Results 151 to 160 of about 4,985 (183)

Collaborative studies of thermo-oxidative degradation of styrene–isoprene diblock copolymer

Polymer, 2005
Abstract Mechanisms and dynamics of thermo-oxidative degradation of styrene- co -isoprene (SI) diblock at a temperature above the order–disorder transition temperature, T odt , have been investigated both experimentally and theoretically. The structural development of SI during degradation was monitored by optical microscopy, and the reduction of ...
Scott Meng, S.I. Kuchanov, Jingli Xu, Thein Kyu   +3 more
openaire   +1 more source

Degradation Behaviors of Natural, Guayule, and Synthetic Isoprene Rubbers

Rubber Chemistry and Technology, 1989
Abstract The degradation behavior of three isoprene based rubbers, NR, GR, and IR, under accelerated thermal and uv radiative environments have been investigated, and the extents of the degradation are compared. The oxidative degradation introduces oxygen atoms into the elastomer chains to form carbon—oxygen linkages via hydroxyl, ether ...
openaire   +1 more source

Degradation of sulfide linkages between isoprenes by lipid peroxidation catalyzed by manganese peroxidase

Chemosphere, 2009
Scission of sulfide linkages in vulcanized rubber has been a major concern since the early 20th century, because devulcanization is a key process for recycling waste rubber products as polymer materials that pose low environmental risks. We herein demonstrate that lipid peroxidation (LPO) of linoleic acid by manganese peroxidase (MnP), a proposed ...
Shin, Sato, Yasunori, Ohashi, Masaaki, Kojima, Takahito, Watanabe, Yoichi, Honda, Takashi, Watanabe   +5 more
openaire   +2 more sources

In vitro studies on the degradation of poly( cis ‐1,4‐isoprene)

Biotechnology Progress, 2018
Cleavage of the backbone of poly( cis ‐1,4‐isoprene) (IR) in solid rubber material was accomplished by the addition of partially purified latex clearing protein (Lcp1 VH2 ) using a 200‐mL enzyme reactor. Two strategies for the addition of Lcp1
R. Andler, A.‐L. Altenhoff, F. Mäsing, A. Steinbüchel   +3 more
openaire   +2 more sources

Degradation of Isoprene in the Presence of Sulphoxy Radical Anions

Journal of Atmospheric Chemistry, 2004
Autoxidation of S(IV) initiated by manganese sulphate or potassium peroxydisulphate in alkaline aqueous solutions was significantly slowed down by dissolved isoprene, which decayed in the process. The laboratory experiments were carried out in a batch, perfectly mixed reactor, which had no gas space.
openaire   +1 more source

Effect of gamma irradiation conditions on the radiation-induced degradation of isobutylene–isoprene rubber

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003
Abstract The effect of gamma irradiation conditions on the radiation-induced degradation of uncrosslinked, commercial isobutylene–isoprene rubbers has been investigated in this study. Influence of dose rate and irradiation atmosphere on the degradation of butyl rubber has been followed by viscosimetric and chromatographic analyses. Limiting viscosity
Deniz, V, Erdogan, SM, Sen, M, Uzun, C, Guven, O, Kantoglu, O   +5 more
openaire   +2 more sources

Bacterial and enzymatic degradation of poly(cis-1,4-isoprene) rubber: Novel biotechnological applications

Biotechnology Advances, 2020
Poly(cis-1,4-isoprene) rubber is a highly demanded elastomeric material mainly used for the manufacturing of tires. The end-cycle of rubber-made products is creating serious environmental concern and, therefore, different recycling processes have been proposed.
openaire   +2 more sources

Isoprene and its degradation products as strong ozone precursors in Insubria, Northern Italy

Atmospheric Environment, 2002
Abstract Frequent smog episodes occur during spring, summer, and autumn in Insubria, Northern Italy. On a test site in this area the atmospheric concentration of the photo-oxidants ozone and peroxyacetyl nitrate has been monitored over a year (2000) together with ozone precursors listed in the European Union Air Quality Directive 2002/3/EC, such as ...
M Duane, B Poma, D Rembges, C Astorga, B.R Larsen   +4 more
openaire   +1 more source

Satellite isoprene retrievals constrain emissions and atmospheric oxidation

Nature, 2020
Kelley C Wells, Dylan B Millet, Vivienne H Payne   +2 more
exaly  

Thermal Degradation of Butadiene and Isoprene Rubbers in Organic Solvents

International Polymer Science and Technology, 2009
E. I. Andreikov, I. S. Amosova
openaire   +1 more source