Lamellar morphology poly

Morphology of the anionically synthesized triblock copolymers of polyfp-methyl-styrene) and PDMS and their derivatives obtained by the selective chlorination of the hard segments were investigated by TEM 146). Samples with low PDMS content (12%) showed spherical domains of PDMS in a poly(p-methylstyrene) matrix. Samples with nearly equimolar composition showed a continuous lamellar morphology. In both cases the domain structure was very fine, indicating sharp interfaces. Domain sizes were estimated to be of the order of 50-300 A. 

Tao C, Zheng S, Mohwald H, Li J (2003) CdS crystal growth of lamellar morphology within templates of poly electrolyte/surf actant complex. Langmuir 19(21) 9039-9042... 

The main interest of this work concerns the question whether the reaction conditions can also be applied to the block copolymers. The experiments showed that no modifications of the reaction conditions had to be made. Two polystyrene-block-1,2-poly butadiene with a PS/PB ration of 89/11 and a molecular weight of55 000 g/mol for PSPB I and 118 000 g/mol for PSPBII were used as starting materials. High conversion as well as no change in polydispersity is found for both polymers (Table I). This ratio will lead to a lamellar morphology of the block copolymers if phase separation occurs. 

The cross-linking of poly(oxyethylenes) with polymerizable, hydrophobic endgroups within oriented lamellar phases of the ternary system f iz s/de-cane/water was reported by Meier [73]. After cross-linking oriented polymer gels were obtained that retained their lamellar morphology after extraction of the template, and which showed one-dimensional swelHng by water. 

Stadler s work in the field of linear ABC triblock copolymers based on polystyrene (S), polybutadiene (B), and poly(methyl methacrylate) (M) led to the discovery of a number of new morphologies (110-113,127-130). The initial studies dealt with systems where the volume fractions of the outer blocks, 4>s and m, were kept approximately equal. However, in contrast to Matsushita s work, the volume fraction of the outer blocks were kept large while b was decreased, and only lamellar morphologies were obtained, where between the S and M lamellae B spheres (Is), B cylinders (Ic), or a B lamella (11) was embedded with increasing 0B (Fig. 14). 

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