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We report on amphiphilic diblock copolymer-decorated anisotropic silica nanotubes with well-defined dual functions of shape and surface properties in one nanocontainer. Amphiphilic poly(lactic acid)-block-poly(ethylene glycol) (PLA-b-PEG) diblock copolymers are covalently grafted to the surface of mesoporous silica nanotubes via silane chemistry and esterification. The released percentage of probe...
Poly(9-(2-(4-vinyl(benzyloxy)ethyl)-9H-carbazole)) (PVBEC) brushes, have been successfully prepared on the silicon surfaces via surface-initiated atom transfer radical polymerization (ATRP). Conductance switching at a voltage of about −2.1 V is observed in the memory device based on the PVBEC brushes. The fabricated device shows the good memory characteristics as the ON/OFF current ratio up to 10...
“Comb-like” graft copolymers, consisting of a poly((N-vinylcarbazole)-co-(4-vinylbenzyl chloride)) (P(NVK-co-VBC)) copolymer backbone from free radical polymerization and poly(((2-dimethylamino)ethyl methacrylate)-co-(tert-butyl acrylate)) (P(DMAEMA-co-tBA)) side chains from atom transfer radical polymerization (ATRP), were hydrolyzed to produce the acrylic acid (AAc)-containing “comb-like” graft...
Layer-aligned poly(vinyl alcohol)/graphene nanocomposites in the form of films are prepared by reducing graphite oxide in the polymer matrix in a simple solution processing. X-ray diffractions, scanning electron microscopy, Fourier-transform infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis are used to study the structure and properties of these nanocomposites...
Atactic poly(methyl methacrylate) (a-PMMA) nano-particles were prepared in three-component microemulsions using the cationic surfactant cetyltrimethylammonium bromide. To analyze the thermal history, the sub-T g annealed sample was subsequently measured at a faster heating rate. The a-PMMA prepared in microemulsions shows higher glass transition and higher structural relaxation than those...
Water sorption behavior in polyetherimide (PEI) modified diglycidyl ether bisphenol-A/4,4'-diaminodiphenyl sulfone (DGEBA/DDS) systems was investigated by gravimetric analysis, positron annihilation lifetime spectroscopy and scanning electron microscopy. The equilibrium water uptake showed strong composition-dependent, which suggested that hydrophilic groups rather than free volume were more significant...
Two kinds of reactive toughening accelerators for epoxy resin, amine-terminated chain-extended urea (ATU) and imidazole-terminated chain-extended urea (ITU) were synthesized from polyurethane prepolymer. Compared with the unmodified system, the curing activity, dynamic mechanical behavior, impact property and fracture surface morphology of the modified systems were systematically investigated. Results...
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