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In this paper, we used electrospinning to fabricate electret polyvinylidene fluoride (PVDF) membranes that show tremendous potential for its use as a high-performance air filter medium. A novel charge storage enhancer by means of nanoscale graphite platelets (NGP) dispersed within the fibrous matrix and the filtration performance were investigated. The surface potential of as-spun membrane was characterized...
Three half-titanocene complexes 2a-3a bearing dibenzhydryl-substituted aryloxide ligands CpTiCl2(O-2,6-Ph2CHC6H2-4-Me), 2a; CpTiCl2 (O-2,6-Ph2CHC6H2-4-OMe), 2b; Cp*TiCl2(O-2,6-Ph2CHC6H2-4-Me), 3a were synthesized. All the complexes were characterized by NMR spectroscopy and elemental analysis. The molecular structures of complex 2a and 2b were further determined by single crystal X-ray diffraction,...
Nitrile rubber (NBR) is an unsaturated copolymer of acrylonitrile and butadiene. Due to its excellent oil-resistance, NBR products are widely used such as in the automotive and aerospace industries. This paper discusses the fabrication of acrylonitrile butadiene copolymer fibers via electrospinning. A transition from electrospray to electrospinning mechanism was observed and investigated by varying...
We extended self-consistent field theory to study the phase behavior of supramolecular blends of diblock copolymers with hydrogen-bonding interactions. The hydrogen-bonding interactions are described by Yukawa potentials. The hydrogen-bonding donors and acceptors were modeled as two blocks smeared with opposite screened charges. Hierarchical microstructures such as parallel and perpendicular lamellae-in-lamellae...
Hierarchically ordered microstructures, self-assembled from copolymers, have drawn considerable attentions in the last decades. Study of hierarchical microstructure impacts many realms such as material engineering and biology science. In this article, notable recent advances in the fields of hierarchical polymeric microstructures generated in either bulk or selective solvents are highlighted, from...
A new method to synthesize graft polymer with controlled graft density (Ğ) through the coupling reaction between the appending β-keto ester and the terminal amine is proposed. Following this method, the backbone polymer of poly[2-(acetoacetoxy) ethyl methacrylate] (PAEMA) containing the appending β-keto ester is synthesized by reversible addition-fragmentation chain transfer polymerization and the...
A new method to achieve well-controlled surfactant-free aqueous RAFT polymerization of styrene initiated by K 2 S 2 O 8 in the presence of CaCO 3 particles was proposed. It was found that the hydrophobic monomer of styrene was adsorbed on the surface of CaCO 3 particles and well-controlled surfactant-free aqueous RAFT polymerization mediated with the RAFT agent...
Conjugated polymers (P1, P1L and P2–P5) constructed by alkynyl-substituted aniline and substituted arene analogs could be synthesized through Pd-catalyzed Sonogashira coupling. The responsive optical properties of poly(2-ethynyl aniline) (P1 and P1L for different molecular weights, P1L with longer chains on average) toward various metal ions (including Ni 2+ , Ag + , Cu 2+ ...
Honeycomb-patterned films can be facilely prepared by the breath figure method. However, it is still ambiguous how the polymer structure affects the morphologies of the films. In this work, poly(styrene-co-2-(2-,3-,4-,6-tetra-O-acetyl-β-d-glucosyloxy) ethyl methacrylate) (PS-co-AcGEMA) with well-defined linear and/or comb-like structures were synthesized by atom transfer radical polymerization (ATRP)...
Three-dimensionally ordered macroporous polyethylenes (3DOM PE) with pore size ranging from 135nm to 410nm were prepared using supported catalysts on the surface of silica microsphere as template, followed infiltration of gaseous ethylene and polymerization. The morphology of 3DOM PE was characterized by SEM and the reflectance spectrum was recorded by UV–vis. It is shown that the pores are uniform,...
Three-dimensionally ordered macroporous(3DOM) syndiotactic poly(p-methylstyrene) (sPPMS) with pore size 170nm was fabricated by means of silica templates using (dbm) 2 Ti(OPh) 2 /MAO catalytic system. The resulting polymers were characterized by SEM, 13 C NMR, DSC and GPC. The results indicated that the 3DOM sPPMS were highly syndiotactic. GPC curves showed that the 3DOM sPPMS...
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