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.

Prediction of the glass transition temperature and design of phase diagrams of butadiene rubber and styrene–butadiene rubber via molecular dynamics simulations

2017 ◽  
Vol 19 (25) ◽  
pp. 16498-16506 ◽  
Author(s):  
Myung Shin Ryu ◽  
Hyoung Gyu Kim ◽  
Hyun You Kim ◽  
Kyung-Shin Min ◽  
Hak Joo Kim ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Molecular Dynamics Simulations ◽  
Phase Diagrams ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Dynamics Simulations ◽  
Styrene Butadiene

In this study, we developed an equation to evaluate the pseudo-ternary Tg of quaternary SBR and plotted the ternary contour Tg plot for SBR with a variety of styrene compositions.

scholarly journals Nanocomposites of NR/SBR Blend Prepared by Latex Casting Method: Effects of Nano-TiO2 and Polystyrene-Encapsulated Nano-TiO2 on the Cure Characteristics, Physical Properties, and Morphology

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Anyaporn Boonmahitthisud ◽  
Peeraphong Pokphat ◽  
Phasawat Chaiwutthinan ◽  
Saowaroj Chuayjuljit
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Casting Method ◽  
Nano Tio2 ◽  
Tear Strength ◽  
Cure Characteristics

Nanocomposites of 80/20 (w/w) natural rubber (NR)/styrene butadiene rubber (SBR) blend with four loadings of either nanosized titanium dioxide (nTiO2) or polystyrene-encapsulated nTiO2 (PS-nTiO2), ranging from 3 to 9 parts by weight per hundred of rubber (phr), were prepared by latex casting method. The PS-nTiO2 synthesized via in situ differential microemulsion polymerization displayed a core-shell morphology (nTiO2 core and PS shell) with an average diameter of 42 nm. The cure characteristics (scorch time, cure time, and cure rate index), mechanical properties (tensile properties, tear strength, and hardness), thermal stability, glass transition temperature, and morphology of the prepared nanocomposites were quantified and compared. The results showed that the cure characteristics of all the nanocomposites were not significantly changed compared to those of the neat NR/SBR blend. The inclusion of an appropriate amount of either nTiO2 or PS-nTiO2 into the NR/SBR blend apparently improved the tensile strength, modulus at 300% strain, tear strength, hardness, and thermal stability but deteriorated the elongation at break of the nanocomposites. Based on differential scanning calorimetry, the glass transition temperature of all the nanocomposites was similar to that of the neat NR/SBR blend. Moreover, the morphology of the PS-nTiO2-filled rubber nanocomposites fractured surface analyzed by scanning electron microscopy showed an improvement in the interfacial adhesion between the rubber phase and the nanoparticles.

The glass transition and interfacial layer in styrene-butadiene rubber containing silica nanofiller

Polymer ◽  
2003 ◽  
Vol 44 (20) ◽  
pp. 6259-6266 ◽  
Author(s):  
V Arrighi ◽  
I.J McEwen ◽  
H Qian ◽  
M.B Serrano Prieto
Keyword(s):  
Glass Transition ◽  
Interfacial Layer ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Styrene Butadiene

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.

scholarly journals A study of Supported Poly (n-butyl methacrylate) (PBMA) Thin Polymer Films Near the Glass Transition Temperature

2017 ◽  
Vol 14 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Rami Omari ◽  
Gilbert Ayuk
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Correlation Functions ◽  
Relaxation Times ◽  
Surface Relaxation ◽  
Butyl Methacrylate ◽  
Surface Dynamics ◽  
Thin Polymer ◽  
Bulk Relaxation

The glass transition temperature and the surface dynamics of poly (butyl methacrylate) (PBMA) films have been studied using a phase-modulated ellipsometer equipped with a home-built sample cell with temperature controller. Experiments were performed for a range of temperatures, both above and below the glass transition temperature (Tg). In our study the glass transition temperature was obtained by plotting the ellipticity, as a function of temperature using the data from the ellipsometric cooling scan. the correlation functions governing the fluctuations were calculated at each temperature from the time-dependent fluctuations in film thickness as a function of temperature using ellipsometry data collected at 50 Hz frequency. The results indicate that at temperatures well above Tg, the correlation functions obey a simple exponential decay. However, as Tg is approached, the correlation functions are best fitted with a stretched exponential relation, indicating a broad distribution of relaxation times. In addition, the temperature dependence of surface relaxation process has been found to be much weaker compared to the bulk relaxation.

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