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An ethyl imidazolium-functionalized poly(arylene ether sulfone) (EI-PES) block copolymer was prepared as a novel anion exchange membrane. The EI-PES polymer was synthesized by polycondensation between the F- and OH-terminated oligomers, followed by benzylic bromination and imidazolium functionalization (homogeneous functionalization). The quaternary ammonium-functionalized PES (QA-PES) was also prepared...
Morphological changes caused by deformation and orientation of different domains of polystyrene-b-polybutadiene-b-poly(methyl methacrylate), SBM, triblock terpolymers were investigated using in-situ small angle X-ray scattering (SAXS), tensile testing, and transmission electron microscopy (TEM). Two sets of SBM triblock terpolymers with similar weight fractions of the three blocks were studied. The...
Highly transparent polyimide (PI) with a low coefficient of thermal expansion (CTE), comparable to that of copper foil (17 ppm/K), has been developed in conjunction with a relatively rigid and symmetrical monomer, trans-cyclohexyl diamine (CHDA), and in so doing we clarified the effectiveness of a multi-block copolymer system in terms of maximizing the degree of CTE reduction as well as mechanical...
Block copolymer lithography, a process where block copolymer self-assembly is integrated with conventional lithographic patterning, is emerging as a promising technology for addressing the future needs of the semiconductor industry. The ability of block copolymers to self-assemble into ordered nanodomains allows for simple, low cost nanopatterning into underlying substrates. Since its initial conception,...
Introduction of an insulating polystyrene block (BCP) polymethylmethacrylate copolymer (PS-b-PMMA) layer between the poly poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) and the photoactive layer (fullerene or functionalized fullerene/poly-3-hexylthiophene) has been reported to improve solar cell performance. We explore how the morphological structure of this ordered interfacial...
In this paper, the well-defined diblock copolymers consisting a linear polyethylene (LPE) and a poly(ethylene oxide) (PEO), LPE-b-PEO, were synthesized by combining the ethylene living coordination polymerization with fluorinated bis(phenoxyimine) titanium catalyst and the living ring-opening polymerization of ethylene oxide initiated by hydroxyl-terminated polyethylene (LPE–OH) as a macromolecular...
Carbon nanotubes have been extensively used in isotropic polymer media as mechanical reinforcements or as conductive fillers. New phenomena arise when the polymer matrix is made of an ordered block copolymer. Dispersions of nanotubes stabilized by block copolymers in selective solvents can be used to cast composite films in which the nanotubes are segregated in microdomains of the structured polymer...
3D nanostructured inorganic materials appear as promising candidates for various practical applications. Here we focus on metal nanofoams, a class of 3D nanomaterials uniquely combining the properties of metals and nanoporous materials, and review the recent developments in their preparation methods. Common approaches, such as dealloying, sol–gel synthesis, nanosmelting, combustion synthesis, etc...
In the present work, a poly(ε-caprolactone)-b-poly(ethylene oxide) (PCL-b-PEO) block copolymer was doped with LiClO 4 at various salt concentrations. The morphology of the hybrids was characterized with time-resolved small-angle X-ray scattering (SAXS). It is observed that LiClO 4 can induce microphase separation of the miscible PCL-b-PEO in the melt. With increase in doping ratio,...
Robust oil- and water-repellent or amphiphobic particulate coatings were prepared from epoxy glue and bi-functional silica particles bearing poly(2-perfluorooctylethyl methacrylate) (PFOEMA) and poly(acrylic acid) (PAA) coronal chains. To prepare the particles, silica was first co-grafted in a one-pot process by poly[3-(triisopropyloxysilyl)propyl methacrylate]-block-poly(2-perfluorooctylethyl methacrylate)...
Liquid chromatography at the critical condition (LCCC) method has been proposed as an attractive method to characterize individual blocks in block copolymers because it can make one block chromatographically “invisible” at the critical condition of its corresponding homopolymer. However, observable dependence of retention time on the “invisible” block length was reported in LCCC experimental studies...
Conjugated block copolymers represent a class of materials with potential applications in electronics and optoelectronics. Three block copolymer model compounds were made by first synthesizing 5-ethynyl-2,2′:5′,2″-terthiophene, 5-(2-propynyl)-2,2′:5′,2″-terthiophene and 5-(3-butynyl)-2,2′:5′,2″-terthiophene and then performing hydroboration polymerization from the alkyne of the terthiophene. The impact...
Poly(ε-caprolactones) (PCLs) belong to the first generation of synthetic aliphatic polyesters. Their biodegradability motivated their extensive exploration as resorbable materials, particularly in controlled drug release applications. While PCL fell out of fashion due to the increasing popularity of shorter chain polyglycolides and derivatives, there has been a noticeable renewed interest in ε-caprolactone...
The solvent annealing induced two-dimensional ordering in poly(styrene–ethylene/butylenes–styrene) (SEBS) triblock copolymer sub-monolayer films with a thickness of 16 nm equaling half of the bulk domain thickness l 0 was investigated by time-resolved ex-situ atomic force microscopy (AFM). Cyclohexane, a selective solvent for majority poly(ethylene/butylenes) block was used. The detailed pathway...
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