An insight into the gas-phase inhibition mechanism of polymers by addition of triphenyl phosphate flame retardant

2020 ◽  
Author(s):  
S. A. Trubachev ◽  
O. P. Korobeinichev ◽  
S. A. Kostritsa ◽  
V. D. Kobtsev ◽  
A. A. Paletsky ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Gas Phase ◽  
Inhibition Mechanism ◽  
Triphenyl Phosphate ◽  
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Theoretical insight into the substituent effects on the antioxidant properties of 8-hydroxyquinoline derivatives in gas phase and in polar solvents

2018 ◽  
Vol 96 (5) ◽  
pp. 453-458
Author(s):  
Anes El-Hadj Saïd ◽  
Sidi Mohamed Mekelleche ◽  
Taki-Eddine Ahmed Ardjani
Keyword(s):  
Electron Transfer ◽  
Gas Phase ◽  
Antioxidant Properties ◽  
Substituent Effects ◽  
Hydrogen Atom Transfer ◽  
Polar Solvents ◽  
Antioxidant Power ◽  
Theoretical Insight ◽  
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The objective of this work is to perform a theoretical analysis of the antioxidant properties of a series of 8-hydroxyquinolines (8-HQs) to rationalize the available experimental results and to design new potent 8-HQ derivatives. The study was carried out in gas phase and in methanol at the DFT/B3LYP/ 6-311++G(d,p) computational level. The formation of stable ArO• radicals is discussed on the basis of different mechanisms, namely, hydrogen atom transfer (HAT), single electron transfer followed by proton transfer (SET-PT), and single proton loss electron transfer (SPLET). The obtained results show that the HAT mechanism is, thermodynamically, more favoured in gas phase, whereas the SPLET pathway is more favoured in polar solvents. The calculated thermochemical descriptors allow classification of the antioxidant power of the studied compounds.

Facile preparation of uniform polydopamine particles and its application as an environmentally friendly flame retardant for biodegradable polylactic acid

2020 ◽  
Vol 38 (6) ◽  
pp. 485-503
Author(s):  
Benjamin Tawiah ◽  
Bin Yu ◽  
Anthony Chun Yin Yuen ◽  
Bin Fei
Keyword(s):  
Flame Retardant ◽  
Polylactic Acid ◽  
Flame Retardants ◽  
Environmentally Friendly ◽  
Environmentally Benign ◽  
Commercial Application ◽  
Limiting Oxygen Index ◽  
Gaseous Products ◽  
Peak Heat Release Rate ◽  
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The demand for environmentally benign flame retardants for biodegradable polymers has become particularly necessary due to their inherently “green” nature. This work reports intrinsically non-toxic polydopamine (PDA) particles as an efficient and environmentally friendly flame retardant for polylactic acid (PLA). 5 wt% PDA loading resulted in a 22% reduction in the peak heat release rate, 34.7% increase in the fire performance index, and lower CO2 production compared to neat PLA. A limiting oxygen index (LOI) value of 27.5% and a V-2 rating was achieved in the UL-94 vertical burning test. Highly aggregated amorphous particulate char was formed with the increasing content of PDA, and a significant reduction in evolved pyrolysis gaseous products was achieved for the PLA/PDA composites as compared with control PLA. This work provides important insight into the potential commercial application of PDA alone as an efficiently green, environmentally benign flame retardant for bioplastic PLA.

scholarly journals New Insight into the Catalytic and Inhibition Mechanism of the Human Acyl Protein Thioesterase

2016 ◽  
Vol 110 (3) ◽  
pp. 547a-548a
Author(s):  
Martina Audagnotto ◽  
Sylvia Ho ◽  
Patrick Sandoz ◽  
Nicole Andenmatten ◽  
Gisou van der Goot ◽  
...  
Keyword(s):  
Inhibition Mechanism ◽  
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