 @default.
• W3046005148 hasConcept C159985019 @default.
• W3046005148 hasConcept C185592680 @default.
• W3046005148 hasConcept C192562407 @default.
• W3046005148 hasConcept C27523624 @default.
• W3046005148 hasConcept C2776056205 @default.
• W3046005148 hasConcept C2777516009 @default.
• W3046005148 hasConcept C42360764 @default.
• W3046005148 hasConcept C519885992 @default.
• W3046005148 hasConcept C521977710 @default.
• W3046005148 hasConcept C55493867 @default.
• W3046005148 hasConcept C64208038 @default.
• W3046005148 hasConcept C91129048 @default.
• W3046005148 hasConcept C99595764 @default.
• W3046005148 hasConceptScore W3046005148C127413603 @default.
• W3046005148 hasConceptScore W3046005148C144796933 @default.
• W3046005148 hasConceptScore W3046005148C159985019 @default.
• W3046005148 hasConceptScore W3046005148C185592680 @default.
• W3046005148 hasConceptScore W3046005148C192562407 @default.
• W3046005148 hasConceptScore W3046005148C27523624 @default.
• W3046005148 hasConceptScore W3046005148C2776056205 @default.
• W3046005148 hasConceptScore W3046005148C2777516009 @default.
• W3046005148 hasConceptScore W3046005148C42360764 @default.
• W3046005148 hasConceptScore W3046005148C519885992 @default.
• W3046005148 hasConceptScore W3046005148C521977710 @default.
• W3046005148 hasConceptScore W3046005148C55493867 @default.
• W3046005148 hasConceptScore W3046005148C64208038 @default.
• W3046005148 hasConceptScore W3046005148C91129048 @default.
• W3046005148 hasConceptScore W3046005148C99595764 @default.
• W3046005148 hasLocation W30460051481 @default.
• W3046005148 hasOpenAccess W3046005148 @default.
• W3046005148 hasPrimaryLocation W30460051481 @default.
• W3046005148 hasRelatedWork W1191197695 @default.
• W3046005148 hasRelatedWork W2008258405 @default.
• W3046005148 hasRelatedWork W2045223094 @default.
• W3046005148 hasRelatedWork W2049544036 @default.
• W3046005148 hasRelatedWork W2063555603 @default.
• W3046005148 hasRelatedWork W2083952515 @default.
• W3046005148 hasRelatedWork W2090232128 @default.
• W3046005148 hasRelatedWork W2224593375 @default.
• W3046005148 hasRelatedWork W2247335572 @default.
• W3046005148 hasRelatedWork W2367705364 @default.
• W3046005148 hasRelatedWork W2559034957 @default.
• W3046005148 hasRelatedWork W2765855077 @default.
• W3046005148 hasRelatedWork W2891775392 @default.
• W3046005148 hasRelatedWork W3023927759 @default.
• W3046005148 hasRelatedWork W3034886904 @default.
• W3046005148 hasRelatedWork W3088036917 @default.
• W3046005148 hasRelatedWork W3151335487 @default.
• W3046005148 hasRelatedWork W3168830833 @default.
• W3046005148 hasRelatedWork W3212345359 @default.
• W3046005148 hasRelatedWork W2186804723 @default.
• W3046005148 isParatext "false" @default.
• W3046005148 isRetracted "false" @default.
• W3046005148 magId "3046005148" @default.
• W3046005148 workType "dissertation" @default.