Poly -block-polybutadiene

Poly styrene-block -polybutadiene-feZoe/ -polystyrene, 7 608t... 

Poly styrene-block -polybutadiene-feZoc/ -polymethylmethacrylate copolymers, 7 645... 

Krappe U, Stadler R et al (1995) Chiral assembly in amorphous ABC triblock copolymers. Formation of a helical morphology in polystyrene-block-polybutadiene-block-poly(methyl methacrylate) block copolymers. Macromolecules 28 4558 1561... 

A preliminary screening indicated that excellent impact could be obtained using 15-20 wt % butadiene based on the total polymer blend. At 20 wt % butadiene, several block polymers were screened for optimum impact and overall balance of properties. Two-component systems (block polymer-polystyrene) and three-component systems (block poly-mer-polybutadiene-polystyrene) were tried. The impact varied with the styrene content of the block polymer in both two- and three-component systems as shown in Figure 1. Subsequent work showed that the best overall balance of impact, flexural modulus, and heat distortion was obtained at 15% butadiene. 

Only recently first reports appeared describing the potential of the nanostructured thin block copolymer films for lithographic etching. A thin film of polystyrene-block-polybutadiene with a hexagonal cylindrical morphology where the poly-(butadiene) cylinders were oriented perpendicular to the substrate was deposited on a silicon wafer and selectively decomposed by treatment with ozone or converted with osmium tetroxide. By a subsequent reactive ion etching process the pattern could be inscribed into the surface of the silicon wafer yielding small holes or islands with a lattice constant of 27 nm and hole/island sizes of 13 nm [305,312]. 

Schwier, C. E. (1984) Crazing and Large Deformation Behavior in a Model Set of Poly styrene Polybutadiene Di-block Copolymers, Sc.D. Thesis, Massachusetts Institute of Technology, Cambridge, MA. 

Figure 8 Transmission electron micrograph of a polystyrene-block-polybutadiene-block-poly(methyl methacrylate) S-B-M showing the helical morphology. Cylindrical domains of S are surrounded by black stained helices of B. M forms the matrix. The arrow points to a helix reversal. (From U. Krappe et al. Macromolecules 28A558,1995, Copyright 1995 American Chemical Society.)...

Figures Scheme for the change of the morphological behavior of a polystyrene-block-polybutadiene-block-poly(methyl methacrylate) S-B-M induced by hydrogenation of B to poly(ethylene-co-butylene) EB from a lamellar morphology with B spheres or B cylinders between S and M lamellae in an S-B-M triblock terpolymer to a hexagonal morphology, where EB rings surround S cylinders in an M matrix after hydrogenation.

Figure 22 Transmission electron rnicrographs (stained with OSO4). Blends of polystyrene-block-polybutadiene-block-poly(methyl metl crylate) S-B-M with polybutadiene-block-poly(methyl methacrylate) B-M. (a) 40mol% S- M 60mol% B-M, (b) 70mol% S-B-M 30mol% B-M. Blends of polystyrene-block-polybutediene-block-poly(tert.butyl methacrylate) S-B-T with polybutadiene-block-poly(tert. butyl methacrylate) B-T. (c) 40mol% S-B-T 60mol% B-T, (d) 70mol% S-B-T 30 mol% B-T. ...

Figure 24 Periodic noncentrosymmetric lamellar superstructure of a blend of polystyrene-block-polybutadiene-block-poiy(tert.butyl methacrylate) S-B-T with polystyrene-block-poly(tert.butyl methacrylate) S-T with the composition 50 mol% S-B-T 50mol% S-T. (a) Transmission electron micrograph (stained with OSO4), (b) scheme of the characteristic defect proving the periodic noncentrosymmetry. (From T. Goidacker et ai. Wafure 398 137, 1999, Copyright 1999 Macmillan Magazines Ltd.)...

Figure 18.13 TEM images and models of (a) the knitting pattern kp) and (b) barber pattern hoc) in PS-PEB-PMMA. ((a) Reprinted with permission from H. Ott, V. Abetz and V. Altstadt, Morphological studies of poly(styrene)-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) in the composition region of the knitting pattern morphology, Macromolecules, 34, 7, 1069-1075, 2001. 2001 American Chemical Society, (b) Reprinted with permission from U. Krappe, R. Stadler and I. Voigt-Martin, Chiral assembly in amorphous ABC triblock copolymers. Formation of a helical morphology in polystyrene-block-polybutadiene-block-poly(methyl methacrylate) block copolymers, Macromolecules, 28, 13, 4558-4561, 1995. 1995 American Chemical Society.)...

