The effect of the molecular structure of hydroxypropyl methylcellulose on the states of water, wettability, and swelling properties of cryogels prepared with and without CaO2

Chiaregato, Camila Gruber; Bernardinelli, Oigres Daniel; Shavandi, Amin; Sabadini, Edvaldo; Petri, Denise Freitas Siqueira

doi:10.1016/j.carbpol.2023.121029

Cited by 4 publications

(5 citation statements)

References 41 publications

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“…have been modified to obtain oil/water repellent materials. [41][42][43][44] The wetting modulation may require harsh chemicals during tedious synthesis process. To overcome such issues and the possibility to have biocompatible membrane systems, we have designed a mem-brane based on β-CD, acrylic acid and acrylamide.…”

Section: Resultsmentioning

confidence: 99%

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Reusable Underwater Superoleophobic Polyacrylamide Membranes for Effective Oil‐Water Separation and Dye Removal

Padhan,

Singh

2024

ChemistrySelect

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Water contamination by oily wastes continues to rise with industrialization and pose a threat to marine ecosystem and public health. Water repellent special wettability membranes have been fabricated for oil removal. These superhydrophobic membranes have been fabricated utilizing hazardous chemicals such as fluorinated compounds, which again have shown toxicity. In contrast, environmentally friendly separation membranes are required for oily wastewater treatment. In this regard, we fabricated underwater superoleophobic membrane based on β‐cyclodextrin and acrylamide for efficient and effective water‐oil separation. Acrylamide polymeric membrane was prepared by free radical co‐polymerisation by incorporating acrylic acid and β‐cyclodextrin as monomer via crosslinking with N,N‐methylene bis‐acrylamide. FT‐IR and PXRD used for characterizing the prepared hydrogel and studied for morphological analysis by FE‐SEM. The oil and water wetting characterization of gels were evaluated, in ambient and submerged conditions. The dried gel showed gradual decrease of contact angle for both oil and water indicating liquid absorption with time. However, in completely water wetted state hydrogel was superoleophobic with a very high oil contact angle of ≥170°. The pre‐wetted hydrogel efficiently and effectively separated oil/water mixtures with ~99 % separation efficiency. Additionally, its effectiveness was monitored over several days of continuous separation operation. Interestingly, the hydrogel was also able to remove dye from water. The underwater superoleophobic acrylamide‐β‐cyclodextrin hydrogel demonstrated high oil recovery efficiency and indicated the potential for repeated oil‐water separation process.

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Section: Resultsmentioning

confidence: 99%

“…Various kinds of substrates such as polymeric mesh, steel or metallic meshes, membranes, sponges, etc. have been modified to obtain oil/water repellent materials [41–44] . The wetting modulation may require harsh chemicals during tedious synthesis process.…”

Section: Resultsmentioning

confidence: 99%

Reusable Underwater Superoleophobic Polyacrylamide Membranes for Effective Oil‐Water Separation and Dye Removal

Padhan,

Singh

2024

ChemistrySelect

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“…The hydrophilic groups of HPMC, including hydroxyl and hydroxypropyl [ 25 ], along with amino groups of chitosan, form hydrogen bonds with water molecules, facilitating their orderly arrangement within the HPMC/CS network. The uniformly dispersed calcium ions in solution and the amino groups of protonated chitosan, interact ionically with polyanionic STPP, forming a structured network ( Figure 2 A).…”

Section: Resultsmentioning

confidence: 99%

“…Cellulose, the most abundant natural polymer compound in the world, serves as the foundation for hydroxypropyl methylcellulose (HPMC), a derivative synthesized via etherification of cellulose [ 22 , 23 , 24 ]. HPMC incorporates hydrophilic and hydrophobic groups such as hydroxypropyl and methoxy, endowing it with unique hydration–dehydration properties and temperature sensitivity [ 25 ]. Its high CST and good water retention make it an ideal candidate for fire extinguishing materials [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Chitosan/Hydroxypropyl Methylcellulose Temperature-Sensitive Hydrogel Containing Inorganic Salts for Forest Fire Suppression

Gao,

Zhao,

Wang

2024

Gels

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Effective forest fire suppression remains a critical challenge, necessitating innovative solutions. Temperature-sensitive hydrogels represent a promising avenue in this endeavor. Traditional firefighting methods often struggle to address forest fires efficiently while mitigating ecological harm and optimizing resource utilization. In this study, a novel intelligent temperature-sensitive hydrogel was prepared specially for forest fire extinguishment. Utilizing a one-pot synthesis approach, this material demonstrates exceptional fluidity at ambient temperatures, facilitating convenient application and transport. Upon exposure to elevated temperatures, it undergoes a phase transition to form a solid, barrier-like structure essential for containing forest fires. The incorporation of environmentally friendly phosphorus salts into the chitosan/hydroxypropyl methylcellulose gel system enhances the formation of temperature-sensitive hydrogels, thereby enhancing their structural integrity and firefighting efficacy. Morphological and thermal stability analyses elucidate the outstanding performance, with the hydrogel forming a dense carbonized layer that acts as a robust barrier against the spread of forest fires. Additionally, comprehensive evaluations employing rheological tests, cone calorimeter tests, a swelling test, and infrared thermography reveal the multifaceted roles of temperature-sensitive hydrogels in forest fire prevention and suppression strategies.

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“…Adding HPMC concentration resulted in higher moisture content, whereas the nanochitosan lowered the moisture content. The trend difference between HPMC and nanochitosan film is probably related to the existence of hydrophilic groups in HPMC accounted by hydroxyl groups (Chiaregato et al, 2023). Hydrophilic groups exhibit affinity to water, increasing HPMCs' moisture content with the addition of the concentration.…”

Section: Solutions Characteristicsmentioning

confidence: 99%

Characterization of Layer-by-Layer Biodegradable Films Based on Hydroxypropyl Methylcellulose-Nanochitosan

Muna,

Wicaksono,

Wibowo

2023

J. Appl. Food Tech.

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This research investigates the physical and optical properties of single-layer and layer-by-layer biodegradable films composed of hydroxypropyl methylcellulose (HPMC) and nanochitosan. Initially, HPMC and nanochitosan were formulated as single layers at various concentrations, and subsequently, the selected formulas were utilized to produce a layer-by-layer film. The results indicate that the concentrations of 0.4% w/v HPMC and 0.5% w/v of nanochitosan were successfully assembled into a layer-by-layer biodegradable film. Assessment based on multiple parameters (thickness, moisture content, water vapor transmission rate, color, transparency, and biodegradability) reveals that the deposition of nanochitosan onto HPMC in a layer-by-layer configuration enhances most characteristics of single-layer HPMC films, with the exception of optical properties. Moreover, all samples were degraded within a seven-day observation period.

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The effect of the molecular structure of hydroxypropyl methylcellulose on the states of water, wettability, and swelling properties of cryogels prepared with and without CaO2

Cited by 4 publications

References 41 publications

Reusable Underwater Superoleophobic Polyacrylamide Membranes for Effective Oil‐Water Separation and Dye Removal

Reusable Underwater Superoleophobic Polyacrylamide Membranes for Effective Oil‐Water Separation and Dye Removal

Preparation and Characterization of Chitosan/Hydroxypropyl Methylcellulose Temperature-Sensitive Hydrogel Containing Inorganic Salts for Forest Fire Suppression

Characterization of Layer-by-Layer Biodegradable Films Based on Hydroxypropyl Methylcellulose-Nanochitosan

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