The Action of Unsaturated Compounds on Natural Rubber in Solution. I. The Reaction Catalyzed by a Peroxide

1952 ◽  
Vol 25 (1) ◽  
pp. 74-88
Author(s):  
André Delalande
Keyword(s):  
Experimental Study ◽  
Natural Rubber ◽  
Thermal Reaction ◽  
Unsaturated Compounds ◽  
Simultaneous Use ◽  
Short Time ◽  
Insight Into

Abstract It has been shown that, by the simultaneous use of maleic N-methylimide and p-bromobenzoyl peroxide, it is possible to gain an insight into the fixation of ethylene compounds to rubber in solution. The investigation has made it clear that the presence of a peroxide is not indispensable, since the reaction continues even after the peroxide is completely decomposed, although at a much slower rate. Furthermore, by raising the temperature, it is possible to fix maleic N-methylimide in a relatively short time. The results of an experimental study of this thermal reaction in the absence of a catalyst are to be published later.

The Action of Unsaturated Compounds on Natural Rubber in Solution. II. The Reaction Induced by Heat Alone

1952 ◽  
Vol 25 (2) ◽  
pp. 275-286
Author(s):  
André Delalande
Keyword(s):  
Free Radicals ◽  
Elevated Temperature ◽  
Natural Rubber ◽  
Addition Reaction ◽  
Thermal Reaction ◽  
Temperature Range ◽  
Unsaturated Compounds ◽  
Mechanism Of The Reaction

Abstract The addition reaction at an elevated temperature (170° C) of maleic N-methylimide with natural rubber in solution was studied. Attempts were made to apply the principles of kinetics to this thermal reaction with a view to understanding the nature of the reaction, but the complexity of the system made impossible any chance of attaining the results hoped for. A comparison of the fixation of acrylonitrile and that of maleic N-methylimide in the temperature range of 160°–200° C showed that the rates of these two reactions are in the ratio of 1 to 25–30. A determination of the unsaturation of the addition products showed that fixation is on the α-methylenic carbon atoms of the rubber hydrocarbon. Finally a mechanism of the reaction is proposed, in which free radicals play a part.

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

Mechanistic insight into the ruthenium-catalysed anti-Markovnikov hydration of alkynes using a self-assembled complex: a crucial role for ligand-assisted proton shuttle processes

2014 ◽  
Vol 43 (29) ◽  
pp. 11277-11285 ◽  
Author(s):  
Bernhard Breit ◽  
Urs Gellrich ◽  
Timothy Li ◽  
Jason M. Lynam ◽  
Lucy M. Milner ◽  
...  
Keyword(s):  
Experimental Study ◽  
Crucial Role ◽  
Ligand Complex ◽  
Mechanistic Insight ◽  
Self Assembled ◽  
Insight Into

A combined computational and experimental study into the mechanism of the anti-Markovnikov hydration of phenylacetylene by a self-assembled ligand complex.

scholarly journals EXPERIMENTAL STUDY ON DEVELOPMENT OF ADOLESCENTS' INTERACTION SKILLS IN SOCIAL PAINTING

2018 ◽  
Vol 3 ◽  
pp. 214
Author(s):  
Evita Barkane ◽  
Zenija Truskovska
Keyword(s):  
Experimental Study ◽  
Social Game ◽  
Insight Into ◽  
Interaction Skills

The paper provides an insight into the experimental study on the development of adolescents' interaction skills in social painting that was carried out at Rezekne Academy of Technologies (Latvia) in 2017. The study is part of a broader research conducted from 2015 to 2017.The effectiveness of social painting as a social game and method in development of adolescents' interaction skills in social-pedagogical teamwork is scientifically justified and experimentally validated in the research.

Ring stacking and laddering in ammonium carboxylate salts: extension to secondary ammonium salts

CrystEngComm ◽  
2020 ◽  
Vol 22 (43) ◽  
pp. 7399-7406
Author(s):  
James A. Odendal ◽  
Jocelyn C. Bruce ◽  
Klaus R. Koch ◽  
Delia A. Haynes
Keyword(s):  
Experimental Study ◽  
Crystal Structures ◽  
Ammonium Salts ◽  
Ionic Model ◽  
Insight Into

A combined CSD and experimental study shows that the ring stacking and laddering principle, an ionic model, gives insight into the crystal structures of secondary ammonium carboxylate salts.

A new insight into catalytic role of copper sulfate on elemental mercury oxidation: DFT and experimental study

Fuel ◽  
2019 ◽  
Vol 252 ◽  
pp. 10-18 ◽  
Author(s):  
Shu Yang ◽  
Kang Liu ◽  
Min Liu ◽  
Xu Yan ◽  
Cao Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Copper Sulfate ◽  
Elemental Mercury ◽  
Mercury Oxidation ◽  
Catalytic Role ◽  
Insight Into

scholarly journals The Acute Effect of the Antioxidant Drug U-74389G on Red Blood Cell Distribution Width Levels During Hypoxia Reoxygenation Injury in Rats

Folia Medica ◽  
2016 ◽  
Vol 57 (3-4) ◽  
pp. 235-242
Author(s):  
Constantinos Tsompos ◽  
Constantinos Panoulis ◽  
Konstantinos Toutouzas ◽  
George Zografos ◽  
Apostolos Papalois
Keyword(s):  
Experimental Study ◽  
Blood Cell ◽  
Red Blood Cell ◽  
Acute Effect ◽  
Cell Distribution ◽  
Distribution Width ◽  
Reoxygenation Injury ◽  
Short Time ◽  
Red Blood Cell Distribution ◽  
Hypoxia Reoxygenation

Abstract The AIM of this experimental study was to evaluate the effect of the antioxidant drug “U-74389G” in a rat model of hypoxia reoxygenation (HR) using the previously established protocol. Effects of treatment were evaluated by mean red blood cell distribution width (RDW) levels. MATERIALS AND METHODS: 40 rats of a mean weight of 231.875 g were employed in the study. RDW levels were determined at 60 min (groups A and C) and at 120 min (groups B and D) after starting the reoxygenation. Groups A and B received no drugs, whereas rats from groups C and D were administered with U-74389G. RESULTS: demonstrated that U-74389G administration significantly decreased the RDW levels by 4.96% + 2.27% (p = 0.0175). Reoxygenation time non-significantly decreased the RDW levels by 0.27% + 2.41% (p = 0.8889). Together, U-74389G administration and reoxygenation time non-significantly decreased the RDW levels by 2.54% + 1.39% (p = 0.0679). CONCLUSIONS: U-74389G administration particulary in concert without reperfusion declines the RDW levels even within the short - time context of 1.5 hours reperfusion.

Experimental study on multiaxial ratcheting behavior of vulcanized natural rubber

2009 ◽  
Vol 49 (3) ◽  
pp. 506-513 ◽  
Author(s):  
Yanping Wang ◽  
Xu Chen ◽  
Weiwei Yu ◽  
Lei Yan
Keyword(s):  
Experimental Study ◽  
Natural Rubber
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