Topology Effect on Order-Disorder Transition of High-χ Block Copolymers.

ABSTRACT: This work aims to systematically examine the topology effect on the self-assembly of block copolymers. Compositionally, symmetric polystyrene-block-polydimethylsiloxane block copolymers (BCPs) with different chain topologies (diblock, three-arm star-block, and four-arm star-block) and various molecular weights are synthesized. These purposely designed block copolymers are used as a model system to investigate the topology effect on order-to-disorder transition temperature (T _ODT) by temperature-resolved small-angle X-ray scattering experiments. An increase of the T _ODT is observed when the arm number of BCPs with equivalent arm length (i.e., molecular weight) is increased from one to four. Based on the random-phase approximation (RPA), Flory-Huggi

SUBMITTER: Chang CY 

PROVIDER: S-EPMC11325650 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature