New Emulsion SBR Technology: Part I. Raw Polymer Study

2000 ◽  
Vol 73 (4) ◽  
pp. 731-742 ◽  
Author(s):  
Laurand Lewandowski ◽  
Morgan S. Sibbald ◽  
Ed Johnson ◽  
Michael P. Mallamaci
Keyword(s):  
Molecular Weight ◽  
World War Ii ◽  
High Molecular Weight ◽  
Viscoelastic Behavior ◽  
Flow Region ◽  
Size Exclusion ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Two Phase ◽  
Styrene Butadiene

Abstract Emulsion styrene—butadiene rubber (ESBR) has been the workhorse of the tire industry since World War II. With the development of solution polymers, ESBR has seen a steady decrease in its use in tire applications. A novel ESBR has been developed which imparts some of the rheological behavior previously only observed in solution polymers. This new ESBR was prepared by blending a high molecular weight elastomer with a low molecular weight elastomer, each having a unique styrene-butadiene composition. A two-phase co-continuous morphology was observed by scanning probe microscopy when the bound styrene difference between the two components was greater than 18%, consistent with the two glass transition temperatures measured by thermal analysis. Blending also served to reduce the amount of very high molecular weight material (> 107 g/mol) readily observed in 1502- and 1712-type polymers by thermal field flow fractionation (ThFFF). ThFFF was found to be superior to size exclusion chromatography for fully characterizing the molecular weight and molecular weight distribution of the polymers. Time—temperature superposition was performed to characterize the viscoelastic behavior in the rubbery plateau and terminal zones. The ESBR blends showed a cross-over in the terminal flow region that was not observed in 1502- and 1712-type polymers.

Bonding of Ultra High Molecular Weight Polyethylene to Styrene-Butadiene Rubber

1993 ◽  
Vol 66 (1) ◽  
pp. 92-97 ◽  
Author(s):  
Gary R. Hamed ◽  
Hasan S. Dweik
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Average Molecular Weight ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Molecular Weights ◽  
Order Of Magnitude ◽  
High Bond ◽  
Styrene Butadiene ◽  
Ultra High Molecular Weight

Abstract The adhesion between a sulfur-vulcanized SBR and polyethylenes (PE) of various molecular weights has been determined using a T-peel geometry. When the viscosity average molecular weight of the polyethylene exceeds about 700 k, bonding is sufficient to cause rubber tear during peeling. In contrast, with PE of Mv≈147k, joint strength is reduced by more than an order of magnitude and fracture proceeds between the SBR and PE. It is hypothesized that the high bond strength with the ultra high molecular weight polyethylene (UHMWPE) is due to the formation of entrapped tangles between chains of the two adherends. Consistent with this, SBR-UHMWPE bonds are not disrupted after extensive swelling in toluene.

Viscosity and Molecular Weight of Masticated Styrene-Butadiene Rubber

1965 ◽  
Vol 38 (4) ◽  
pp. 961-966 ◽  
Author(s):  
S. K. Bhatnagar ◽  
S. Banerjee
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Crosslink Density ◽  
Empirical Relation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Mooney Viscosity ◽  
The Times ◽  
Styrene Butadiene

Abstract Changes in the value of [η], [ηm], K′, (M) and μ of SBR masticated in the cold at 25.0 ± 5.0° C in presence of oxygen with the times of mastication are reported. An empirical relation has been developed between the intrinsic viscosity [η] and Mooney viscosity [ηm] which permits molecular weight of the rubber to be determined directly from Mooney viscosity. The value of g which appears in the Flory equation connecting true crosslink density with the physically determined one has been calculated for unfilled SBR.

Mechanical and viscoelastic behavior of natural rubber and carboxylated styrene-butadiene rubber latex blends

2003 ◽  
Vol 88 (11) ◽  
pp. 2639-2648 ◽  
Author(s):  
Ranimol Stephen ◽  
K. V. S. N. Raju ◽  
Sobha V. Nair ◽  
Siby Varghese ◽  
Zachariah Oommen ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Viscoelastic Behavior ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Latex ◽  
Carboxylated Styrene Butadiene Rubber ◽  
Styrene Butadiene

EFFECT OF REVERSIBLE ADDITION-FRAGMENTATION CHAIN TRANSFER EMULSION STYRENE–BUTADIENE RUBBER ON THE PROPERTIES OF SILICA COMPOUNDS

2020 ◽  
pp. 000-000 ◽  
Author(s):  
Hyunsung Mun ◽  
Kiwon Hwang ◽  
Gwanghoon Kwag ◽  
JaeKon Suh ◽  
Duseong Ahn ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Raft Polymerization ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Narrow Molecular Weight Distribution ◽  
Reversible Addition ◽  
Raft Agent ◽  
Styrene Butadiene

