An ordered bicontinuous double-diamond (OBDD) morphology was found in polystyrene-block-(poly-4-vinylphenyldimethylvinylsilane-graft-polyisoprene), PS-b-(PVS-g-PI), block–graft copolymer. We obtained a 3D image of the microdomain structure formed in PS-b-(PVS-g-PI) using 3D-TEM. The 3D image shows that the polystyrene (PS) phase consists of two independent and interwoven networks. The structures of the two networks are identical and include tetrapod units that form planar six-membered rings. The features of the networks agree with those in the OBDD morphology, indicating that PS-b-(PVS-g-PI) exhibits ordered three-dimensional OBDD networks with the PS phase in the polyisoprene (PI) matrix phase. The grafted PI chains induce the frustration of the PS chains; thus, the effects of the specific interface are more dominant than those of packing frustration in the formation of the morphology, and the OBDD phase is stabilized.

中文翻译：

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新型双连续微区结构的3D-TEM研究

在聚苯乙烯嵌段-（聚-4-乙烯基苯基二甲基乙烯基硅烷-接枝-聚异戊二烯），PS- b-（PVS- g -PI），嵌段接枝共聚物中发现有序的双连续双金刚石（OBDD）形态。我们使用3D-TEM获得了在PS- b-（PVS- g -PI）中形成的微区结构的3D图像。3D图像显示，聚苯乙烯（PS）相由两个独立且交织的网络组成。这两个网络的结构是相同的，并且包括形成平面六元环的四脚架单元。网络的特征与OBDD形态中的特征一致，表明PS- b-（PVS- g-PI）展示有序三维OBDD网络，其中PS相处于聚异戊二烯（PI）基质相。嫁接的PI链导致PS链受挫。因此，在形貌的形成中，特定界面的影响比填塞挫折的影响更为显着，并且OBDD相得以稳定。