Polyisoprene, block copolymer

Figure 6.1 Cylindrical micelles of a poly(ferrocenyldimethylsilane)/poly(dimethylsiloxane) or polyisoprene block copolymer showing the central core of the ferrocenylsilane units and the corona of the organic polymer blocks. Reproduced by permission of Prof. I. Manners.

In an investigation of the effect of chain geometry on the two phase morphology of polystyrene-polyisoprene block copolymers, Price et al. have studied films of AB linear, AB stars with 2,3 or 4 branches196,197), graft copolymers 198 200>, and ABC block terpolymers201. ... 

Ren, J., SUva, A. S., and Krishnamoorti, R., Linear viscoelasticity of disordered polystyrene-polyisoprene block copolymer based layered-silicate nanocomposites. Macromolecules, 33, 3739-3746 (2000). 

Armes, S. P, Vincent, B., and White, J. W., A novel route for producing soluble polyacetylene-polyisoprene block copolymers, J. Chem. Soc. Chem. Commun., 28, 1525-1527 (1986). 

PS-b-PI polystyrene/polyisoprene block copolymer VA vinyl acetate... 

Minatti, E., Borsali, R., Schappacher, M. et al. (2002) Effect of cyclization of polystyrene/polyisoprene block copolymers on their micellar morphology. Macromolecular Rapid Communications, 23,978-982. 

Patel SS, Larson RG, Winey KI, Watanabe H (1995) Shear orientation and rheology of a lamellar polystyrene-polyisoprene block copolymer. Macromolecules 28 4313-4318... 

Figure 1.9 Electron micrograph showing macrophase separation of domains of microphase-separated polystyrene- >-polyisoprene block copolymer (Mj, = lOOkgmor, /ps = 0.46) in a PS homopolymer (Mn = SSOkgmor ) matrix (Reproduced from S. Koizumi et al. Macromolecules 27, 6532 (1994) Copyright (1994) with permission from the American Chemical Society.)...

Figure 4 Contrast is visible without staining in a film of polystyrene-polyisoprene block copolymer with 50% of each component present. The polystyrene lamellae appear darker than the polyisoprene due to density differences. Micrograph courtesy of AJ Ryan and C Salou (University of Sheffield).

Figure C2.1.11. Morjrhologies of a microphase-separated di-block copolymer as function of tire volume fraction of one component. The values here refer to a polystyrene-polyisoprene di-block copolymer and ( )pg is tire volume fraction of the polystyrene blocks. OBDD denotes tire ordered bicontinuous double diamond stmcture. (Figure from [78], reprinted by pemrission of Annual Reviews.)...

Other Uses. Large quantities of hydrocarbon resins are used in mastics, caulks, and sealants (qv). Polymers for these adhesive products include neoprene, butyl mbber, polyisoprene, NR, SBR, polyisobutylene, acryHcs, polyesters, polyamides, amorphous polypropylene, and block copolymers. These adhesives may be solvent or water-borne and usually contain inorganic fillers. 

Fig. 2. To and We for isomers of polybutadiene and polyisoprene, and for typical average isomeric compositions in styrenic block copolymers.

Figures 7 and 8 show the original morphologies of the block copolymers observed by TEM selectively stained P4VP, P2VP, and polyisoprene (PIP) sequences...

Measurements of diffusion of tracer polymers in ordered block copolymer fluids is another potentially informative activity, since molecular diffusion is one of the most basic dynamic characteristics of a molecule. Balsara, et al. have measured the retardation of diffusion due to ordering in the diffusion of polystyrene tracer homopolymers in polystyrene-polyisoprene matrices of various domain sizes [167]. Measurement of the tracer diffusion of block copolymer molecules will also be important. Several interesting issues are directly addressable via measurements... 

In a similar manner polyisoprene-polyethylene oxide block copolymers can prepared301. It is surprising that the poly(methyl methacrylate) anion can be successfully used for the polymerization of ethylene oxide without chain transfer302. Graft copolymers are also prepared by successive addition of ethylene oxide to the poly-... 

LeiblerL., Theory of microphase separation in block copolymers. Macromolecules, 13, 1602, 1980. Eoerster S., Khandpur A.K., Zhao J., Bates E.S., Hamley I.W., Ryan A.J., and Bras W. Complex phase behavior of polyisoprene-polystyrene diblock copolymers near the order-disorder transition. Macromolecules, 21, 6922, 1994. 

Inoue T., Soen T., Hashimoto T., and Kawai, H. Studies on domain formation of the A-B t3fpe block copolymer with polystyrene and polyisoprene. Macromolecules, 13, 87, 1970. 

In this study, the effects of the variations in block sequence and composition (and thus relative block length) on the material properties of two series of triblock copolymers has been investigated. One of the blocks, the hydrogenated polybutadiene (HB), is semicrystalline, and the other block, the hydrogenated polyisoprene (HI) is rubbery at room temperature. Thus in one series, the HBIB block copolymers, the end blocks are semi-... 

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