Gyroid Structures at Highly Asymmetric Volume Fractions by Blending of ABC Triblock Terpolymer and AB Diblock Copolymer | Zendy

Seonghyeon Ahn | Zendy; Jongheon Kwak | Zendy; Chungryong Choi | Zendy; Yeseong Seo | Zendy; Jin Kon Kim | Zendy; Byeongdu Lee | Zendy

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Gyroid Structures at Highly Asymmetric Volume Fractions by Blending of ABC Triblock Terpolymer and AB Diblock Copolymer

Author(s) -

Seonghyeon Ahn,

Jongheon Kwak,

Chungryong Choi,

Yeseong Seo,

Jin Kon Kim,

Byeongdu Lee

Publication year - 2017

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/acs.macromol.7b01734

Subject(s) - gyroid , copolymer , materials science , polystyrene , transmission electron microscopy , tetragonal crystal system , polymer chemistry , morphology (biology) , crystallography , composite material , polymer , nanotechnology , chemistry , crystal structure , biology , genetics

We investigated, via small-angle X-ray scattering and transmission electron microscopy, the morphologies of binary blend of polyisoprene-b-polystyrene-b-poly(2-vinylpyridine) (ISP) triblock terpolymer and polyisoprene-b-polystyrene (IS) diblock copolymer. An asymmetric ISP with volume fractions (f) of 0.12, 0.75, and 0.13 for PI, PS, and P2VP blocks, respectively, showed a new morphology: coexistence of spheres and cylinders with tetragonal packing. Asymmetric IS with fI = 0.11 and fS = 0.89 showed conventional body-centered cubic spherical microdomains. Very interestingly, a binary blend of ISP and IS with overall volume fractions of fI = 0.12, fS = 0.79, and fP = 0.09 exhibited core–shell double gyroid (CSG: Q230 space group), where PI consists of thin core and PS forms thick shell, while P2VP becomes thin matrix. It is very unusual to form CSG even at highly asymmetric volume fractions.

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