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Bentonite-Acrylamide Hydrogels Prepared by the Nonmixing Method: Characterization and Properties
Shenglai Guo1, Yang Li1, Yu Wang2
1School of Petroleum Engineering, Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Shandong Key Laboratory of Oilfield Chemistry, Qingdao 266580, China.
ACS Omega
|October 25, 2019
Summary
This study introduces a novel method for preparing bentonite-acrylamide hydrogels by extruding a monomer mixture into a bentonite mud cake. Optimized conditions enhance hydrogel tensile strength and ensure uniform elemental composition.
Area of Science:
- Materials Science
- Polymer Chemistry
Background:
- Bentonite-acrylamide hydrogels are widely researched materials.
- Traditional preparation involves uniform mixing of bentonite and monomers.
Purpose of the Study:
- To propose a novel preparation method for bentonite-acrylamide hydrogels.
- To investigate the impact of extrusion parameters on hydrogel properties.
Main Methods:
- Preparation of bentonite-acrylamide hydrogel via mud cake extrusion and water-bath curing.
- Investigating effects of extrusion pressure, time, and acrylamide concentration.
- Elemental analysis using scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDS).
Main Results:
- Tensile strength initially increases with extrusion pressure and time, then stabilizes.
- Tensile strength rises with acrylamide concentration, followed by a slight decrease.
- Carbon and nitrogen content in the mud cake increase with extrusion parameters, indicating monomer incorporation.
Conclusions:
- The novel extrusion method allows for controlled preparation of bentonite-acrylamide hydrogels.
- Extrusion parameters significantly influence hydrogel tensile strength and elemental distribution.
- SEM-EDS confirms uniform elemental composition within the hydrogel along the extrusion direction.
