scholarly journals Tropospheric chemical degradation of vinyl and allyl acetate initiated by Cl atoms under high and low NOx conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48154-48163 ◽  
Author(s):  
María B. Blanco ◽  
Iustinian Bejan ◽  
Ian Barnes ◽  
Peter Wiesen ◽  
Mariano A. Teruel
Keyword(s):  
Vinyl Acetate ◽  
Chemical Degradation ◽  
Allyl Acetate ◽  
Cl Atoms

The products of the reactions of Cl atoms with vinyl acetate (VA) and allyl acetate (AA) have been investigated with and without NOx in a 1080 L chamber using in situ FTIR.

Juvenile and Mature Pinewoods Treated by in situ Polymerization with Poly(vinyl acetate)

2021 ◽  
Author(s):  
Andrey Acosta ◽  
Ezequiel Gallio ◽  
Paula Zanatta ◽  
Henrique Schulz ◽  
Rafael de Avila Delucis ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
In Situ Polymerization

scholarly journals In-Situ Synthesis of TiO2@GO Nanosheets for Polymers Degradation in a Natural Environment

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2158
Author(s):  
Yueqin Shi ◽  
Zhanyang Yu ◽  
Zhengjun Li ◽  
Xiaodong Zhao ◽  
Yongjun Yuan
Keyword(s):  
Natural Environment ◽  
New Technologies ◽  
Separation Efficiency ◽  
Basic Mechanism ◽  
Chemical Degradation ◽  
Natural Environments ◽  
Additional Energy ◽  
Photogenerated Electrons ◽  
Main Components

Plastic photodegradation naturally takes 300–500 years, and their chemical degradation typically needs additional energy or causes secondary pollution. The main components of global plastic are polymers. Hence, new technologies are urgently required for the effective decomposition of the polymers in natural environments, which lays the foundation for this study on future plastic degradation. This study synthesizes the in-situ growth of TiO2 at graphene oxide (GO) matrix to form the TiO2@GO photocatalyst, and studies its application in conjugated polymers’ photodegradation. The photodegradation process could be probed by UV-vis absorption originating from the conjugated backbone of polymers. We have found that the complete decomposition of various polymers in a natural environment by employing the photocatalyst TiO2@GO within 12 days. It is obvious that the TiO2@GO shows a higher photocatalyst activity than the TiO2, due to the higher crystallinity morphology and smaller size of TiO2, and the faster transmission of photogenerated electrons from TiO2 to GO. The stronger fluorescence (FL) intensity of TiO2@GO compared to TiO2 at the terephthalic acid aqueous solution indicates that more hydroxyl radicals (•OH) are produced for TiO2@GO. This further confirms that the GO could effectively decrease the generation of recombination centers, enhance the separation efficiency of photoinduced electrons and holes, and increase the photocatalytic activity of TiO2@GO. This work establishes the underlying basic mechanism of polymers photodegradation, which might open new avenues for simultaneously addressing the white pollution crisis in a natural environment.

scholarly journals Sources and sinks of acetone, methanol, and acetaldehyde in North Atlantic marine air

2005 ◽  
Vol 5 (7) ◽  
pp. 1963-1974 ◽  
Author(s):  
A. C. Lewis ◽  
J. R. Hopkins ◽  
L. J. Carpenter ◽  
J. Stanton ◽  
K. A. Read ◽  
...  
Keyword(s):  
North Atlantic ◽  
Degradation Mechanism ◽  
Chemical Degradation ◽  
Oh Radical ◽  
Detailed Model ◽  
Atmospheric Lifetime ◽  
Sources And Sinks ◽  
Marine Air ◽  
Made In

Abstract. Measurements of acetone, methanol, acetaldehyde and a range of non-methane hydrocarbons have been made in North Atlantic marine air at the Mace Head observatory. Under maritime conditions the combination of OVOCs (acetone, methanol and acetaldehyde) contributed up to 85% of the total mass of measured non methane organics in air and up to 80% of the OH radical organic sink, when compared with the sum of all other organic compounds including non-methane hydrocarbons, DMS and OH-reactive halocarbons (trichloromethane and tetrachloroethylene). The observations showed anomalies in the variance and abundance of acetaldehyde and acetone over that expected for species with a remote terrestrial emission source and OH controlled chemical lifetime. A detailed model incorporating an explicit chemical degradation mechanism indicated in situ formation during air mass transport was on timescales longer than the atmospheric lifetime of precursor hydrocarbons or primary emission. The period over which this process was significant was similar to that of airmass motion on intercontinental scales, and formation via this route may reproduce that of a widespread diffuse source. The model indicates that continued short chain OVOC formation occurs many days from the point of emission, via longer lived intermediates of oxidation such as organic peroxides and long chain alcohols.

