Two types of hollow fluorescent nanoparticles were prepared by plasma polymerization of pyrrole: nanoparticles with a single hollow core and nanoparticles with a core composed of small bubbles.
This paper presents a plasma polymerization of trichloroethylene with the objective to study the formation of micro-and mesostructures in the polymers. Under plasma conditions, these polymers have a great potential of building complex self-assembled structures with electrical characteristics ranging from chlorined polyethylenes to polyacetylenes. The polymerization of trichloroethylene was studied with combinations of resistive, capacitive, and inductive electric configurations. Low-power syntheses used dc-and radio-frequency (RF)-resistive mechanisms and resulted in partially soluble polymers with conductivity in the 10 −12 −10 −5 -S/cm interval. On the other hand, polymers synthesized at high power with a combined RF inductive-capacitive configuration were almost insoluble with conductivity in the 10 −12 −10 −11 -S/cm interval. The morphology of polychloroethylene varied from smooth surfaces to agglomerates composed with micro-and mesostructures with mushroomlike profiles, which were very sensitive to the conditions of synthesis.
Nanoparticles can be produced by plasma polymerization from different precursors at low or atmospheric pressure. The polymers produced by plasma polymerization are not chemically regular as conventional polymers; they are complex and rich in functional groups. The variety of chemical groups is due to the fragmentation of the precursor as well as other gases present during the reaction. The concentration of these groups on the nanoparticle surface can be tuned by changing plasma polymerization variables. In this work we demonstrate the preparation of nanoparticles by plasma polymerization of poly(ethylene glycol), poly(ethylene glycol) copolymerized with pyrrole, and hexamethyldisiloxane. Nanoparticles were characterized by transmission electron microscopy and infrared spectroscopy.
This work presents the synthesis by plasma and characterization of luminescent polymer thin films of dibenzothiophene (DBT) by plasma polymerization. The DBT is solid at room conditions and was sublimated and introduced to the plasma reactor to produce the chemical reactions with the vapors. The results indicated the production of polymers with benzene and thiophene rings in the structure as well as methylene groups. The polymer structure was studied by Fourier transform infrared spectroscopy and 13 C-CPMAS. The thermal analysis showed a residual mass of 60% at 800 C, which suggests a great thermal resilience in the polymer. The critical superficial tension was calculated with a Zisman plot and was 25 mN/ m. The polymer has a fluorescent green emission between 400 and 660 nm and an orange emission between 660 and 850 nm. This effect can be a consequence of the electronic distribution along the structure in aliphatic and aromatic segments with benzene and thiophene rings.
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