Styrene-butadiene viscoelastic properties

Vinogradov G.V., Dreval V.E., Malkin A.Y., Yanovskii Yu G., Barancheeva V.V., Borisenkova E.K., Zabugina M.P., Plotnikova E.P., and Sabsai O.Y. Viscoelastic properties of butadiene-styrene block copolymers, Rheol. Acta, 17, 258, 1978. 

The viscoelastic properties of the crystalline zones are significantly different from those of the amorphous phase, and consequently semicrystalline polymers may be considered to be made up of two phases each with its own viscoelastic properties. The best known model to study the viscoelastic behavior of polymers was developed for copolymers as ABS (acrylonitrile-butadiene-styrene triblock copolymer). In this system, spheres of rubber are immersed in a glassy matrix. Two cases can be considered. If the stress is uniform in a polyphase, the contribution of the phases to the complex tensile compliance should be additive. However, if the strain is uniform, then the contribution of the polyphases to the complex modulus is additive. The... 

Varkey, J.T. Augustine, S. Groeninckx, G. Bhagawan, S.S. Rao, S.S. Thomas, S. Morphology and mechanical and viscoelastic properties of natural rubber and styrene butadiene rubber latex blends. J. Polym. Sci. B Polym. Phys. 2000,38 (16), 2189-2211. 

The viscoelastic properties of concentrated solutions of styrene-butadiene star-block copolymers were studied by Masuda et al. [296] in good solvents for both blocks and in selective ones. A significant dependence of the loss and storage moduli on the strain amplitude was observed in the case of dibutylphthalate, a selectively good solvent for the PS blocks at temperatures below 60 °C, which indicates the presence of a microdomain structure due to self assembling of the insoluble blocks. At a certain value of the applied strain the microdomain structure in solution was disrupted. 

Smith, T.L., Dickie, R.A., 1969. Viscoelastic and ultimate tensile properties of styrene-butadiene-styrene block copolymers. J. Polym. Sci. Polym. Symp. 26 (1), 163-187. 

Jong, L., Peterson, S.C. Effects of soy protein nanoparticle aggregate size on the viscoelastic properties of styrene-butadiene composites. Compos. A Appl. Sci. Manuf. 39(11), 1768-1777 (2008)... 

In a complementary paper by Class and Chu, model resins - polystyrene and poly(vinylcyclohexane) - in combination with natural and styrene-butadiene rubbers, were used to study effects of resin structure, molecular weight and concentration on viscoelastic properties of pressure-sensitive adhesives resulting from these combinations. 

The structure of the low molecular weight resin is very important to its compatibility with elastomers and, consequently, to its effect on viscoelastic properties and performance as a pressure sensitive adhesive. A completely aromatic resin such as polystyrene has poor compatibility with natural rubber, but is compatible with styrene-butadiene rubber. A cycloaliphatic resin such as poly(vinyl cyclohexane) is compatible with natural rubber and is incompatible with styrene-butadiene rubber. An alkyl aromatic resin such as poly-(tert-butyl styrene) is compatible with both elastomers. 

Styrene-butadiene-styrene (S-B-S) block copolymers are used in bitumen roofing formulations because of their suitable dynamic viscoelastic properties. 

Various workers have discussed aspects other than those mentioned above in studies of the viscoelastic properties of polymers. These include PVOH [62], hydroxy-terminated polybutadiene [63], styrene-butadiene and neoprene-type blends [64], and polyamidoimides [65]. Other aspects of viscoelasticity that have been studied include relaxation phenomena in PP [66] and methylmethacrylate-N-methyl glutarimide copolymers [67], shear flow of high-density polyethylene [68], Tg of PMMA and its copolymers with N-substituted maleimide [69] and ethylene-vinyl acetate copolymers [70], and creep behaviour of poly(p-phenylene terephthalate) [71] and PE [72]. 

Since diffusion measurements are far easier to make than the viscoelastic measurements which are needed to determine o. they may be useful for practical purposes to estimate under certain circumstances, for predicting the time scale of the transition zone of viscoelastic properties. For example, measurements on 34 polybutadienes and random styrene-butadiene copolymers with different bu-... 

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