Poly -Wock-polystyren

Kim JK, Lee HH, Sakurai S, Aida S, Masamoto J, Nomura S, Kitagawa Y, Suda Y (1999) Lattice disordering and domain dissolution tiansitions in polystyrene-Wock-poly(ethylene-co-but-l-ene)-Wock-polystyrene copolymer having a highly asymmetric composition. Macromolecules 32 6707-6717... 

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],... 

Polystyrene-Wock-poly(2-cinnamoylethyl methacrylate) Adsorption Reactions of Poly(methyl methacrylate)... 

Fig. 16. Correlation of S in mL of sorbed liquid per gram of poly(Sty-Wock-DVB) (prepared via anion polymerization by Rempp [143] in 1970) with the corresponding calculated cube root of the number of backbone carbon atoms in the polystyrene segments between nodules of DVB...

Other multifunctional initiators include star polymers prepared from initiators via living radical or other living polymerizations. In particular, all of the star polymers via metal-catalyzed living polymerization, by definition, carry a halogen initiating site at the end of each arm, and thus they are potentially all initiators. Thus, star-block copolymers with three polyisobutylene-Mock-PMMA arms and four poly-(THF) -A/oc/F polystyrene or poly(THF)-Woc/c-polysty-rene-Wock-PMMA were synthesized via combination of living cationic and copper-catalyzed living radical polymerizations.381,388 Anionically synthesized star polymers of e-caprolactone and ethylene oxide have... 

Fig. 14 a, b Chemical structures of a poly (ethylene glycol)-Wock-poly(a, P-aspartate) (PEG- -PAsp) and polyethylene glycol)-Wock-poly(a, P-aspartamide) (PEG-b-PAspA), b poly (ethylene oxide)-Wocfc-polystyrene-protoporphyrin IX (PEO- -PS-PPIXZn) and crystal structure of horse radish peroxidase (HRP) the arrow marks the positioning of the cofactor... 

Manipulating the location of nanoparticles in the materials can also be achieved by controlling the surface properties of the nanoparticles. By using enthalpic interactions, Kramer and coworkers found that gold nanoparticles covered with sufficient thiol-terminated PS ligands are held inside the PS microdomains in polystyrene-Wock-poly(2-vinyl-piridine) (PS-/>P2VP) copolymers, whereas gold nanoparticles... 

The first proof of the validity of this approach was given by Gankina et al. [19] for the analysis of block copolymers by thin layer chromatography. Column liquid chromatography was used by Zimina et al. [20] for the analysis of poly(styrene-b/ock-methyl methacrylate) and poly(styrene-Wock-terr-butyl methacrylate). However, the critical conditions were established only for the polar part of the block copolymers, i.e. PMMA and PtBMA, respectively. Thus, only the polystyrene block was analyzed. 

Block copolymers in solution can be self-assembled into a variety of architectures. Micelles are common self-assembled stmctures formed by block copolymers when dissolved in a selective solvent , which is a good solvent for one of the polymer blocks but a poor solvent for the blocks of the other polymer. Binding one of the copolymer blocks with inorganic moieties leads to the formation of nucelles. The inorganic moieties are localized within the core of the micelles and coated with a thin shell of the other copolymer blocks. For example, Taton s group prepared a unidirectional structure of hybrid nucelles based on amphiphilic polystyrene-Wock-poly(acrylic acid) (PS-h-PAA) and gold nanoparticles (AuNPs) (Fig. 1) [25]. 

Yu K, Eisenberg A (1996) Multiple morphologies in aqueous solutions of aggregates of polystyrene-Wock-poly(ethylene oxide) diblock copolymers. Macromolecules 29 6359-6361... 

Milnera M, Stepmek M, Zuskova I, Prochazka K (2007) Experimental study of the electrophoretic mobility and effective electric charge of polystyrene-Wock-poly(methacrylic acid) micelles in aqueous media. Int J Polym Anal Charact 12 23-33... 

