Synthesis and characterization of polypropylene glycol‐based novel organogels as effective materials for the recovery of organic solvents

Erdem, Ahmet

doi:10.1002/app.49997

Cited by 4 publications

(1 citation statement)

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“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/ma16083094/s1. References [71][72][73][74][75] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Dual Stimuli-Responsive Orthodontic Aligners: An In Vitro Study

et al. 2023

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Aligner therapy for orthodontic tooth movement is gaining importance in orthodontics. The aim of this contribution is to introduce a thermo- and water-responsive shape memory polymer (SMP), which could lay the foundation for a new type of aligner therapy. The thermal, thermo-mechanical, and shape memory properties of thermoplastic polyurethane were studied by means of differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and various practical experiments. The glass transition temperature of the SMP relevant for later switching was determined to be 50 °C in the DSC, while the tan δ peak was detected at 60 °C in the DMA. A biological evaluation was carried out using mouse fibroblast cells, which showed that the SMP is not cytotoxic in vitro. On a digitally designed and additively manufactured dental model, four aligners were fabricated from an injection-molded foil using a thermoforming process. The aligners were then heated and placed on a second denture model which had a malocclusion. After cooling, the aligners were in a programmed shape. The movement of a loose, artificial tooth and thus the correction of the malocclusion could be realized by thermal triggering the shape memory effect, at which the aligner corrected a displacement with an arc length of approximately 3.5 mm. The developed maximum force was separately determined to be about 1 N. Moreover, shape recovery of another aligner was realized within 20 h in 37 °C water. In perspective, the present approach can help to reduce the number of orthodontic aligners in therapy and thus avoid excessive material waste.

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“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/ma16083094/s1. References [71][72][73][74][75] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Dual Stimuli-Responsive Orthodontic Aligners: An In Vitro Study

et al. 2023

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Removal of organic solvents from contaminated water surface through a fatty acid grafted polyvinyl alcohol based organogel

Baruah

Ahmed

Dutta

et al. 2022

J of Applied Polymer Sci

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Toxic organic solvents are constantly being cast out causing serious issues to the environment. In this work, a polyvinyl alcohol (PVA)‐based organogel has been prepared by modification with a long‐chain fatty acid via condensation method without the use of any cross‐linker. Organogel or the semi‐solid material has been used as a sorbent for solvent absorption from the polluted water surface. The prepared organogel was characterized by Fourier Transform‐Infrared Spectroscopy, Nuclear Magnetic Resonance, Wide‐Angle X‐Ray diffraction, scanning electron microscope, Thermogravimetric Analysis while contact angle measurements were also performed. The gel was used as a sorbent for the absorption of organic solvents. The swelling ratio was examined and exhibited absorption performance of 534% with reusable and retention properties. Experiments were performed to find the maximum absorption capacity at 875.5 (g/g), establishing kinetics of second order reaction. The gel can be extracted by scooping after absorption. Thus, making it an effective and ideal material for the removal of a wide array of organic solvents.

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