Viscoelastic properties of blends of styrene-butadiene diblock copolymer and high molecular weight homopolybutadiene

1984 ◽  
Vol 17 (3) ◽  
pp. 342-348 ◽  
Author(s):  
Hiroshi Watanabe ◽  
Tadao Kotaka
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Diblock Copolymer ◽  
Viscoelastic Properties ◽  
Styrene Butadiene

Modification of Interfacial Properties of Polymer Blends with Diblock Copolymer

1996 ◽  
Vol 461 ◽  
Author(s):  
S. Kim ◽  
C. C. Han
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Polymer Blends ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Phase Region ◽  
Domain Growth ◽  
Two Phase ◽  
Phase Separation Kinetics ◽  
Styrene Butadiene

ABSTRACTThe effect of diblock copolymer on the phase-separation process of polymer blends has been investigated by using light scattering and optical microscopic observations. To quench the system into the two phase region, a shear-jump technique is employed instead of the conventional temperature-jump technique. The samples studied are blends of low-molecular-weight polystyrene and polybutadiene with and without added styrene-butadiene block copolymer as a compatibilizer. It was observed that the addition of diblock copolymers could accelerate the phase separation kinetics depending on the shear history. As the concentration of diblock copolymer increases, the distribution of domain sizes becomes narrower and the growth rate slows down. The extent of slowing-down depends on the molecular weight and concentration of the copolymer. The time dependence of domain growth is clearly observed with optical microscopy.

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.

Viscoelastic properties of high molecular weight polymers in the molten state

1979 ◽  
Vol 18 (5) ◽  
pp. 629-634 ◽  
Author(s):  
G. Marin ◽  
J. P. Montfort ◽  
J. Arman ◽  
Ph. Monge
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Viscoelastic Properties ◽  
Molten State ◽  
High Molecular Weight Polymers

Synthesis, Characterization, and Viscoelastic Properties of High Molecular Weight Hyperbranched Polyglycerols

2006 ◽  
Vol 39 (22) ◽  
pp. 7708-7717 ◽  
Author(s):  
Rajesh Kumar Kainthan ◽  
Edward B. Muliawan ◽  
Savvas G. Hatzikiriakos ◽  
Donald E. Brooks
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Viscoelastic Properties

Infinite-Dilution Viscoelastic Properties of Polystyrene of Very High Molecular Weight

1978 ◽  
Vol 11 (5) ◽  
pp. 1060-1062 ◽  
Author(s):  
Robin W. Rosser ◽  
John L. Schrag ◽  
John D. Ferry
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Viscoelastic Properties ◽  
Infinite Dilution ◽  
Very High
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