Synthesis of a New Family of Polyelectrolytes From …
Suzuki coupling and Ni-catalyzed Yamamoto polymerizations were used to prepare conjugated polyelectrolytes based on n-type benzothiadiazole and benzotriazole unit backbone via a one-step synthesis, which started from their monomers with charged pendant ends. PBTBTz-SO3Na synthesized by Suzuki coupling polymerization showed a high M n value of 94 kDa, starting from the bilateral brominated benzotriazole and diboronic ester benzothiadiazole. The PBTBTz-SO3Na revealed aggregation phenomenon at the status of diluted solutions at optical absorption spectroscopy results. Dynamic light scattering (DLS) measurement provided evidence of negative solvatochromic effects of PBTBTz-SO3Na chains in solvents with lower polarity. While, PBTz-PyrBr, PBTz-TMABr, and PBTz-SO3Na which synthesized from Ni-catalyzed Yamamoto polymerizations of bilateral brominated benzotriazole units revealed higher molecular weight with PBTz-PyrBr, M n = 112 kDa; PBTz-TMABr, M n = 157 kDa; and PBTz-SO3Na, M n = 172 kDa, respectively. The ionic pendant groups of monomers have influence on the molecular weight of polymer based on benzotriazole backbone. The optical absorption spectroscopy and DLS measurements presented the negative solvatochromic effects of cationic-CPEs, PBTz-PyrBr, and PBTz-TMABr. Moreover, the UV-vis absorption of PBTz-TMABr displayed higher wavelength of solution (0.0167 mg/mL) than that of film, which was coated from its solution with concentration of 5 mg/mL. These studies displayed insights into the role of pendant ionic functionalities on the molecular weight and optoelectronic properties of the CPEs, which may find application in optoelectronic devices.
SYNTHESIS AND CHARACTERIZATION OF POLYELECTROLYTES
Polyelectrolytes have many applications, mostly related to modifying flow and improving the stability of aqueous colloids and gels or to induce agglomeration. For instance, they can be used to destabilize a colloidal suspension and to initiate flocculation and precipitation. They can also be used to impart a surface charge to neutral particles, enabling them to be dispersed in an aqueous solution. They are thus often used as thickeners, dispersant agents, conditioners, emulsifiers, ion-exchanger and clarifying agents. For example, they are used in water treatment as flocculation agents, in ceramic slurries as stablizing agents and in concrete mixtures as superplasticizers. Furthermore, many shampoos, soaps and cosmetics contain polyelectrolytes. Certain polyelectrolytes are also added to food products; for example, as food coatings and release agents. Examples are pectin (polygalacturonic acid), alginate (alginic acid), and carboxymethyl cellulose. All but the last are of natural origin.
Charged molecular chains commonly present in soft matter systems have a noticeable effect on the structure, stability and the interactions of various molecular assemblies. Theoretical approaches to describe their statistical properties differ profoundly from those of their electrically neutral counterparts. Many technological and industrial fields exploit their unique properties. Many biological molecules are polyelectrolytes. For instance, polypeptides and DNA’s are polyelectrolytes.
Synthesis and Properties of Two Cationic Narrow Band …
This three-volume set, is the first comprehensive handbook ever published bringing under a single cover all aspects of polyelectrolytes, their chemical synthesis, spectroscopic characterization, fabrication, processing into multilayers, self-assemblies, thin films and nanostructures, physical properties, solution behavior, theoretical models and industrial applications of polyelectrolytes currently studied in academic and industrial research.
Size-Controlled Synthesis of Magnetite Nanoparticles …
The synthesis of reticulated polyelectrolytes possessing ion-exchange properties, remains a topical task in chemistry. The constant widening of the application fields of such polymers in experimental studies and industry stipulates a more and more increasing interest to the problem of their preparation.
Journal of Nanoscience and Nanotechnology
Quenching experiments using a cyanine dye shows very efficient amplified quenching effect that is characteristic of conjugated polyelectrolyte. Possible applications of such particles include quantum dots and fluorescent sensors. At UNM, these particle are currently investigated for possible applications in light-activated bactericides.
Polystyrene sulfonate - Wikipedia
They have used this coupled framework to study a variety ofinteresting systems, as shown in these journal cover images. Thefirst is synthesis of carbon fibers from graphite which has beenliquified and evaporates due to a laser pulse. The second is a modelof a laser pulse inducing a shock which triggers exothermic chemistryin hydrogen peroxide. The final example models the creation ofprebiotic organic molecules via shock compression of icy materials,analogous to what may occur when a comet strikes the surface of theEarth.