Swelling Properties and Environmental Responsiveness of Superabsorbent Composite Based on Starch-G-Poly Acrylic Acid/Organo-Zeolite

Wei

Polymers and Polymer Composites

et al. 2023

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In this work, novel superabsorbent composites made of starch-grafted-polyacrylic acid/coal gangue were prepared via aqueous solution polymerization. The starch-g-polyacrylic acid/coal gangue (St-g-PAA/CG) composite with 10 wt.% CG showed the maximum water absorbency in distilled water (560 g·g−1) and a 0.9 wt.% NaCl solution (102 g·g−1). Moreover, this superabsorbent composite exhibited fine thermal stability and its swelling behavior was dependent on pH. In general, the swelling kinetics of the superabsorbent composites fitted with the Scott’s kinetic model. These composites not only showed excellent water absorption reversibility after five absorption/drying cycles, but also exhibited considerable environmental responsiveness after the swelling medium was changed from distilled water to the 0.9 wt.% NaCl solution. Based on these results, the prepared superabsorbent composites can be applied in several fields such as horticulture, agriculture, health care, and controlled drug delivery, while ensuring comprehensive utilization of solid wastes.

Section: Resultsmentioning

confidence: 99%

Fabrication and swelling properties of a novel superabsorbent composite derived from waste coal gangue

Wei

Polymers and Polymer Composites

et al. 2023

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“…Our previous study focused on optimizing the synthesis of the starch-g-poly(acylic acid)/organo-mordenite(St-g-PAA/ OMOR) superabsorbent composite and the investigating the water absorption and swelling properties of the superabsorbent composite. 20 In this study, the influence of the organification degree of organo-mordenite (OMOR) on the swelling behavior of the St-g-PAA/OMOR superabsorbent composite was investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of organification degree of mordenite on swelling behaviors of starch-g-poly (acrylic acid) /organo-mordenite superabsorbent composites

Polymers and Polymer Composites

Wei

Wang

et al. 2022

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Starch-g-poly(acrylic acid)/organo-mordenite (St-g-PAA/OMOR) superabsorbent composites were prepared via inverse suspension polymerizationutilizing potassium persulfate as an initiator and N, N’-methylene bisacrylamide as a crosslinker. Different dosages of cetyltrimethylammonium bromide were used to obtain organo-mordenite (OMOR) samples with different organification degrees. The effects of the organification degree of OMOR on the water absorbency, swelling behavior, and reswelling properties of St-g-PAA/OMOR were studied. The results from both FTIR and XRD analyses indicate that the Si–OH group of OMOR was involved in the formation of the St-g-PAA/OMOR composite. SEM analyses showed that the organification degree of OMOR influenced the morphology of the St-g-PAA/OMOR composite. The water absorption absorbency, swelling rate, and reswelling capability of the St-g-PAA/OMOR composite prepared using the OMOR with the optimal organification degree were superior to those of the St-g-PAA/mordenite composite. The swelling behaviors of the St-g-PAA/OMOR composites, which were measured in distilled water, obeyed Schott’s second-order kinetics model. The St-g-PAA/OMOR composite prepared using the OMOR with the 8 wt.% organification degree had the highest water absorption capacity and the highest swelling rate. Moreover, after five swelling–shrinking cycles, the composite retained its excellent water absorption capacity.

Journal of Industrial Textiles

“…Hydrogels are physically or chemically cross-linked three-dimensional (3-D) hydrophilic polymer structures which can absorb a significant amount of water and hold it in their structures [1–3]. Hydrogels having very distinct biocompatibility, permeability and hydrophilicity offer potential in various areas such as wound dressings [4], tissue engineering [5,6], drug delivery systems [7,8], healthcare and hygienic products [9] and agriculture applications [10].…”

Section: Introductionmentioning

confidence: 99%

Natural fibers woven fabric reinforced hydrogel composites for enhanced mechanical properties

Koc

Aykut

Eren

2020

One-step and rapid preparation of natural fiber woven fabric reinforced hydrogel composites via simultaneous dissolution and crosslinking of polyvinyl alcohol (PVA) yarns in the fabric was reported. In this regards, PVA/Cotton (C), PVA/Flax (F) and PVA/Wool (W) blended woven fabrics were prepared for the manufacturing fabric reinforced hydrogel composites. The hybrid woven fabric reinforced fabrics were treated with different concentrations of borax solutions. Aqueous borax solutions were used to alter the PVA yarns in the fabric into cross-linked structure in order to enhance mechanical performance of the hydrogel composite. Morphological investigation of hydrogel composites in a dried form was carried out by scanning electron microscopy (SEM) imaging. The chemical characterization of aqueous borax treated samples was examined by fourier-transform infrared spectroscopy (FTIR) measurements. Mechanical performances of the hydrogel composites were observed by tensile measurements. Thermogravimetric analysis (TGA) was conducted to characterize thermal stability of hydrogel composites. The results revealed that natural fiber woven fabric reinforcement significantly enhanced the mechanical strength of hydrogel composites, and wool fabric reinforced composite had better mechanical performance than its cotton and flax counterparts. Due to the low mechanical properties of hydrogels in general, the prepared fabric reinforced hydrogel composites could be used in hydrogel applications where mechanical strength is critically important.