Effect of Stretching on the Structure of Cylinder- and Sphere-Forming Styrene―Isoprene―Styrene Block Copolymers

摘要: Two styrene−isoprene−styrene block copolymers Vector 4111 and 4113, exhibiting cylindrical (18 wt % PS) spherical (16 morphology, respectively, have been examined under uniaxial elongation up to 200% strain. On the basis of stress−strain data, mechanical properties are compared for isotropic oriented polystyrene domains. The structure at various stages deformation has determined from SAXS patterns in three planes two principal directions with respect orientation. Samples showed a very high degree hexagonal packing, resulting an X-ray pattern taken parallel cylinder alignment approaching single crystal ordering. Cylinders were aligned closest packed film surface. Particular attention paid lattice process occurring during first stretching relaxation cycle. For copolymer morphology was affine 120% microdomain spacing calculate...