4 resultados para Transfer Raft Polymerization

em AMS Tesi di Laurea - Alm@DL - Università di Bologna


Relevância:

80.00% 80.00%

Publicador:

Resumo:

Sono stati sintetizzati materiali polimerici contenenti complessi di iridio luminescenti. In particolare è stato messa a punto una via sintetica per la funzionalizzazione del gruppo terminale di catene metacriliche ottenute mediante ATRP.

Relevância:

80.00% 80.00%

Publicador:

Resumo:

An investigation on the synthesis and properties of ferrocene-containing methacrylate monomer and polymer was carried out. Block copolymers of Ferrocenylmethyl Methacrylate with methyl, butil and esil methacrylate, were also prepared. The side-chain ferrocene-containing polymers and copolymers were prepared via atom transfer radical polymerization (ATRP). The glass transition temperature (Tg) values of the polymers and copolymers were measured by differential scan calorimetry (DSC).The thermal degradation behavior of copolymers was also studied and compared with the respective homopolymers. Cyclic voltammetry was employed to study the electrochemical properties. Preliminar electrochemical studies with a glassy carbon and Indium Tin Oxide electrodes modified with ferrocene-polymer conducted in aqueous and organic media are reported.

Relevância:

40.00% 40.00%

Publicador:

Resumo:

This thesis work is part of a larger synthesis project about alkyd resins from natural sources, copolymerized with methyl acrylate and n-butyl acrylates, which wil be used for coatings purpose. The aim is to control the copolymerization of methyl acrylate and n-butyl acrylate in RAFT miniemulsion. The research was divided into three parts. First the homopolymerization of methyl methacrylate and n-butyl acrylate was studied by varying different parameters such as the amount of surfactant, the amount of initiator, pH, and especially the RAFT agent. Then two macro RAFT agents were synthesized, as suggested by the existing literature. Finally, the two monomers were copolymerized using both the RAFT used for the homopolymerization and those synthesized in the second stage. To verify the obtained control over the polymerization, the synthesized polymers were analyzed by gel permeation chromatography, GPC, thus finding their molecular weight and its polydispersity.

Relevância:

30.00% 30.00%

Publicador:

Resumo:

Le tecniche di polimerizzazione radicalica vivente hanno acquisito negli ultimi anni grande risonanza presso la comunità scientifica, grazie alla loro versatilità sia in termini di monomeri utilizzabili, che di condizioni operative. Oltre a ciò, esse permettono un buon controllo del peso molecolare e della struttura chimica del polimero e prevedono anche la possibilità di funzionalizzare facilmente i gruppi terminali delle catene. Tra queste tecniche, la Reversible Addition–Fragmentation chain Transfer polymerization (RAFT) risulta essere una delle più conosciute ed utilizzate, in quanto permette di ottenere materiali funzionalizzati con architetture molecolari particolarmente sofisticate e/o strutture in grado di autoorganizzarsi spazialmente. In questo contesto, sono stati sintetizzati mediante RAFT dei copolimeri anfifilici contenenti cromofori azobenzenici, in grado di autoassemblarsi in micelle sensibili a stimoli esterni, quali variazioni di temperatura e irraggiamento luminoso ad una adeguata lunghezza d’onda.