Importance of interfacial mixed layer to determine the middle block Tg in lamellar structures of uncross-linked and cross-linked hard-b-soft-b-hard triblock copolymers

摘要: Abstract We here discuss the importance of interfacial mixed layer on determination middle block Tg (Tg,B) lamellar-forming hard-b-soft-b-hard ABA triblock copolymers. The detailed morphological characterization is first conducted by scattering measurements and model analyses, which provides length fraction B segments (fint,B) existing in to overall chain. By investigating for neat copolymers with various lengths volume fractions A blocks (ϕA), variation Tg,B found have a correlation (fint,B). In later section, discussion related made samples cross-linked domains prepared via photo reaction. this design, original morphology finely retained after cross-linking, thereby enabling extraction pure effects domain cross-linking physical properties. After interestingly, glass transition temperature decreases, especially sample ϕA > 0.5, where reduction degree determined both segmental density fint,B.