Copolymer based on lauryl methacrylate and poly(ethylene glycol) methyl ether methacrylate as amphiphilic macrosurfactant: Synthesis, characterization and their application as dispersing agent for carbon nanotubes
| Autor: | Gisela Díaz, Daniel López, Agustín Iborra, Juan M. Giussi, Omar Azzaroni |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Dispersity Carbon nanotubes General Physics and Astronomy 02 engineering and technology 010402 general chemistry Methacrylate 01 natural sciences Dispersant Micelle chemistry.chemical_compound Copolymer Amphiphile Polymer chemistry Materials Chemistry chemistry.chemical_classification Otras Ciencias Químicas Organic Chemistry Ciencias Químicas Polymer Química 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry MACROSURFACTANTS AMPHIPHILIC COPOLYMERS 0210 nano-technology Ethylene glycol CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | The use of amphiphilic macrosurfactants as emulsifying agents has shown to have higher efficiency than that of low molecular weight surfactants. Compared to traditional surfactants, polymeric surfactants have lower critical micelle concentrations and lower diffusion coefficients. In this paper, we present a well defined copolymer based on lauryl methacrylate and poly(ethylene glycol) methyl ether methacrylate, prepared by solution radical copolymerization. The product was characterized by NMR and FTIR spectroscopies and the weight-average molecular weight and polydispersity index were analyzed by SEC. The thermal transitions and decomposition temperatures of the copolymers were determined by DSC and TGA, respectively. Due to the hydrophobic and hydrophilic nature of the monomer units, emulsification studies were performed. DLS experiments showed different sizes of the formed micelles depending on solvent polarity due to polymer-polymer or polymer-solvent interactions. Rheological characterization was undertaken to study the viscoelastic properties of the dispersed systems. Finally, two types of experiments to evaluate the polymer abilities as surfactant have been carried out. Firstly, the amphiphilic characteristics of this material allowed the incorporation of small amounts of an organic solvent in water forming only one phase, as well as the incorporation of small amounts of water in the organic solvent forming an emulsified phase. Then, the amphiphilic properties of this macrosurfactant have been fully exploited in order to form highly stable dispersions of carbon nanotubes in water. The authors acknowledge financial support from ANPCyT (PICT 2010-2554, PICT-2013-0905, PICT 2015-0346), Fundación Petruzza, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) (PIP 0370) and the Austrian Institute of Technology GmbH (AIT–CONICET Partner Lab: ‘‘Exploratory Research for Advanced Technologies in Supramolecular Materials Science’’ – Exp. 4947/11, Res. No. 3911, 28-12-2011). A.I. and G.D. gratefully acknowledge CONICET for a doctoral and postdoctoral fellowship, respectively. J.M.G and O.A. are CONICET fellows. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|