3/17/2024 0 Comments Xf and qf integrator functionSelf-Assembly of Semiflexible-Coil Chiral Block Copolymers under Various Segregation Strengths with Multiple Secondary Interactions. Kai-Chieh Yang, Po-Ting Chiu, Hsiu-Wen Tsai, Rong-Ming Ho.This article is cited by 116 publications. A slight increase in f PS, by blending with PS homopolymer, led to a dramatic change in the BCP morphology, and uniform tetragonal perforations were observed at f PMPCS ≈ 0.48. The “onset” of perforation was also observed in real space in sample PS 272- b-PMPCS 93 ( f PMPCS ≈ 0.52), in which few PS chains punctuate PMPCS layers. The perforation obeys a tetragonal instead of hexagonal symmetry. This substantial phase boundary shift was attributed to the rod−coil nature of the BCP. Differential scanning calorimetry (DSC), polarized light microscopy (PLM), small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD), and transmission electron microscopy (TEM) techniques were used to investigate these rod−coil molecules, and a perforated layer structure was observed at f PMPCS ≈ 0.37 in relatively low molecular weight ( M w) samples and ∼0.5 in high M w PS- b-PMPCS. PMPCS forms rigid rods while PS forms the coil block. We report a novel observation of the tetragonal perforated layer structures in a series of rod−coil liquid crystalline block copolymers (BCPs), poly(styrene- block-(2,5-bisoxycarbonyl)styrene) (PS- b-PMPCS).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |