2019 Volume 76 Issue 4 Pages 335-340
The influence of added divinylbenzene (DVB) cross-linked particles, having a diameter of 3 µm and 30 µm, on the lamellar microphase-separated structure of styrene-1,4-rich-isoprene (SI) diblock copolymer is investigated. The DVB particles readily sedimented in toluene solution of SI due to low dispersibility, therefore the particles were localized in the lower part of the solvent-cast films. The lamellar structure, formed in the process, exhibited preferential orientation along the direction parallel to the film surface, and the domain spacing along the perpendicular direction was lower than in the parallel direction. The degree of preferential lamellar orientation was lowered by adding the DVB particles, leading to an increment in the domain spacing. Furthermore, the DVB particles with larger diameter gave lower domain spacing, though they produced a lower degree of lamellar orientation.
