Polystyrene block

Polystyrene-6Zoc -poly(ethylene-butylene)-block- polystyrene, 7 647 Polystyrene-Woe/ -poly(> .-butyl acrylate), 7 646... 

Kim, J., Kim, B. and Jung, B. 2002. Proton conductivities and methanol permeabilities of membranes made from partially sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene copolymers. Journal of Membrane Science 207 129-137. 

E7 polystyrene-Z)/oc - silanetetraylbis[-gra/i-poly(buta-1,3-diene)] -block-polystyrene, or poly(buta-l,3-diene)-Z)/oc -[silanetetraylbis(-gra/ polystyrene)]-Z)/ocyi -poly(buta-l,3-diene)... 

The purpose of this contribution is to show how the design of a new dianionic species can lead to interesting advances in block copolymerization and especially to original PA(P0)2 starshaped block copolymers. PA is a hydrophobic block polystyrene, polytertiarybutylstyrene (PTBS) or polyisoprene (Pi). The surface activity of this novel and well mastered molecular architecture is considered and compared as far as possible with the behavior of the corresponding PA-PO diblock copolymers. 

SBM) as a compatibilizer. As a result of the particular thermodynamic interaction between the relevant blocks and the blend components, a discontinuous and nanoscale distribution of the elastomer at the interface, the so-called raspberry morphology, is observed (Fig. 15). Similar morphologies have also been observed when using triblock terpolymers with hydrogenated middle blocks (polystyrene-W<9ck-poly(ethylene-C0-butylene)-Wock-poly(methyl methacrylate), SEBM). It is this discontinuous interfacial coverage by the elastomer as compared to a continuous layer which allows one to minimize the loss in modulus and to ensure toughening of the PPE/SAN blend [69],... 

The carbanion pump method has been successfully applied for the preparation of different block copolymers including poly(ethylene oxide)-block-polystyrene, poly(ethylene oxide)-block-polystyrene-block-poly(ethylene oxide), poly(ethylene oxide)-block-poly(methyl methacrylate), poly(ethylene oxide)-block-poly(methylmethacry-late)-block-poly(ethylene oxide) (shown in Scheme 14), and poly(ferrocenyldimethylsilane)-block-(methyl methacrylate) <2004MI856, 2004MM1720, 2006MI(928)292>. 

Bieringer et al. [74] studied poly(5-(N,N-dimethylamino)isoprene)-block-polystyrene-block-poly(methacrylic acid) (AiSA) triblock copolyam-... 

So far, there have been only few reports about the synthesis of amphipolar polymer brushes, i.e. with amphiphilic block copolymer side chains. Gna-nou et al. [115] first reported the ROMP of norbornenoyl-endfunctionalized polystyrene-f -poly(ethylene oxide) macromonomers. Due to the low degree of polymerization, the polymacromonomer adopted a star-like rather than a cylindrical shape. Schmidt et al. [123] synthesized amphipolar cylindrical brushes with poly(2-vinylpyridine)-block-polystyrene side chains via radical polymerization of the corresponding block macromonomer. A similar polymer brush with poly(a-methylstyrene)-Wocfc-poly(2-vinylpyridine) side chains was also synthesized by Ishizu et al. via radical polymerization [124]. Using the grafting from approach, Muller et al. [121, 125] synthesized... 

The study of sets of copolymers with a type of block (polystyrene, or polybutadiene) of constant molecular weight and the other of variable molecular weight has shown that, within the stability region for a given structure, the conformation of... 

For the LC structure, each elementary sheet results from the superposition of two layers a layer of thickness dA formed by the solvated amorphous block (polystyrene or polybutadiene) and a layer of thickness dB formed by the crystalline and folded chains (polyethylene oxide) or polycaprolactone)265,269,271 ... 

Thus a statistical copolymer of ethylene and propyiene is named poly(ethylene-stef-propylene), and an ABA tri-block copolymer of styrene (A) and isoprene (B) is named polystyrene-block-polyisoprene-block-polystyrene. In certain cases, additional square brackets are required. For example, an alternating, copolymer of styrene and maleic anhydride is named poly[styrene-d/f-(maleic anhydride)]. 

Yoshida E, Kunugi S (2002) Micelle formation of poly(vinyl phenol)-block-polystyrene by alpha, omega-diamines. J Polym Sci A Polym Chem 40 3063-3067... 

Blends of syndiotactic styrene-/ -methylstyrene copolymers (SPMS) with poly(styrene)-block-poly(ethylene-co-butylene)-block-polystyrene (SEBS) has been reported. [21] No significant effects on the tensile modulus and strength were observed for blends containing less than 10% SEBS. SEM of drawn samples of the blends showed that the dispersed SEBS phase had been extended to about the same extent as the bulk blend, indicating good adhesion between the two phases. 

Several other diblock and triblock copolymers have been synthesised, although these are of limited commercial availability [7]. Typical examples are diblocks of polystyrene-block-PVA, triblocks of poly(methyl methacrylate)-block PEO-block poly(methyl methacrylate), diblocks of polystyrene block-PEO, andtriblocks of PEO-block polystyrene-PEO. An alternative - and perhaps more efficient - polymeric... 

A potential advantage of such a transformation reaction (8) is that at least the first block (polystyrene) can be synthesized with a well-defined chain length. Different approaches to grafts and blocks based on termination of acetylene polymerization by appropriate carrier polymers have recently been reported (9). 

In this notation A and B can represent different stereo configurations, or microstructures of the same mer. Likewise, either A and/or B may be random or tapered copolymer blocks rather than homopolymeric blocks. A tapered A-B block is one that begins with a section of pure A mers and gradually incorporates B mers until at the end it becomes a section of pure B mers. The A-B-C designation represents the incorporation of a third monomer segment and would most probably comprise a three-phase system. An A-B-A block polymer based on styrene and butadiene would mean in this notation a polystyrene block-polybutadiene block-polystyrene block structure, that is, S-B-S. 

Polymers exhibit the fractality inherent in them at different structural levels both primary and secondary structural elements can be fractals. For example, macromolecular coils in 0 or in good solvents with df 1.66 (with the Euclidean dimension = 3) are fractals [1,29]. The fractality of a polymer at the molecular level can be demonstrated as follows. Lebedev [90] reported data on the change in the radius of gyration Rf) of the macromolecules of block polystyrene, PMMA and polyethylene with the molecular mass M. The Rg value is related to the length of a macromolecule in the following way [91] ... 

Liu F, Eisenberg A (2003) Preparation and pH triggered inversion of vesicles from poly(acrylic acid)-block-polystyrene-block-poly(4-vinyl pyridine). J Am Chem Soc 125 15059-15064... 

Stenert, M., Doring, A., and Bandermann, F. 2004. Poly(methyl methacrylate)-block-polystyrene and polystyrene-block-poly( -butyl acrylate) as compatibihzers in PMMA/PNBA blends, e-Poly-mers 15,1-16. 

Wilczek-Vera, G., Yu, Y, Waddell, K., Danis, R O., and Eisenberg, A., Analysis of Diblock Copolymers of Poly(a-methylstyrene)-block-polystyrene by Mass Spectrometry, 32, 2180, 1999. 

A Nykaenen, M. Nuopponen, A Laukkanen, S. P. Hirvonen, M. R3d ela, 0. Tlirunen, H. Tenhu, R Mezzenga, 0. Ikkala, and J. Ruokolainen, Thase Behaviour and Temperature-Responsive Molecular Filters Based on Self-Assembly of Polystyrne-Block-Poly(n-Isopropylacrylamide)-Block Polystyrene," Macromolecules. 40, 5827-5834(2007). 

Polystyrene/acrylonitrile. See Styrene/acrylonitrile copolymer Polystyrene benzyltrimethylaminonium chloride. See Cholestyramine Polystyrene-block-poly (ethylene-ran-butylene)-block-polystyrene. See Styrene-ethylene/butylene-styrene block copolymer Polystyrene, brominated CAS 88497-56-7... 

Synonyms S-EB-S Polystyrene-block-poly (ethylene-ran-butylene)-block-polystyrene SEBS copolymer... 

Several non-fluorinated alternative polymers have been proposed for DAFC, mainly based on sulfonated ionomers with an aromatic or aliphatic hydrocarbon skeleton [7], Kim and Pivovar [4] have reported the number of DMFC alternative membranes papers appearing in open hterature for years 1994—2004, showing that polyarylenes, polyvinyl alcohols, grafted and block polystyrenes copolymers, and polyimides were among the most studies polymer electrolytes. In view of the dramatic increase in the number of publications since 2005 (see Fig. 6.1), the trends have changed, as shown in Table 6.1, which sununaiized the publications in open literature for the period 2005-2012, as compared to the previous period. 

Zeng QH, Liu QL, Broadwell I, Zhu AM, Xiong Y, Tu XP (2010) Anion exchange membranes based on quatemized polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene for direct methanol alkaline fuel cells. J Membr Sci 349 237-243... 

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