Topic
Styrene-butadiene
About: Styrene-butadiene is a research topic. Over the lifetime, 5568 publications have been published within this topic receiving 62099 citations. The topic is also known as: styrene-butadiene rubber & SBR.
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TL;DR: In this paper, a dynamic computer model which can predict polymer and polymer particle properties such as molecular weight averages (MN and MW) and particle size distribution for the emulsion copolymerization of styrene/butadiene has been developed.
Abstract: A dynamic computer model which can predict polymer and polymer particle properties such as molecular weight averages (MN and MW) and (long chain branching frequency) and particle size distribution for the emulsion copolymerization of styrene/butadiene has been developed. Heat balances about the latex reactor and cooling jacket with proportional/integral control are included. This model can be used to design, optimize and control emulsion copolymerization in well-mixed stirred tank reactors operated in batch, semi-batch and continuous modes for transient and steady-state operation.
Details of modelling are described and then applications of the model are shown to illustrate the range of operational conditions of various production systems that can be investigated.
85 citations
TL;DR: In this article, the ability of the dichloro{1,4-dithiabutanediyl-2,2‘-bis(4,6-di-tert-butylphenoxy)}titanium complex to catalyze homopolymerization of conjugated dienes and copolymerisation of butadiene with styrene is reported.
Abstract: The ability of the dichloro{1,4-dithiabutanediyl-2,2‘-bis(4,6-di-tert-butylphenoxy)}titanium complex (1) to catalyze homopolymerization of conjugated dienes and copolymerization of butadiene with styrene is reported. After proper activation with methylalumoxane, 1 resulted active in the trans-1,4 selective polymerization of butadiene and isoprene with good activity. The molecular weight distributions of the polymers are monomodal with the polydispersity indexes, consistent with a single site behavior of the catalyst. Isotactic polystyrene-co-trans-1,4-polybutadiene with an unprecedented architecture, covering a wide range of compositions (xS = 0.15−0.97), were also obtained. The chemo- and stereoselectivity of butadiene insertion and the isospecific styrene polymerization of the title catalyst are retained when the two monomers are copolymerized. The molecular weight distributions are consistent with the material being copolymeric in nature. The reactivity ratios values and the microstructure analysis (by...
84 citations
TL;DR: The use of silanes to promote polymer-filler interactions is expected to limit the development of a percolated filler network and may also affect the mobility of polymer chains near the particles as mentioned in this paper.
Abstract: The introduction of silanes to improve processability and properties of silica-reinforced rubber compounds is critical to the successful commercial use of silica as a filler in tires and other applications. The use of silanes to promote polymer–filler interactions is expected to limit the development of a percolated filler network and may also affect the mobility of polymer chains near the particles. Styrene-butadiene rubber (SBR) was reinforced with silica particles at a filler volume fraction of 0.19, and various levels of filler–filler shielding agent (n-octyltriethoxysilane) and polymer–filler coupling agent (3-mercaptopropyltrimethoxysilane) were incorporated. Both types of silane inhibited the filler flocculation process during annealing the uncured rubber materials, thus reducing the magnitude of the Payne effect. In contrast to the significant reinforcement effects noted in the strain-dependent shear modulus, the bulk modulus from hydrostatic compression was largely unaltered by the silan...
84 citations
TL;DR: The analysis on the morphology, stress-strain behavior and dynamic mechanical behavior suggested distinct reinforcing mechanisms for LB- and CB-filled rubber composites, due to the difference in the surface properties and structural characteristic of fillers.
84 citations
TL;DR: Soybean bio-asphalt was prepared by vacuum distillation after esterification of soybean acidified oil as mentioned in this paper, which exhibited best performance in terms of penetration, softening point and ductility.
83 citations