Synthesis of Hydrogel Nanocomposites Based on Partially Hydrolyzed Polyacrylamide, Polyethyleneimine, and Modified Clay

Autor:	Priscila F. Oliveira, Kelly Lúcia Nazareth Pinho de Aguiar, Beatriz M. Vicente, Kaique A. B. Pereira, Lucas G. Pedroni, Claudia R. E. Mansur
Rok vydání:	2019
Předmět:	Chemistry General Chemical Engineering education Polyacrylamide technology industry and agriculture macromolecular substances General Chemistry Hydrogel nanocomposites humanities Article Hydrolysis chemistry.chemical_compound Chemical engineering Self-healing hydrogels QD1-999 Water in oil
Zdroj:	ACS Omega ACS Omega, Vol 5, Iss 10, Pp 4759-4769 (2020)
ISSN:	2470-1343
Popis:	Polymeric gels have been an important category for material scientists due its versatile structural features. Hence, hydrogels are being used to reduce excess production water in oil reservoirs. In this work, cross-linked partially hydrolyzed polyacrylamide (HPAM) composite hydrogels impregnated with bentonite clay (Bent) and bentonite clay modified (Orgbentent) with the surfactant hexadecyltrimethylammonium bromide were synthesized and characterized as a sealing agent in high water producing permeable zones in the petroleum industry. The concept of utilizing hydrophobically modified clay as an inorganic additive in the hydrogel matrix emanates from the fact that this additive exhibit greater interaction with the polymer chains. These interactions can promote the inherent properties of the hydrogel. Polyethyleneimine (PEI) was chosen as the cross-linking agent. HPAM/PEI conventional hydrogels and HPAM/PEI/Bent and HPAM/PEI/Orgbent at 100 mg·L–1 clay were synthesized. The developed hydrogels were characterized by a hybrid rheometer and Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) instruments. Rheological results reveal that the (HPAM/PEI/Bent-3 and HPAM/PEI/Orgbent-3) composite hydrogels showed higher elastic modulus (G′) and durability in the studied conditions (stable at 30 days) than conventional ones (HPAM/PEI), indicating the dispersion and reinforcing effect of clay. The functional groups of these hydrogels were confirmed by FTIR, and TGA demonstrated the structural reinforcement due to the presence of the clays, which had lower weight loss than the conventional hydrogel. The hydrogel morphologies were analyzed by SEM, and the results corroborated with those obtained by TGA, indicating better structural reinforcement when using organophilic clay.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f148639dfc31dfa370f30fd1d4bae2d https://pubmed.ncbi.nlm.nih.gov/32201761 Zobrazit plný text záznamu