Becktrrann, J., Auschra, C., and Stadler, R. (1994) Ball at the wall - A new lamellar multiphase morphology in a polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock copolymer. Macromolecular Rapid Communication, 15,67-72. 

Figure 9 Polystyrene-block-polybutadiene-block-poly(methyl methacrylate) S-B-M with a B matrix embedding hexagonally packed cylindrical domains of S and M. (a) Transmission electron micrograph stained with OSO4 (b) Scheme of the morphology. (From Ref. 186, Copyright 1998 American Chemical Society.)...

Gao W-P et al. Controlling vesicle formation via interpolymer hydrogen-bonding complexation between poly(ethylene oxide)-block-polybutadiene and poly(acrylic acid) in solution. Macromolecules 2006 39( 14) 4894-4898. 

Several studies have concerned the microstnicture of lamellae in materials such as the block copolymers polystyrene-h/oc/r-poly-l-vinylpyridine [139] and polystyrene-h/oc/r-polybutadiene [140], as well as single crystals of poly-para-xylylene [139], and reveal features (such as intersecting lamellae (figure Bl.19.29)) that had not been previously observed. 

Figure 9.17 Plot of log [i ]M versus retention volume for various polymers, showing how different systems are represented by a single calibration curve when data are represented in this manner. The polymers used include linear and branched polystyrene, poly(methyl methacrylate), poly(vinyl chloride), poly(phenyl siloxane), polybutadiene, and branched, block, and graft copolymers of styrene and methyl methacrylate. [From Z. Grubisec, P. Rempp, and H. Benoit, Polym. Lett. 5 753 (1967), used with permission of Wiley.]...

IBI 1,4-Polyisoprene 1,4-Polybutadiene Poly(ethylene-co- propylene Polyethylene Inverse block polymer— properties dependent on composition... 

S-B,.4 Polystyrene 1,4-Polybutadiene Poly(vinyl cyclohexane) Polyethylene Hydrogenation of both blocks... 

Addition of poly(styrene-block-butadiene) block copolymer to the polystyrene-polybutadiene-styrene ternary system first showed a characteristic decrease in interfacial tension followed by a leveling off. The leveling off is indicative of saturation of the interface by the solubilizing agent. 

Poly(styrene-fc-butadiene) copolymer-clay nanocomposites were prepared from dioctadecyldimethyl ammonium-exchanged MMT via direct melt intercalation [91]. While the identical mixing of copolymer with pristine montmorillonite showed no intercalation, the organoclay expanded from 41 to 46 A, indicating a monolayer intercalation. The nanocomposites showed an increase in storage modulus with increasing loading. In addition, the Tg for the polystyrene block domain increased with clay content, whereas the polybutadiene block Tg remained nearly constant. 

Some work has been done on blends of ABC and AB or AC or AB C block copolymers, such as polystyrene-b-polybutadiene-b-poly(methyl methacrylate) (PS-h-PB-fc-PMMA) triblock terpolymers with PS-h-PB or PB-h-PMMA or other systems. Besides known morphologies for these block copolymers (though at other overall compositions with respect to the different chemical... 

As an example of blends with attractive interactions, Fig. 65 shows a superstructure in which interactions between methacrylic acid groups and pyridine side groups of a polystyrene-fc-polybutadiene-fo-poly(f-butyl methacry-late-staf-methacrylic acid) (PS-b-PB-b-P(MAA-sfaf-fBMA)) triblock quater-polymer and a PS- -P2VP diblock copolymer lead to a wavy lamellar structure with cylinders from mixed P2VP and P(MAA-sfaf-fBMA) blocks [194],... 

For the hydrogenation ofpolystyrene-fo-polybutadiene-fo-polystyrene (SBS) block co-polymer with Ru-TPPTS complex as catalyst, Jang et al. [92] applied a poly-ether-modified ammonium salt ionic liquid/organic biphasic system (Fig. 41.3). 

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