Poly styrene-b-isoprene

The poly(styrene-b-isoprene) (P(S-b-IP)) and poly(-styrene-b-2-vinyl pyridine) (P(S-b-2VP)) block copolymers with narrow molecular weight distributions for blending with the microspheres were also synthesized using the additional anionic polymerization technique. The number-average molecular weights (Mns) and PS contents are also shown in Table 1. 

Non-aqueous (or-oil-in-oil) emulsions, where the phases are two immiscible organic liquids, have received relatively little attention in the literature. Riess et al. [116-119] have studied the stabilisation of waterless systems with block and graft copolymers, where one of the liquids is a good solvent for one of the blocks and a non-solvent for the other, and vice versa. Thus, poly(styrene-b-methylmethacrylate) copolymers could emulsify acetonitrile/cyclohexane mixtures, and poly(styrene-b-isoprene) was effective for DMF/hexane systems [116]. These, however, are not HIPE systems. 

Huang Cl et al (1998) Quantifying the neutrality of good solvents for block copolymers poly(styrene-b-isoprene) in toluene, benzene, and THF. Macromolecules 31(26) 9384-9386... 

Bang J, Jain SM et al (2006) Sphere, cylinder, and vesicle nanoaggregates in poly (styrene-b-isoprene) diblock copolymer solutions. Macromolecules 39 1199-1208... 

Kawai and Inoue (49) recently explored the mechanical blend of poly-styrene/polyisoprene/poly(styrene-b-isoprene) polymer 1 and polymer 2 appear as both homopolymers and block components. 

The stability ranges of the different structures can be represented in a phase diagram as shown in Fig. 7 for the system poly(styrene-b-isoprene) (PS-PI) [32,33]. 

Systems where the interaction between the end blocks is intermediate, the interactions between the adjacent blocks form stractures between those observed in the type II frustrated and the nonfrustrated systems. Stractures observed include alternating spheres on a BCC lattice, core-shell gyroid, core-shell cylinders, perforated lamellar, and pillared lamellar. Examples of such experimental systems are poly(styrene-b-isoprene-b-ethylene oxide),poly(styrene-b-butadiene-b-2-vinylpyridine) poly(styrene-b-isoprene-b-2-vinylpyri-... 

Fig. 10.9 Reflectance (blue) and transmission (yellow) measurements of poly(styrene-b-isoprene) block copolymer with molecular weights as shown...

Fig. 10.10 TEM micrograph of poly(styrene-b-isoprene) cast from a 1 % solution in dichloromethane. The red scale bars indicate 2 pm (left) and 0.5 pm (right)...

Second virial coefficient of poly(styrene-b-isoprene)... 

---