Abstract
Cellulose-based superabsorbent was synthesized by bacterial cellulose (BC) grafting acrylic acid (AA) in the presence of N,N′-methylenebisacrylamide (NMBA) as a crosslinker and ammonium persulfate (APS) as an initiator. The influence of different factors on composite synthesis, including the weight ratio of the monomer to BC, initiator content, crosslinker content, AA neutralization degree, reaction temperature, and reaction time on the water absorbency of the composite, were systematically learned. Under the optimized conditions, the maximum water absorbency of the composite was 322 ± 23 g/g distilled water. However, the water absorbency was much less for the different salt solutions and the absorption capacity of the composite decreased as the concentration of the salt solutions increased. The pH value had a significant influence on water absorption performance, and with the increase of temperature, the water retention rate of the composite decreased. Additionally, the structure of this composite was characterized with nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results of NMR and FT-IR provided evidence that the composite was synthesized by BC and AA, and the microstructure showed that it had good performance for water absorption. In addition, the composite possessed suitable thermal stability, and that it could be used in a few high-temperature environments. Overall, this composite is promising for application in water absorption.
Highlights
Synthesis of superabsorbent composite is a hot topic in the field of materials [1,2,3]
The yield of bacterial cellulose (BC) varies according to the different carbon sources and production conditions, its availability is somehow comparable to plant cellulose because of its simple and easy production requirements. Since it has excellent structural and biochemical properties, such as an ultra-fine highly-pure nanofibril network structure, high tensile strength, adaptability to the living body, biodegradability, chemical stability, and non-toxicity, especially because of its special network structure, it has a strong capability of water absorption and binding, and it has a wide range of applications, including food, biomedical material, papermaking, and transducer diaphragms [19,20,21,22,23,24,25,26,27]
The network structure the superabsorbent composite is to its absorbency, The network networkstructure structureofof ofthe thesuperabsorbent superabsorbent composite is important important to water its water water absorbency, The composite is important to its absorbency, and and a large number of studies paid attention to the detection of the network structure of and a large number of studies paid attention to the detection of the network structure of a large number of studies paid attention to the detection of the network structure of superabsorbent superabsorbent composites spectroscopy has been widely used to superabsorbent composites been widely used to composites
Summary
Synthesis of superabsorbent composite is a hot topic in the field of materials [1,2,3]. The yield of BC varies according to the different carbon sources and production conditions, its availability is somehow comparable to plant cellulose because of its simple and easy production requirements Since it has excellent structural and biochemical properties, such as an ultra-fine highly-pure nanofibril network structure (its crystallinity is up to 95%, while plant cellulose’s crystallinity is only 65%), high tensile strength (in general, the strength of bacterial cellulose is more than ten times higher than that of plant cellulose), adaptability to the living body, biodegradability, chemical stability, and non-toxicity, especially because of its special network structure, it has a strong capability of water absorption and binding, and it has a wide range of applications, including food, biomedical material, papermaking, and transducer diaphragms [19,20,21,22,23,24,25,26,27]. Water retention at various temperatures were analyzed, respectively
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