Tailoring of the hierarchical structure within electrospun fibers due to supramolecular comb-coil block copolymers: polystyrene-block-poly(4-vinyl pyridine) plasticized by hydrogen bonded pentadecylphenol

Ruotsalainen, Teemu; Turku, Jani; Hiekkataipale, Panu; Vainio, Ulla; Serimaa, Ritva; Brinke, G. ten; Harlin, Ali; Ruokolainen, Janne; Ikkala, Olli

doi:10.1039/b701613a

Cited by 54 publications

(43 citation statements)

References 47 publications

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“…Similar distortion of copolymer domains upon electrospinning has been observed in bulk previously. 18 Routsalainen et al compared the phase of diblock copolymer structures evolved by annealing and electrospinning. The authors showed extended wormlike structures in electrospun fibers even if classical diblock structures are observed in the bulk state of polystyrene-block-poly(4-vinylpyridine).…”

Section: Resultsmentioning

confidence: 99%

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

et al. 2009

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Luminescent fibrous composite films consisting of submicrometer diameter fibers were prepared by electrospinning of segmented polycarbonate urethane (PCU) in dimethyl formamide and tri-n-octylphosphine oxide (TOPO)-capped CdSe nanocrystals (5 nm in diameter) in toluene. Using a pair of conductive electrodes separated with an air gap, we successfully produced randomly deposited and uniaxially aligned electrospun fibers. The surface structure of the electrospun fibers was studied using atomic force microscopy (AFM) and was compared to the corresponding film prepared by casting. In cast film, tapping mode AFM imaging suggests that hard urethane segments organize into rodlike morphology dispersed in soft polycarbonate. When PCU/CdSe dispersions were subjected to electrospinning, copolymer domains were forced to arrange into lamella along the fiber axis due to elongational flow and high stretching. Molecular orientation in the domains of the composite fibers was confirmed by polarized infrared spectroscopy. We demonstrated that formation of the oriented domains by electrospinning develops a hierarchical structure, which consequently modifies spectral properties because new multiple sharp lines appeared in the photoluminescence (PL) spectra of the fibers. In contrast to randomly deposited fibers, the PL intensity of uniaxially aligned fibers was found to be angle dependent. We propose that the elongated internal structure within the fibers controls the spontaneous emission of CdSe nanoparticles dispersed throughout the electrospun mat. A discussion on the nature of the controlled spontaneous emission is provided.

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Section: Resultsmentioning

confidence: 99%

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

et al. 2009

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“…Electrospinning (ES) has emerged as a new technique to produce various functional nanofibers9–12 because of its advantages of low cost, flexible morphological tuning and being a high‐throughput continuous production process. ES fiber morphology can be tuned through the modification of the spinneret to produce hollow, core/sheath, aligned and porous fibers 13–15. The electrical conductivity, field‐effect mobility, or photoluminescence of the conjugated polymer ES nanofibers have been found to be significantly different from those of spin‐cast films due to the fiber morphology characteristics 16–21.…”

Section: Introductionmentioning

confidence: 99%

Highly‐Aligned Electrospun Luminescent Nanofibers Prepared from Polyfluorene/PMMA Blends: Fabrication, Morphology, Photophysical Properties and Sensory Applications

Kuo

Wang

Chen

2008

Macro Materials & Eng

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Highly‐aligned luminescent electrospun nanofibers were successfully prepared from two binary blends of PFO/PMMA and PF+/PMMA. The PFO/PMMA aligned electrospun fibers showed a core/shell structure but the PF+/PMMA fibers exhibited periodic aggregate domains in the fibers. The aligned fibers had polarized steady‐state luminescence with a polarized ratio as high as 4, much higher than the non‐woven electrospun fibers or spin‐coated film. Besides, the PF+/PMMA aligned electrospun fibers showed an enhanced sensitivity to plasmid DNA. Such aligned electrospun fibers could have potential applications in optoelectronic or sensory devices.magnified image

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“…Electrospinning is a special spinning technique which leads to fibers with diameters down to the nanometer range . Electrospinning has been applied to block copolymer solutions and also in this case processing–structure relationships are far from being fully understood. For an example of structure formation in the case of highly deformed polymer melts see, for example, ref.…”

Section: Microphase Separation In Block Copolymersmentioning

confidence: 99%

Functional Macromolecular Systems: Kinetic Pathways to Obtain Tailored Structures

Abetz

Kremer

Müller

et al. 2018

Macro Chemistry & Physics

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This article aims to stimulate research on non‐equilibrium macromolecular systems, as nowadays a large toolbox to synthesize tailored macromolecules is available. A large variety of characterization methods covering a broad spectrum of length and timescales allows researchers to follow and also manipulate macromolecular systems on their paths toward equilibrium. These possibilities are paralleled by the development of new concepts of the statistical physics of non‐equilibrium phenomena in macromolecular systems as well as new models and algorithms for computer simulation.

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Tailoring of the hierarchical structure within electrospun fibers due to supramolecular comb-coil block copolymers: polystyrene-block-poly(4-vinyl pyridine) plasticized by hydrogen bonded pentadecylphenol

Cited by 54 publications

References 47 publications

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

Controlling Spontaneous Emission of CdSe Nanoparticles Dispersed in Electrospun Fibers of Polycarbonate Urethane

Highly‐Aligned Electrospun Luminescent Nanofibers Prepared from Polyfluorene/PMMA Blends: Fabrication, Morphology, Photophysical Properties and Sensory Applications

Functional Macromolecular Systems: Kinetic Pathways to Obtain Tailored Structures

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