Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation / Manisha V. Bagal in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 30-41 Titre : Effect of additives on degradation of poly vinyl alcohol (PVA) using ultrasound and microwave irradiation Type de document : texte imprimé Auteurs : Manisha V. Bagal, Auteur ; Rahul R. Saini, Auteur ; Abdul Rahim I. Shaikh, Auteur ; Saurabh Patil, Auteur ; Ashish V. Mohod, Auteur ; Dipak V. Pinjari, Auteur Année de publication : 2023 Article en page(s) : p. 30-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool polyvinylique Dioxyde de titane Matières plastiques -- Additifs Micro-ondes Oxyde de zinc Polymères -- Détérioration Surfactants Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : The degradation of polyvinyl alcohol (PVA) has been investigated using ultrasonic (US) as well as microwave (MW) irradiation techniques with the approach of process intensification based on different additives, such as Titanium Dioxide (TiO2), Sodium Lauryl Sulphate (SLS), Zinc Oxide (ZnO) and air. The effects of sonication time, initial polymer concentration, and temperature on the extent of reduction in viscosity have been thoroughly investigated using US as well as MW irradiation approaches. Basically, the degradation process has been optimized by utilizing two different ultrasonic reactors in a combined approach of ultrasonic horn and bath. The maximum extent of degradation of PVA was found to be 69.33% using MW irradiation with a required energy of 0.321 g/JL, and 62.47% using US horn with a required energy of 0.054 g/JL when operated at 0.1 g/L of TiO2 catalyst. The combination of US horn and US bath results in same degradation as 0.1 g/L of TiO2 catalyst with US horn. It has also been observed that the maximum degradation of PVA was obtained with a minimum treatment time of 3 min using MW irradiation, whereas the US horn required 40 min. Moreover, a lower extent of PVA degradation was obtained when additives were used, such as surfactants (SLS) and air. As a result, it can be inferred that the MW-assisted approach in the presence of process-intensifying additives/catalysts is the best approach for the degradation of PVA with a minimum energy consumption. Note de contenu : - MATERIALS AND METHODS : Materials - Ultrasonic and microwave irradiation reactor - Experimental methodology - RESULTS AND DISCUSSION : Effect of operating power of microwave - The effect of the operating power of the microwave ovens on the extent - Effect of temperature - Effect of initial concentration - Effect of catalyst TiO2 loading - Effect of ZnO catalyst loading - Effect of surfactant loading on intrinsic viscosity - Effect of air sparging - Effect of the combination of ultrasonic horn and ultrasonic bath - Comparison of US and MW degradation - Table 1 : Detailed data of efflux time, relative viscosity, specific viscosity, intrinsic viscosity and extent of degradation using ultrasound and MW-assisted approach (initial PVA) concentration of 0.5% (w/v), temperature 30 °C, efflux time for water (t) 9.48 s, volume 200 mL, MW power 300 W) - Table 2 : Comparison of results obtained at optimized operating parameters (initial PVA) concentration of 0.5% (w/v), temperature 30 °C, volume 200 mL, MW power 300 W using ultrasound and MW-assisted approach DOI : https://doi.org/10.1515/ipp-2022-4232 En ligne : https://drive.google.com/file/d/1qtOseg66ug6sEjMoF9whC50kG6IGM1Lg/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39192 [article]

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