ABSTRACT In recent years, solution styrene–butadiene rubber (SSBR), which has a narrow molecular weight distribution, controllable microstructure, and chain end functionality, is mainly used as base rubber for passenger car tire tread compounds. However, SSBR has a lower molecular weight than that of emulsion SBR (ESBR) because it is difficult to increase the molecular weight of SSBR. In contrast, ESBR can easily increase the molecular weight; however, it has a broad molecular weight distribution. The reversible addition-fragmentation chain transfer (RAFT) polymerization technique is applicable to the emulsion polymerization. Polymers with narrow molecular weight distributions can be obtained by the RAFT polymerization because the RAFT agent prevents the coupling reaction of the growing chain radicals. In this case, ESBR having a narrow molecular weight distribution, which is an advantage of SSBR, and a high molecular weight, which is an advantage of ESBR, can be synthesized. Therefore, we synthesized RAFT ESBR and fabricated its compounds with silica filler. We confirmed that the physical properties of the RAFT ESBR silica compound are different from those of the ESBR silica compound. In addition to the narrow molecular weight distribution of the RAFT ESBR, the trithiocarbonyl group of the RAFT agent in the RAFT ESBR chain molecules affects the physical properties.

Composition-dependent depression of the glass transition temperature of the rubber phase in a PE-SBR blend

e-Polymers ◽  
2015 ◽  
Vol 15 (6) ◽  
pp. 393-399
Author(s):  
Ali Akbar Yousefi
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Domain Size ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Two Phase ◽  
Thin Polymer ◽  
Elastomeric Blend ◽  
Styrene Butadiene

AbstractA thermoplastic elastomeric blend was introduced based on high-density polyethylene and styrene-butadiene rubber (SBR). The morphology of the blend system was found to change from two-phase to co-continuous, depending on the polyethylene (PE) concentration. The thermo-mechanical measurements showed that, at the PE concentrations, which seemed to have a co-continuous morphology, the SBR inclusions were very fine. The fineness of the SBR domains resulted in a 20° depression of the glass transition temperature (Tg) of the SBR phase. This was attributed to the smooth interfaces at which the SBR chain sensed a higher free volume as compared with that in bulk SBR. A model correlating thin polymer thickness to the Tg of the confined polymer in the films was employed to correlate SBR domain size to the experimental Tg measured. The adjusting parameters A=129 and δ=1.45 were successfully used to fit the experimental data.

scholarly journals Prediction of the Styrene Butadiene Rubber Performance by Emulsion Polymerization Using Backpropagation Neural Network

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yan-jiang Jin ◽  
Ben-xian Shen ◽  
Ruo-fan Ren ◽  
Lei Yang ◽  
Jun Sui ◽  
...  
Keyword(s):  
Neural Network ◽  
Molecular Weight ◽  
National Standard ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Backpropagation Neural Network ◽  
Marquardt Algorithm ◽  
Molecular Weight Regulator ◽  
Styrene Butadiene ◽  
Original Formula

The effect of the amounts of initiator, emulsifier, and molecular weight regulator on the styrene butadiene rubber performance was investigated, based on the industrial original formula. It was found that the polymerization rate was increased with the increased dosage of initiator and emulsifier, and together with replenishing molecular weight regulator will make the Mooney viscosity of rubber meet the national standard when the conversion rate reaches 70%. The backpropagation neural network was trained by the original formula and ameliorated formula on the basis of Levenberg-Marquardt algorithm, and the relative error between the simulation results and experimental data is less than 1%. The good consistency shows that the BP neural network could predict the product performances in different formula conditions. It would pave the way for adjustment of the SBR formulation and prediction of the product performances.

scholarly journals Glycidyl Methacrylate-Emulsion Styrene Butadiene Rubber (GMA-ESBR)/Silica Wet Masterbatch Compound

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1000 ◽  
Author(s):  
Hyunsung Mun ◽  
Kiwon Hwang ◽  
Eunho Yu ◽  
Woong Kim ◽  
Wonho Kim
Keyword(s):  
Molecular Weight ◽  
Glycidyl Methacrylate ◽  
Functional Group ◽  
Rolling Resistance ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Manufacturing Method ◽  
Tire Industry ◽  
Styrene Butadiene ◽  
Resistance Performance

In the tire industry, solution styrene butadiene rubber (SSBR), which can introduce a functional group with good reactivity to silica at chain ends, is used to increase rolling resistance performance by considering fuel economy. However, this is not environmentally friendly because SSBR uses an organic solvent for polymerization, and it is difficult to increase its molecular weight. Functionalized emulsion SBR (ESBR) can solve the problems of SSBR. The molecular weight of ESBR molecules can be easily increased in an eco-friendly solvent, i.e., water. A functionalized ESBR introduces a functional group with good reactivity to silica by introducing a third monomer during polymerization. In this field, glycidyl methacrylate (GMA) has been reported to show the best properties as a third monomer. However, for GMA-ESBR, the viscosity is high and processability is disadvantageous. Therefore, we polymerized GMA-ESBR and manufactured silica compounds to clarify the causes of these problems. In addition, wet masterbatch (WMB) technology, which is a new compound manufacturing method, was applied to manufacture the silica compound, and the physical properties are compared with those of a dry masterbatch. The results clarified the problem of GMA-ESBR, which could be solved by using WMB technology.

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