Insights into Sulfur Vulcanization from QSPR Quantitative Structure-Property Relationships Studies

1999 ◽  
Vol 72 (2) ◽  
pp. 318-333 ◽  
Author(s):  
Fred Ignatz-Hoover ◽  
Alan R. Katritzky ◽  
Victor S. Lobanov ◽  
Mati Karelson
Keyword(s):  
Molecular Descriptors ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Structure Property ◽  
Concerted Mechanism ◽  
Structure Property Relationships ◽  
Quantitative Structure Property Relationships ◽  
Crosslinking Reactions ◽  
Styrene Butadiene ◽  
Aromatic Heterocyclic

Abstract Vulcanization of styrene-butadiene rubber, as accelerated by a series of sulfenamides and sulfenimides prepared from various aromatic heterocyclic thiols and various aliphatic amines, was studied using the curemeter under isothermal conditions. Further studies using MOPAC AM1 semiempirical quantum mechanical calculations and CODESSA QSAR software yielded excellent correlations of molecular descriptors of accelerators or accelerator thiolate zinc complexes to the onset of cure and maximum rate of vulcanization. The QSAR results support previously proposed mechanisms describing the origin of scorch delay for the delayed action, fast curing sulfenamide accelerators. In addition, the results support a carbanionic concerted mechanism for the sulfurization and crosslinking reactions.

New insight into structure-property relationships of natural rubber and styrene-butadiene rubber nanocomposites filled with MWCNT

Polymer ◽  
2020 ◽  
Vol 201 ◽  
pp. 122604 ◽  
Author(s):  
Pilar Bernal-Ortega ◽  
M. Mar Bernal ◽  
Antonio González-Jiménez ◽  
P. Posadas ◽  
Rodrigo Navarro ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Rubber Nanocomposites ◽  
Styrene Butadiene ◽  
Insight Into

scholarly journals Crosslinked Elastomers: Structure–Property Relationships and Stress-Optical Law

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 9
Author(s):  
Paul Sotta ◽  
Pierre-Antoine Albouy ◽  
Mohammad Abou Taha ◽  
Benoit Moreaux ◽  
Caroline Fayolle
Keyword(s):  
Styrene Butadiene Rubber ◽  
Multiple Quantum ◽  
Butadiene Rubber ◽  
Structure Property ◽  
Advanced Technique ◽  
Entropic Elasticity ◽  
Structure Property Relationships ◽  
X Ray Scattering ◽  
Styrene Butadiene ◽  
Segmental Orientation

We present a combination of independent techniques in order to characterize crosslinked elastomers. We combine well-established macroscopic methods, such as rheological and mechanical experiments and equilibrium swelling measurements, a more advanced technique such as proton multiple-quantum NMR, and a new method to measure stress-induced segmental orientation by in situ tensile X-ray scattering. All of these techniques give access to the response of the elastomer network in relation to the crosslinking of the systems. Based on entropic elasticity theory, all these quantities are related to segmental orientation effects through the so-called stress-optical law. By means of the combination of these techniques, we investigate a set of unfilled sulfur-vulcanized styrene butadiene rubber elastomers with different levels of crosslinking. We validate that the results of all methods correlate very well. The relevance of this approach is that it can be applied in any elastomer materials, including materials representative of various industrial application, without prerequisite as regards, e.g., optical transparency or simplified formulation. Moreover, the approach may be used to study reinforcement effects in filled elastomers with nanoparticles.

scholarly journals An Investigation on the Thermally Induced Compatibilization of SBR and α-Methylstyrene/Styrene Resin

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1267
Author(s):  
Arnaud Wolf ◽  
João Paulo Cosas Fernandes ◽  
Chuanyu Yan ◽  
Reiner Dieden ◽  
Laurent Poorters ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Viscoelastic Properties ◽  
Viscoelastic Behavior ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Thermally Induced ◽  
And Performance ◽  
Crosslinking Reactions ◽  
Styrene Butadiene

The miscibility between two polymers such as rubbers and performance resins is crucial to achieve given targeted properties in terms of tire performances. To this aim, α-methylstyrene/styrene resin (poly(αMSt-co-St)) are used to modify the viscoelastic behavior of rubbers and to fulfill the requirements of the final applications. The initial aim of this work was to understand the influence of poly(αMSt-co-St) resins blended at different concentrations in a commercial styrene-butadiene rubber (SBR). Interestingly, while studying the viscoelastic properties of SBR blends with poly(αMSt-co-St), crosslinking of the rubber was observed under conditions where it was not expected to happen. Surprisingly, after the crosslinking reactions, the poly(αMSt-co-St) resin was irreversibly miscible with SBR at concentrations far above its immiscibility threshold. A detailed investigation involving characterization technics including solid state nuclear magnetic resonance led to the conclusion that poly(αMSt-co-St) is depolymerizing under heating and can graft onto the chains of SBR. It results in an irreversible compatibilization mechanism between the rubber and the resin.

Effects of White Rot Fungus Physisporinus sp., Isolated in Japan, on Styrene-butadiene Rubber

2020 ◽  
Vol 93 (9) ◽  
pp. 289-292
Author(s):  
Yumi SHIMIZU ◽  
Shuma SATHO ◽  
Taro NAKAJIMA ◽  
Hiroaki KOUZAI ◽  
Kiminori SHIMIZU
Keyword(s):  
White Rot ◽  
White Rot Fungus ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene
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