Hydrogenated styrenic block copolymer

Uniprene- XL Hydrogenated-styrene block copolymer (H-SBC) PP Teknor-Apex... 

Septon Hydrogenated styrenic block copolymer Kuraray Co., Ltd. 

Low dielectric constanL high electrical resistance, high dielectric strength, and low power factor make hydrogenated styrenic block copolymers and EPDM/PP TPVs espe-... 

SBS and SIS can be subsequently hydrogenated to form SEBS and SEPS, respectively. SEBS is obtained from SBS with a higher vinyl content (typically around 30%) in order to avoid crystallization of the mid-block. The properties of all four of these common styrenic block copolymers are displayed in Table 2. 

S. Schiff, USP 3416899 (1968) CA 70, 39432 (1969). A napalm-type material is prepd by hydrogenation of a hydrocarbon soln of a 3 1 butadiene-styrene block copolymer... 

The use of olefin rubbers [18] as good impact modifiers for sPS when used in conjunction with S-B or S-B-S block copolymers, which may be hydrogenated in the butadiene phase, has also been described. Instead of butadiene, isoprene can be used. Examples of the olefinic polymers are polyethylene, ethylene-propylene rubbers (EPR) and polypropylene-(ethylene propylene rubber) block copolymers. Here the styrene block copolymers presumably function as... 

If we look at the three panels of data in Figure 21.4, we can begin to appreciate the intractable nature of some of the styrene-hydrogenated rubber-styrene block copolymers. The right panel shows an SBS polymer (not hydrogenated) that is typical in its overall size and styrene content for a commercial polymer. Viscosity is plotted versus shear stress at two testing temperatures (200 and 220 CC) for this SBS polymer, and it serves as our reference point for the center panel. 

The complete hydrogenation of block copolymers of styrene with diene monomers has been reported. Poly(styrene- /oc -diene) based block copolymers in which the polydiene block has been hydrogenated have been commercially available since the 1960s. The most common polymeric structures of this type are based on poly(styrene-bl-butadiene-bl-styrene) and poly(styrene-bl-... 

Despite the body of patent literature describing fully hydrogenated block copolymers and their properties, it has been suggested that complete saturation of styrenic block copolymers with butadiene would result in materials that were incapable of microphase separation. This argument was based on the supposition that the difference in solubility parameters of the fully saturated block copolymer would be so slight that they would not have useful mechanical properties at achievable molecular weights [58]. This assumption has since... 

S/DPE copolymers can also be impact modified using triblock copolymers having as the centre block the rubber phase [6]. Typical examples are styrene-butadiene-styrene block copolymers where the butadiene phase is preferably hydrogenated S-B(H)-S, to remove the double bonds. This is advisable owing to the high processing temperatures involved in the S/DPE processing. 

The resulting TPE can either be used alone or blended with aliphatic oil and polypropylene. In the former case a higher tensile strength and elongation at break are obtained in comparison with the commercially available styrene-hydrogenated butadiene-styrene block copolymers, especially at high temperatures. 

Hydrogenated chlorosulfonated butadiene-styrene block copolymer Maleated-LLDPE... 

SEBS Styrene-ethylene-butylene-styrene block copolymer (hydrogenated SIS)... 

---