Physico-Chemical and Technological Regularities of Foam Polystyrene Degazation in the Liquid Medium

Moravskyi, Volodymyr; Levytskyi, Volodymyr; Bratychak, Mуkhailo; Khromyak, Ulyana; Kuznetsova, M.Ya.; Chopyk, Nataliia

doi:10.23939/chcht13.03.347

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The same conditions are usually in landfills, where the polymeric products are stored after utilization. Therefore, the data concerning the sorption properties of material [12] and water diffusion [13] are needed to predict the behavior of mentioned materials in the humid mediums as well as to assess their working ability and the water impact on polymer degradation.…”

Section: Resultsmentioning

confidence: 99%

Green Polymerization of Vinyl Acetate Using Maghnite-Na+, an Exchanged Montmorillonite Clay, as an Ecologic Catalyst

Cherifi¹,

Belbachir²,

Bennabi³

2021

ChChT

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In this work, the green polymerization of vinyl acetate is carried out by a new method which consists in the use of clay called Maghnite-Na+ as an ecological catalyst, non-toxic, inexpensive and recyclable by a simple filtration. X-ray diffraction and scanning electron microscopy showed that Maghnite-Na+ is successfully obtained after cationic treatment (sodium) on crude maghnite. It is an effective alternative to replace toxic catalysts such as benzoyl peroxide and azobisisobutyronitrile which are mostly used during the synthesis of polyvinyl acetate (PVAc) making the polymerization reaction less problematic for the environment. The synthesis reaction is less energetic by the use of recycled polyurethane as a container for the reaction mixture and is considered as a renewable material and a good thermal insulator maintaining the temperature of 273 K for 6 h. The reaction in bulk is also preferred to avoid the use of a solvent and therefore to stay in the context of green chemistry. In these conditions, the structure of obtained polymer is established by 1H NMR and 13C NMR. Infrared spectroscopy (FT-IR) was also used to confirm the structure of PVAc. Thermogravimetric analysis showed that it is thermally stable and starts to degrade at 603 K while differential scanning calorimetry showed that this polymer has a glass transition temperature Tg of 323 K.

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Section: Resultsmentioning

confidence: 99%

Green Polymerization of Vinyl Acetate Using Maghnite-Na+, an Exchanged Montmorillonite Clay, as an Ecologic Catalyst

Cherifi¹,

Belbachir²,

Bennabi³

2021

ChChT

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Resistance of Polylactide Materials to Water Mediums of the Various Natures

Levytskyi¹,

Katruk²,

Masyuk³

et al. 2021

ChChT

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The influence of talc filler, its content, as well as an additional heat treatment and temperature on the regularities of polylactide materials water-absorption has been researched. Based on the obtained data, the water diffusion coefficient in polylactide materials and the activation energy of the diffusion process were determined. It was found that the process of water absorption by the filled and heat-treated materials based on polylactide proceeds slower and requires more activation energy of the process. Stability of the developed polylactide materials to acidic and alkaline media has been determined, in particular, it was found that the destruction of polylactide samples occurs faster in an alkaline medium than in an acidic one

show abstract

Physico-Chemical and Technological Regularities of Foam Polystyrene Degazation in the Liquid Medium

Cited by 2 publications

References 12 publications

Green Polymerization of Vinyl Acetate Using Maghnite-Na+, an Exchanged Montmorillonite Clay, as an Ecologic Catalyst

Green Polymerization of Vinyl Acetate Using Maghnite-Na+, an Exchanged Montmorillonite Clay, as an Ecologic Catalyst

Resistance of Polylactide Materials to Water Mediums of the Various Natures

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