SEBS block copolymer

Impact strength toughness PVC, PP, PE ABS, ASA, SEBS, Block copolymer, SEBS, EPR, EPDM,... 

EPDM-g-glycidyl methacrylate SEBS block copolymer polypropylene... 

Figure 4. Chemical structure of sulfonated SEBS block copolymer.

Figure 21.8 Endblock size effect on softening point of various SEBS block copolymers by L. K. Djiauw, Kraton Polymers LLC (internal communication), Westhollow Technology Center, Houston, TX (1999)...

Poly(styrene-6-ethylene-co-butylene-/)-styrene) (SEBS) block copolymers... 

Barra, G.M.O., Jacques, L.B., Orefice, R. L and Carneiro, J.R.G. (2004) Processing, characterization and properties of conducting polyaniline-sulfonated SEBS block copolymers. Eur. Polym.J., 40, 2017-2023. 

Thermoplastic polyolefin (TPO) is a generic name that refers to polyolefin blends usually consisting of some fraction of polypropylene (PP), polyethylene (PE) or polypropylene block copolymer (PP-b-EP or BCPP ), and a thermoplastic olefinic rubber, with or without a mineral reinforcing filler such as talc or wollastonite. Common rubbers include ethylene propylene rubber (EPR), EPDM rubber, ethylene-octene (EO) copolymer mbber, ethylene-butadiene (EB), and styrene-ethylene-butadiene-styrene (SEBS) block copolymer rubbers. Currently, there are a great variety of commercial polypropylene homopolymers, PP block copolymers, and olefinic rubbers available to make a wide range of TPO blends with densities ranging from 0.92 to 1.1. 

Natural polystyrene has a strong tendency to crack, and can only be used in most potential applications when modified to form high-impact or toughened polystyrene grades or ABS. It can be toughened by polybutadiene, butadiene-acrylonitrile copolymer rubber, or SBS or SEBS block copolymers. The rubber can be added before or after polymerisation of the styrene monomer. In the case of polybutadiene, two reactions take place styrene polymerisation, and graft copolymerisation of the styrene with the polybutadiene. A brief outline of this operation is available on the Dynasol website (www.dynasolesastomers.com). 

These have often been modified by addition of PE. Blends with polyoxymethylene showed complex anomalous behavior due to interfacial phenomena [34]. PE appeared useful as a melt flow promoter in polyphenylene ether [19]. Dispersion of PE in polycarbonate improves melt flow and energy absorption for automotive applications [19], so PC producers offer such grades commercially [35] fine stable polyethylene domains may be produced by adding PE-PS or SEBS block copolymers [36,37]. 

Agari Y, Ueda A, Nagai S (1992) Thermal conductivity of polyethylene/polystyrene blends containing SEBS block copolymer. J Appl Polym Sci 45 1957-1966... 

Toughening Efficiency of Maleated Styrene-Ethylene/ Butylene-Styrene (M-SEBS) Block Copolymer Rubbers... 

SBS and SEBS block copolymers have been employed to impact modify HIPS, PPO/HIPS and various polyolefins. Maleic anhydride modified SEBS offers impact modification of polyamides and polyesters via reactive compatibilization. Chlorinated polyethylene (< 42 wt% Cl) is employed as an impact modifier for PVC, where weatherability is a primary concern [121]. Ethylene-(meth)acrylic acid copolymers and their neutralized versions (ionomers) have been utilized as impact modifiers for polyamides. PBT and PET impact modification with the poly(ester-ether block copolymer) (PBT-poly(tetramethylene oxide) (AB) ) yielded utility in automotive fascia applications. These products have been available under the tradenames Lomod (GE), Bexloy (duPont) andRiteflex (Hoechst-Celanese) [3]. 

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