Effect of Casting Solvents on the Properties of Styrene-Butadiene-Styrene Block Copolymers Studied by Positron Annihilation Techniques

This work presents the results of optimization compositions of polymer-modified binder (PMB) by a compromise task. The conducted study of influence two prescription factors – containing styrene-butadiene-styrene and sulfur – on which is a set of indicators of polymer-bitumen binders were carried out. The regularities of these factors of mutual influence were established by such indicators as the Fraas brittleness temperature, penetration, softening point, ductility. The dosages of SBS and sulfur have been determined by ensuring the achievement of the required level of PBB indicators in accordance with GOST R 52056-2003 «Bitumen-polymer road binders are based on styrene-butadiene-styrene block copolymers. Specifications».

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Crazing in thin films of styrene–butadiene–styrene block copolymers

Journal of Polymer Science Part B Polymer Physics ◽

10.1002/polb.1986.090241002 ◽

1986 ◽

Vol 24 (10) ◽

pp. 2167-2183 ◽

Cited By ~ 11

Author(s):

B. Koltisko ◽

A. Hiltner ◽

E. Baer ◽

L. H. Tung

Keyword(s):

Thin Films ◽

Block Copolymers ◽

Styrene Butadiene Styrene ◽

Styrene Butadiene ◽

Butadiene Styrene

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Properties of Random and Block Copolymers of Butadiene and Styrene. III. Three Sequence Styrene-Butadiene-Styrene Block Polymers

Rubber Chemistry and Technology ◽

10.5254/1.3539130 ◽

1967 ◽

Vol 40 (4) ◽

pp. 1183-1199 ◽

Cited By ~ 33

Author(s):

C. W. Childers ◽

G. Kraus

Keyword(s):

Tensile Strength ◽

Block Copolymers ◽

Polymer Chains ◽

Two Phase ◽

Styrene Copolymers ◽

Relaxation Measurements ◽

Styrene Butadiene Styrene ◽

Increasing Temperature ◽

Styrene Butadiene ◽

Butadiene Styrene

Abstract In butadiene styrene copolymers containing long block sequences chain segments associate with like segments to form a two phase structure. Properties of such polymers are dependent not only on composition and molecular weight but also on block sequence along the chain. Polymers containing two or more polystyrene blocks per molecule form networks and exhibit elastomeric properties in the uncured state resembling those of filler reinforced vulcanizates. This behavior is shown both by linear styrene-butadiene-styrene elastomers and multichain block copolymers branched in the polybutadiene blocks. A prominent loss tangent peak was observed around —40° C for the multichain polymers. Stress strain following prestretching and stress relaxation measurements indicate some shifting of polystyrene associations during stretching. Tensile strength is reduced by increasing temperature and addition of plasticizers. Reinforcement by polystyrene domains in vulcanized block copolymers is evident from tensile strength, dynamic modulus, and swelling measurements, but decreases with increased crosslinking. The number of styrene sequences in the primary molecules is less important after vulcanization as crosslinking destroys the individuality of the original polymer chains.

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Viscoelastic Behavior of Styrene-Butadiene-Styrene Block Copolymers in Temperature Range of Glass-Rubber Transition of Styrene Block

Rubber Chemistry and Technology ◽

10.5254/1.3538359 ◽

1996 ◽

Vol 69 (1) ◽

pp. 73-80 ◽

Cited By ~ 8

Author(s):

N. Nakajima

Keyword(s):

Molecular Weight ◽

Block Copolymers ◽

Viscoelastic Behavior ◽

Shear Mode ◽

Molecular Weight Polymer ◽

Styrene Butadiene Styrene ◽

The Difference ◽

Tan Δ ◽

Styrene Butadiene ◽

Butadiene Styrene

Abstract Dynamic mechanical measurements were performed with styrene-butadiene-styrene (SBS) block copolymers, Kraton D-1101 and D-l 102. Isochronal data were obtained from −130 to 85°C in the tensile mode at 1 Hz and from 60 to 160°C in the shear mode at 1 rad/s. The isothermal measurements were also performed at 60, 90, 120, 140, and 160°C in the frequency range of 0.0316 to 100 rad/s. The results suggest that the two polymers have different morphologies although the styrene content and the diblock content are about the same for both polymers. Kraton D-1101, which has 1.5 times higher molecular weight, has 3–5 times higher rubbery modulus, compared to D-1102. The lower molecular weight polymer, D-1102, appears to have a larger amount of the mixed phase at the boundary. This is suggest by the lower temperature of the “domain disruption”, Tdd and the higher magnitude of tan δ at Tdd. This explains the difference in the rubbery moduli of the two polymers.

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