Rheological Characterization and Mechanical Behavior of Polymer Powder Modified-Cement Pastes and Wollastonite Fibers Reinforced Cement Pastes

2012 ◽  
Author(s):  
Fabrício de C. Vitorino ◽  
Romildo D. Toledo Filho
Keyword(s):  
Rheological Properties ◽  
Coaxial Cylinder ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rheological Characterization ◽  
Rotational Viscometer ◽  
Cement Pastes ◽  
Polymer Powder ◽  
Reinforced Cement ◽  
Styrene Butadiene

In the design of oil wells subjected to temperature variations and imposed deformations, the fracture toughness of the cement pastes is a very important property. In order to obtain higher toughness values and adequate rheological properties, cement pastes modified by polymer and reinforced by wollastonite microfibers were developed and studied. In the present case, the redispersible polymer powder used was the styrene-butadiene rubber (SBR). The pastes were mechanically characterized by the evaluation of compressive strength, Young’s modulus, Poisson’s ratio and strain capacity. The rheological properties, such as plastic viscosity, yield point and gel strength, were obtained in a Couette coaxial cylinder rotational viscometer.

RHEOLOGICAL PROPERTIES OF STYRENE BUTADIENE RUBBER MODIFIED BITUMEN BINDER

2016 ◽  
Vol 78 (7-2) ◽  
Author(s):  
Haryati Yaacob ◽  
Moazzam Ali Mughal ◽  
Ramadhansyah Putra Jaya ◽  
Mohd Rosli Hainin ◽  
Dewi Sri Jayanti ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Rheological Properties ◽  
Great Influence ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Complex Shear Modulus ◽  
Modified Bitumen ◽  
Rotational Viscometer ◽  
Complex Shear ◽  
Styrene Butadiene

The study investigates the rheological properties of bitumen of 60-70 penetration grade modified with Styrene Butadiene Rubber (SBR). SBR is an elastomer which is an important sort of synthetic rubber. It is a copolymer whose molecular structure primarily consists of organic compound styrene and butadiene chain. Bitumen is visco-elastic in nature. The rate of load application and temperature has a great influence on its performance. Various fundamental properties of bitumen were evaluated, namely complex shear modulus (G*), short-term ageing, long-term ageing, viscosity, penetration and softening point by using Dynamic Shear Rheometer (DSR), Rolling Thin Film Oven Test (RTFOT), Pressure Aging Vessel (PAV), Rotational Viscometer (RV), Penetrometer and Ring and Ball Test, respectively. The binders were mixed with varying percentage of SBR i.e. 0, 1, 2, 3, 4, and 5% by the weight of bitumen binder. The use of SBR has played an active role in improving the viscoelastic properties of bitumen. The use of SBR modifier changes the rheological behavior of bitumen by increasing its complex shear modulus (G*) and the resistance of mixture against permanent deformation (rutting). It was also found that increasing the content of SBR led to the increase in viscosity of modified bitumen, which helps in elevating the mixing and compaction temperature of asphalt mixtures.

Preferential Media for Abrasive Flow Machining

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
Kamal K. Kar ◽  
N. L. Ravikumar ◽  
Piyushkumar B. Tailor ◽  
J. Ramkumar ◽  
D. Sathiyamoorthy
Keyword(s):  
Rheological Properties ◽  
Testing Machine ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Abrasive Flow Machining ◽  
Wide Range ◽  
Good Improvement ◽  
Temperature Shear ◽  
Styrene Butadiene ◽  
Surface Improvement

The abrasive flow machining (AFM) is used to deburr, radius, polish and remove recast layer of components in a wide range of applications. Material is removed from the workpiece by a flowing semisolid mass across the surface to be finished. In this study a medium for AFM has been developed from the various viscoelastic carriers and has been contrasted through experimental investigation. The viscoelastic media are selected on the basis of existing media through the studies of thermogravimetric analysis and are characterized by mechanical, as well as rheological, properties with the help of a universal testing machine and a rheometer. The performance of the medium is evaluated through the finishing criteria on a two-way AFM setup. The investigation reveals that the styrene butadiene rubber (SBR) medium gives a good improvement in surface finish. The surface improvement through SBR media is 88%. It is also found that the strain, temperature, shear rate, time of applied constant stress, cyclic loading, etc. have an impact on the mechanical and rheological properties of the newly developed medium, which are ultimately governed by the performance of the medium in the target applications.

