Structure, surface tension, and rheological behaviors of hydrophobically associative polyacrylamides by self‐emulsified microemulsion polymerization

Abstract

Hydrophobically associating copolymers using acrylamide (AM), acrylic acid (AA), and Styrene (St) as comonomers were successfully prepared by self‐emulsified microemulsion polymerization, in which low‐molecular‐weight AM/AA/St copolymers as surfactant and AM as cosurfactant. The structure and chemical composition of AM/AA/St copolymers were characterized by Fourier transform infrared, nuclear magnetic (NMR), and differential scanning calorimeter. The content of PSt in the copolymers is determined by 1H nuclear magnetic resonance spectra, suggesting that the self‐made polymer surfactant can disperse uniformly the St monomers to improve the copolymerization efficiency. Furthermore, the polymerization mechanism of the self‐emulsified microemulsion method is explored preliminarily. During the synthesis of the copolymers, the purified copolymer solution is obtained in one step without using a small molecular emulsifier such as sodium dodecyl sulfate, in order to avoid the complicated post‐treatment process of the small molecular emulsifier. The copolymers revealed good hydrophobic association properties and low surface tension.

Optimization Preparation of Indium Tin Oxide Nanoparticles via Microemulsion Method Using Orthogonal Experiment

“…Compared with the above methods, the microemulsion method, with a simple and safe process, could control the morphology and size of the nanoparticles. It has been used in the preparation of metal nanocrystals, metal oxides and polymers, such as highefficiency CsPbBr 3 /CsPb 2 Br 5 composite [20], nanostructured CaO/CuO composites [21], hydrophobically associative polyacrylamides [22] and sub-100 nm PEG NPs [23]. However, the microemulsion method has not been applied in the preparation of ITO nanoparticles.…”