Poly(vinyl alcohol) gels cross-linked by boric acid for radiation protection of astronauts

Lambertini, Lucia; Coccarelli, Giuseppe; Toto, Elisa; Santonicola, Maria Gabriella; Laurenzi, Susanna

doi:10.1016/j.actaastro.2024.05.020

Cited by 2 publications

References 70 publications

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Research and application of high gas coal seam air leakage control technology based on polymer material cross-linking mechanism

Zhao,

Li,

Zhang

2024

Preprint

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In order to alleviate the problem of corner gas accumulation caused by air leakage in goaf of high gas coal seam. The rapid film-forming sealing material for the corner wall and the grouting sealing material for the corner roof were developed and optimized, and the' plugging-injection' combined air leakage sealing scheme was proposed. The orthogonal experiment was designed with the thickness attenuation ratio of the plugging film at 12h and24 h, gel viscosity, adhesion, setting time and other factors as indicators, and the best material ratio was selected. The engineering test shows that: (1) 1.5% sodium alginate solution and 7.5% calcium chloride solution can be sprayed in turn to quickly form a plugging film and stick to the corner wall; (2) 2.5% polyvinyl alcohol, 0.6% borax and 0.5% thickener were mixed into water and stirred to obtain polymer plugging slurry. (3) According to the monitoring results, the gas concentration of each monitoring point decreased by more than 62% after using the plugging material, and the gas concentration in the upper corner decreased by 67%. The air leakage decreased by more than 50%, and the upper corner decreased by 57%. The air leakage plugging scheme formed by the dynamic combination of the functions of the above two types of optimized new materials can effectively reduce the gas accumulation in the corner caused by air leakage in the goaf and reduce the occurrence of gas overrun accidents in the working face, which has a good utilization prospect.

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Research and application of high gas coal seam air leakage control technology based on polymer material cross-linking mechanism

Zhao,

Li,

Zhang

2024

Preprint

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Recent Advances in Poly(vinyl alcohol)-Based Hydrogels

Bercea

2024

Polymers

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Poly(vinyl alcohol) (PVA) is a versatile synthetic polymer, used for the design of hydrogels, porous membranes and films. Its solubility in water, film- and hydrogel-forming capabilities, non-toxicity, crystallinity and excellent mechanical properties, chemical inertness and stability towards biological fluids, superior oxygen and gas barrier properties, good printability and availability (relatively low production cost) are the main aspects that make PVA suitable for a variety of applications, from biomedical and pharmaceutical uses to sensing devices, packaging materials or wastewater treatment. However, pure PVA materials present low stability in water, limited flexibility and poor biocompatibility and biodegradability, which restrict its use alone in various applications. PVA mixed with other synthetic polymers or biomolecules (polysaccharides, proteins, peptides, amino acids etc.), as well as with inorganic/organic compounds, generates a wide variety of materials in which PVA’s shortcomings are considerably improved, and new functionalities are obtained. Also, PVA’s chemical transformation brings new features and opens the door for new and unexpected uses. The present review is focused on recent advances in PVA-based hydrogels.

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Poly(vinyl alcohol) gels cross-linked by boric acid for radiation protection of astronauts

Cited by 2 publications

References 70 publications

Research and application of high gas coal seam air leakage control technology based on polymer material cross-linking mechanism

Research and application of high gas coal seam air leakage control technology based on polymer material cross-linking mechanism

Recent Advances in Poly(vinyl alcohol)-Based Hydrogels

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