Gohy J-F, Willet N, Varshney SK, Zhang J-X, J ome R (2002) pH dependence of the morphology of aqueous micelles formed by polystyrene-Wock-poly(2-vinylp5fridine)-Wt)ck-poly(ethylene oxide) copolymers. e-Polymers (35) l-IO... 

Recently, we reported the ordering kinetics between HEX and BCC microdomains for polystyrene-Wock-polyisoprene-6/ocifc polys ene (SIS) copolymer (13). In ref (13), we employed an as-cast sample that was not aligned in a macroscopic scale. In this situation a small angle X-ray scatto-ing with one-dimensional detector (1-D SAXS) could be employed to study the ordering kinetics because of the random orientations of grains in the block copolymer. Also, in a separate paper we have shown that during the transition... 

Since this fluorescent labeling methodology is a living functionalization reaction, the resulting living fluorescent-labeled polymers can be used to initiate the polymerization of a second monomer to produce a block copolymer with the label at the block interface as discussed previously. For example, this procedure has been used to prepare polystyrene-Wock-poly(ethylene oxide) copolymers with both pyrene (60) (see Scheme 23) and naphthalene fluorescent groups at the interface between the two blocks [180-182]. Lithium was used as the counterion to prepare well-defined, quantitatively-ethylene oxide-functionalized polystyrenes in benzene solution [183]. However, under these conditions, it is not possible to polymerize ethylene oxide [183]. Therefore, it was necessary to add either dimethylsulfoxide [180, 181] or a potassium alkoxide [182] to promote ethylene oxide block formation as shown in Scheme 23. These diblock copolymers were fractionated to obtain pure diblock copolymer... 

The generality and efficiency of this fluorescent-labeling methodology has been demonstrated by preparation of polystyrene-Wock-poly(ferf-butyl acrylate) [186] and polystyrene-fjlock-polyfmethyl methacrylate) [187] diblock copolymers with fluorescent groups at the block junctions. 

Ryu DY, Jeong U, Lee DH, Kim J, Youn HS, Kim JK (2003) Phase behavior of deuterated polystyrene-Wock-poly(n-penyl methacrylate) copolymers. Macromolecules 36 2894-2902... 

Zha W, Han CD, Le DH, Han SH, Kim JK, Kang JH, Park C (2007) Origin of the difference in order-disorder transition temperature between polystyrene-Wock-poly(2-vinylpyridine) and polystyrene-b/ock-poly(4-vinylpyiidine) copolymers Macromolecules 40 2109-2119... 

Figure 8 Moiphological transitions of polystyrene-Woc -polybutadiene-Woc r-poly(methyl methacrylate) triblock terpolymers (SBM) by hydrogenation into polystyrene-Wock-poly(ethylene-co-butylene)-Woc/r-poly(methyl methacrylate) triblock terpolymers (SEBM) The subscript numbers indicate weight fractions, while superscript numbers indicate the totai moiecular weight in kg mol" . The color code is according to the contrasts obtained by TEM. SBM is stained with OSO4 PS (gray), PB (dark), PMMA (white) SEBM is stained with RUO4 PS (dark), PEB (gray), PMMA (white). Reprinted with permission from Abetz, V. In Encyclopedia of Polymer Science and Technology, 3rd ed. Kroschwitz, J. I., Ed. John Wiley Sons, inc. New York, 2002 Voi. 1, pp 482-523. ...

Figure 32 Crystallization kinetics for the poly(ethylene oxide) block in triblock terpolymers with a rubbery end biock (poiybutadiene-Wocfr-polystyrene-b/oc/f-poly(ethylene oxide)) or a crystalline end block (polyethylene-b/oc/f-polystyrene-Wock -poiy(ethylene oxide)) (a) deveiopment of the relative crystallinity with crystallization time during isothermal crystallization at 49.5 °C, and (b) inverse of experimentai crystaiiization haif-time as a function of crystallization temperature. Reprinted with permission from Boschetti-de-Fierro, A. etal. Macromol. Chem. Phys. 2008,209,476- 87. ...

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