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A new diamine, bis(4-((4-aminophenyl)thio)phenyl)(phenyl)phosphine oxide (BATPO), containing phosphine oxide and thioether bonds was prepared via the Grignard reaction to dichlorophenylphosphine oxide with 4-fluorophenylmagnesium bromide, followed by an aromatic substitution reaction with 4-aminothiophenol. The polyimides (PIs) were synthesized by the conventional two-step polycondensation from several...
We investigate crack propagation in a simple two-dimensional visco-elastic model and find a scaling regime in the relation between the propagation velocity and energy release rate or fracture energy, together with lower and upper bounds of the scaling regime. On the basis of our result, the existence of the lower and upper bounds is expected to be universal or model-independent: the present simple...
The dodecanethiol-modified molybdenum disulfide (OMoS2) was used as template to form a layered OMoS2MgCl2-supported Ziegler–Natta catalyst via a co-agglomeration method. The effects of OMoS2 on the catalyst morphology and ethylene polymerization behavior were examined. The resultant polyethylene (PE)/OMoS2 nanocomposites mirrored the catalyst morphology, and the OMoS2 fillers were well dispersed in...
This paper reports the fabrication of conductive polypyrrole (PPy)-SiO2 hybrid thin films having a flat surface (surface roughness value < 10 nm) through vapor phase polymerization (VPP) of pyrrole and tetraethyl orthosilicate (TEOS) on a ferric p-toluenesulfonate-coated substrate. Substantial improvement in the physicochemical and electrical properties of the hybrid film, compared to those of...
We develop an advanced electrospinning process that uses an electrostatic spiral collecting coil and a converging coil to produce a polyacrylonitrile (PAN) polymer fiber with a nanometer-sized diameter. The electrostatic spiral collecting coil was used as a collector on which to deposit a continuous and aligned PAN polymer fiber, and the converging coil was used to adjust the collecting area of the...
In this study we synthesized medium-band gap, two-dimensional (2-D) conjugated polymers comprising electron-rich benzo[1,2-b:4,5-b′]dithiophene (BDT) units presenting conjugated thiophene (T) side chains and electron-deficient alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties. We introduced various solubilizing substituents—linear alkyl, alkoxy, and alkythio units—on the thiophene side chains to...
Basic fibroblast growth factor (bFGF)-encapsulated poly(ε-caprolactone) (PCL) nano/microfibrous scaffolds were fabricated to improve cell viability and tissue regeneration. bFGF-encapsulated PCL nanofibers and microfibers were fabricated by emulsion electrospinning and melt-electrospinning, respectively. Electrospinnability of emulsions was improved with the addition of Pluronic F-127 because emulsions...
Controlling solid-state order of π-conjugated polymers through macromolecular design is essential for achieving high electronic device performance. Our work investigates the various effects of polymer structure on solid-state packing, especially, regarding polymer-packing orientation (edge-on vs. face-on). Various number of thiophene-containing isoindigo polymers (P4TI, P4TI-3, P4TI-4, P6TI-3 and...
Nanofibers have gained increasing attention because of their potential for a wide range of applications. In order to fully exploit the potential of nanofibers, there is a need to understand the relationship between the mechanical properties, especially tensile properties, of an individual nanofiber and that of nanofiber assemblies. In this study, we examined the relationship between a single nanofiber...
Sulfonated poly(arylene ether sulfone) (SPAES) based composite membranes were prepared with core–shell silica particles having poly(4-styrenesulfonic acid) and poly(4-vinylpyridine) in shell layers named S–Si and P–Si, respectively, to investigate the effect of acidic and basic silica fillers on membrane properties. The core–shell silica particles were obtained by hydrolysis of vinyltrimethoxysilane...
The ultrafast charge carrier dynamics of alkyl-substituted thienylenevinylene and phtalimide-based donor/acceptor (D/A) alternating copolymer (PTVPhI-Eh) as well as PTVPhI-Eh:PC 71 BM bulk heterojunctions (BHJs) with and without processing 1-chloronaphthalene (CN) additive have been studied by means of a femtosecond transient absorption (TA) measurement. Photo induced absorption of the D/A...
Carbonization at high temperature can significantly increase the conductivity of polyaniline nanofibers (PANF) but the created carbonized surface is too hydrophobic for Pt-loading. Sulfonic acid groups are then grafted on the carbonized PANF by ultra-sonication in concentrated sulfuric acid to increase the surface hydrophilicity and Pt-loading. The obtained sulfonated carbonized PANF was found to...
Electromagnetic interference shielding effectiveness (EMI SE) of multifunctional Fe 3 O 4 /carbon nanofiber composites in the X-band region (8.2–12.4 GHz) is studied. Here, we examine the contributing effects of various parameters such as Fe 3 O 4 content, carbonization temperature and thickness on total shielding efficiency (SE total ) of different samples...
Biocompatible poly(ε-caprolactone)-b-poly(vinyl alcohol) (PCL-b-PVA), poly(δ-valerolactone)-b-PVA, and poly(trimethylene carbonate)-b-PVA block copolymers were synthesized at 30 °C using a hydroxyl-functionalized xanthate reversible addition-fragmentation chain transfer (RAFT) agent, 2-hydroxyethyl 2-(ethoxycarbonothioylthio)propanoate, as a dual initiator for ring-opening polymerization (ROP) and...
The dynamic mechanical properties of poly(styrene-co-Na tiglate) PSTANa, poly(styrene-co-Na methacrylate) PSMANa, and poly(styrene-co-Na acrylate) PSAANa ionomers were investigated to know the effect of the number of methyl groups of the acrylate unit on the mechanical properties and morphology of those ionomers. It was found that the ionic modulus of the PSTANa ionomers was much lower than that of...
In this study, anion exchange membranes having various quaternary ammonium groups were prepared by using a radiation-induced graft polymerization method and followed by subsequent treatment of films with amines. FT-IR and SEM-EDX techniques were employed to monitor the reaction progress. The cross-sectional distribution of the anionic exchange functional groups through the membranes has also been...
Two thermally, dimensionally stable aromatic polyimides (PIs) of triphenylamine derivatives bearing electron-accepting bis(trifluoromethyl)phenyl group and electron-donating bithiophene group were synthesized with reasonably high molecular weights. These PIs in nanoscale thin films were investigated in aspects of morphological structure and interfaces in contact with substrates and metal electrodes...
The RITP (reverse iodine transfer polymerization)-dispersion polymerization of methyl methacrylate (MMA) was conducted and the molecular weight and SEM images of them were investigated to propose the mechanism of the formation of surface morphology in crosslinked polymers. The morphology of the crosslinked particles varied depending on the sorts and contents of the crosslinking agents and iodine....
Crosslinkable ruthenium complex dye, Ru(2,2′-bipyridine-4,4′-bicarboxylic acid)(4,4′-bis((4-vinyl benzyloxy)methyl)-2,2′-bipyridine)(NCS) 2 (denoted as Ru-S dye), was synthesized and characterized using 1 H-NMR, 13 C-NMR, Fourier transform infrared (FTIR) and UV/vis spectroscopies.The power conversion efficiency of dye-sentitized solar cell (DSSC) using Ru-S and liquid electrolyte...
Within small molecules, the hydrogen-bonding behaviors affected by delocalization have been studied thoroughly, but rare publication in macromolecules. Therefore, three poly(N-phenyl methacrylamide)s, poly(N-phenyl methacrylamide) (PNPAA), poly(N-4-methoxyphenyl methacrylamide) (PMPMA) and poly(N-4-bromophenyl methacrylamide) (PBPMA), with different inductive substitution at para position of benzene...
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