Synthesis and Rheological Characterization of Branched Versus Linear Solution Styrene-Butadiene Rubber

2002 ◽  
Vol 75 (2) ◽  
pp. 299-308 ◽  
Author(s):  
Michael L. Kerns ◽  
Steven K. Henning
Keyword(s):  
Light Scattering ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rheological Characterization ◽  
Relative Level ◽  
Polymer Backbone ◽  
Linear Solution ◽  
Independent Variable ◽  
Styrene Butadiene

Abstract By mediating the reactivity of the initiator/modifier system toward metallation of the polymer backbone, we have developed synthetic strategies that effectively control the relative level of branching and polydispersity in SSBR. This development has allowed for the optimization of both the microstructure and macrostructure of solution elastomers to meet the demands of a given application. In this study, we have taken the approach of controlling the polymer macrostructure by adjusting our initiator/modifier system so as to mediate the propensity for backbone metallation to occur. Understanding it is from the metallated sites along the polymer backbone that branches tend to propagate, we have demonstrated the ability to produce varying degrees of branching. Several synthetic strategies were employed in order to impose control over the levels of branching in solution SBRs. The macrostructure is the independent variable in this study and subtle differences can have profound effects on the rheology and, thus, mixing, extruding and even physical properties of the resultant compound. Polymer samples were characterized by light scattering and several rheological tests to determine the relative levels of branching in order to verify the proposed synthetic mechanisms that underlie branching control.

scholarly journals Evaluation of Chicken Feather and Styrene-Butadiene/Chicken Feather Composites as Modifier for Asphalts Binder

2019 ◽  
Vol 9 (23) ◽  
pp. 5188 ◽  
Author(s):  
Leslie Mariella Colunga-Sánchez ◽  
Beatriz Adriana Salazar-Cruz ◽  
José Luis Rivera-Armenta ◽  
Ana Beatriz Morales-Cepeda ◽  
Claudia Esmeralda Ramos-Gálvan ◽  
...  
Keyword(s):  
Phase Separation ◽  
Rheological Properties ◽  
Asphalt Binder ◽  
Waste Product ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Chicken Feather ◽  
Main Component ◽  
Styrene Butadiene

In the present work, the evaluation of chicken feather particles (CFP) and styrene-butadiene/chicken feather (SBS-CF) composites as modifiers for asphalt binder is presented. It is well known that elastomers are the best asphalt modifiers, because their thermoplastic behavior assists asphalts in improving the range of their mechanical properties at both low and high temperatures. Nowadays, the use of natural products and byproducts as fillers for polymer matrices has been a matter of research, and the field of asphalt modification is not the exception. Chicken feather particles (CFP) is a waste material whose main component is keratin, which offers remarkable properties. In the present work, CFP was used as a filler of a styrene-butadiene rubber matrix (SBS) with radial structure, to obtain a composite intended as an asphalt modifier. Besides, raw CFP was also tested as an asphalt modifier. Physical, thermal and rheological properties of the modified asphalts were evaluated in order to determine their degree of modification with respect to the original asphalt. The results show that the addition of raw CFP improves some physical properties as penetration and decreases the phase separation; furthermore, the asphalt modified with CFP displayed similar rheological properties to those shown by the asphalt modified with SBS, while some other properties resulted in being even better, like the phase separation, with the advantage that the CFP comes from a natural waste product.

Evaluation of morphological, mechanical, and rheological properties of vulcanized styrene–butadiene rubber/modified corn starch blends

2019 ◽  
Vol 28 (1) ◽  
pp. 45-53
Author(s):  
Ismaeel Moslam Alwaan
Keyword(s):  
Rheological Properties ◽  
Corn Starch ◽  
Tensile Modulus ◽  
Styrene Butadiene Rubber ◽  
Yeast Fermentation ◽  
Butadiene Rubber ◽  
Current Product ◽  
Fertilizer Release ◽  
Rate Of Absorption ◽  
Styrene Butadiene

The starch-filled styrene–butadiene rubber (SBR) was prepared using a laboratory-sized two-roll mill. Starch was modified by yeast fermentation for 1 day before it was blended with SBR. The hydrophilicity of SBR was enhanced by grafting with modified starch (MST) by utilizing tetramethyl thiuram disulfide as a catalyst. The effect of modified corn starch loading on morphological, mechanical, and rheological properties of vulcanized SBR blends was investigated. Scanning electron microscope result revealed that the adhesion between the MST and SBR was weak, and the starch pulled out due to poor interfacial bonding. The lowest ultimate tensile strength, elongation at break, and tensile modulus of the SBR- g-MST were found in the sample containing 150 phr of starch. The variation of the percentage elongation of neat rubber and MST/rubber composites was 91.34%. The significant decrease in cure times was observed with the loading of MST in all blends up to 100 phr starch, while no significant change in scorch time was observed. The maximum torque, minimum torque, and cross-linking density increased as the starch loading increases up to 100 phr MST. The water absorption by the composite increases with immersion time and MST loading, although the rate of absorption decreases with increased time. The current product could be especially advantageous in agricultural and horticultural applications as a good controlled fertilizer release and for water retention.

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