Effect of Organo-Shell Materials on Compatibility of the Hydrotalcite Flame Retardant in Ethylene Vinyl Acetate

2019 ◽  
Vol 19 (11) ◽  
pp. 7476-7486
Author(s):  
Jinze Du ◽  
Hongyan Zeng ◽  
Enguo Zhou ◽  
Bo Feng ◽  
Chaorong Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Tensile Strength ◽  
Vinyl Acetate ◽  
Md Simulation ◽  
Ethylene Vinyl Acetate ◽  
Flame Retardance ◽  
Strength Tests ◽  
Intrinsic Correlation

The microcapsule nanoparticles were prepared by in-situ copolymerization of hydrotalcites (MAH) with the polymer (MF, PF, PS and PU) monomers, respectively, where the MF-wrapped MAH (MAH@MF) had the best monodispersity. The composites of the microcapsules and EVA were prepared by incorporating the microcapsule nanoparticles into ethylene vinyl acetate (EVA), respectively. To further understand the intrinsic correlation between microcapsule fillers and EVA matrix, molecular dynamics (MD) simulation was introduced to qualitatively analyze the contribution of microcapsule fillers on improving compatibility and mechanical properties of the EVA matrix. The compatibility of microcapsule nanoparticles with EVA matrix were detected in sequence through SEM, DSC and tensile strength tests. And the combustion, thermal behavior and flame retardance were also characterized by TG analyses as well as LOI and UL-94 level. As a result, the MAH@MF filler had the best performances in improving the flame retardancy and mechanical properties among the microcapsule fillers, attributed to high compatibility of the MAH@MF and EVA matrix, which made uniform distribution of the MAH@MF filler due to the reciprocity of triazine functional ring with vinyl acetate linkages.

Hydroformylation of unsaturated esters and 2,3-dihydrofuran under solventless conditions at room temperature catalysed by rhodium N-pyrrolyl phosphine catalysts

2019 ◽  
Vol 43 (43) ◽  
pp. 16990-16999 ◽  
Author(s):  
W. Alsalahi ◽  
A. M. Trzeciak
Keyword(s):  
Vinyl Acetate ◽  
Methyl Acrylate ◽  
Butyl Acrylate ◽  
Room Temperature ◽  
Allyl Acetate ◽  
Unsaturated Esters

Complexes of the type HRh(CO)L3 (where L is an N-pyrrolyl phosphine, e.g. P(NC4H4)3, Ph(NC4H4)2, or PPh2(NC4H4)) were applied in the hydroformylation of less reactive unsaturated substrates (allyl acetate, butyl acrylate, methyl acrylate, 2,3-dihydrofuran, vinyl acetate).

Nanoinfusion of ZnO and ZnS nanoparticles into ethylene vinyl acetate in situ for improved optical properties

2013 ◽  
Vol 34 (3) ◽  
pp. 354-358 ◽  
Author(s):  
Matthew J. Bachus ◽  
Wolfgang U. Spendel ◽  
William H. Steinecker ◽  
Stanley G. Prybyla ◽  
Gilbert E. Pacey
Keyword(s):  
Optical Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Zns Nanoparticles

Study on Synthesis of In Situ Composite of Nano-SiO2 and Vinyl Acetate-Acrylate Emulsion

2014 ◽  
Vol 584-586 ◽  
pp. 1695-1699
Author(s):  
Xiao Hui Wang ◽  
Li Min Dong ◽  
Ren Li Wang ◽  
Han Fei Lu
Keyword(s):  
Vinyl Acetate ◽  
Silane Coupling Agent ◽  
Theoretical Research ◽  
Latex Film ◽  
Polymerization Reaction ◽  
Test Results ◽  
Acetate Methyl ◽  
Silane Coupling ◽  
Acrylate Emulsion

Commercially available nanosilica was modified with silane coupling agent A-151, and then emulsion was synthesized with modified SiO2, vinyl acetate, methyl methacrylate and butyl acrylate by polymerization reaction. Effects the amount of emulsifier, initiator and organic nano-SiO2, etc factors on the performance of emulsion polymerization and latex film were investigated. The best test results of composite emulsion of SiO2and vinyl acetate-acrylate were obtained by theoretical research and experimental operation: modified nano-SiO2content of 3%, emulsifier the content of OP of 3%, potassium persulfate content of the initiator of 0.5%. By infrared spectroscopy, surface of the SiO2had been changed, which showed the performance of situ composite of modified nano-SiO2 and vinyl acetate-acrylate emulsion had been significantly improved.

ChemInform Abstract: Hydroacetoxylation of Olefins with Acetic Acid Generated in situ from Vinyl Acetate in the Presence of Ruthenium Complexes.

ChemInform ◽  
2011 ◽  
Vol 42 (30) ◽  
pp. no-no
Author(s):  
R. I. Khusnutdinov ◽  
N. A. Shchadneva ◽  
L. F. Khisamova ◽  
U. M. Dzhemilev
Keyword(s):  
Acetic Acid ◽  
Vinyl Acetate ◽  
Ruthenium Complexes
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