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 f_I = 0.11 and f_S = 0.89 showed conventional body-centered cubic spherical microdomains. Very interestingly, a binary blend of ISP and IS with overall volume fractions of f_I = 0.12, f_S = 0.79, and f_P = 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.

中文翻译：

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通过ABC三嵌段三元共聚物和AB二嵌段共聚物的共混物，在高度不对称体积分数下的陀螺结构

我们通过小角度X射线散射和透射电子显微镜研究了聚异戊二烯-b-聚苯乙烯-b-聚（2-乙烯基吡啶）（ISP）三嵌段三元共聚物和聚异戊二烯-b-聚苯乙烯（IS）的二元共混物的形态二嵌段共聚物。不对称ISP的PI，PS和P2VP块的体积分数（f）分别为0.12、0.75和0.13，显示出一种新的形态：球形和圆柱体与四方堆积并存。f _I = 0.11和f _S = 0.89的不对称IS显示了常规的以人体为中心的立方球形微域。非常有趣的是，ISP和IS的二元混合体的总体积分数为f_I = 0.12，f _S = 0.79，f _P = 0.09表现出核-壳双螺旋形（CSG：Q ²³⁰空间群），其中PI由薄核组成，PS形成厚壳，而P2VP变成薄基质。即使在高度不对称的体积分数下，形成CSG也是非常不寻常的。