共聚物
位阻效应
材料科学
聚合物
聚苯乙烯
共价键
高分子化学
块(置换群论)
结晶学
化学
复合材料
立体化学
有机化学
几何学
数学
作者
Jin Wang,Yunchao Zhang,Feihong Ye,Xiaoli Liu,Xianlin Wang,Xinhui Zhou,Yunqing Lu
摘要
Abstract Incorporation of polymer chains into metal–organic frameworks (MOFs) is a simple yet efficient method for improving the orientation of the polymer chains. However, due to their rigidity and high molecular weight, many rigid polymer chains are either not easily loaded into MOFs, or not easily aligned within the MOF channels. In this paper, we propose a strategy for enhancing the orientation of rigid blocks by incorporating rod–coil block copolymer chains into MOFs. In this strategy, on the one hand, the rigid blocks have a low molecular weight, so that the steric hindrance effect from the MOF channels could align the rigid blocks more efficiently. On the other hand, because the covalent bonds between the repeat units of the flexible blocks can rotate relatively easily, the steric hindrance effect from the flexible blocks can further help the rigid blocks to be oriented within the MOF channels. In confirmatory simulations, two all‐atom MOF models, [Zn 2 (BDC) 2 (TED)] n and [Zn 2 (BPDC) 2 (TED)] n (TED = triethylenediamine, BDC = 1,4‐benzenedicarboxylate, BPDC = 4,4′‐biphenyldicarboxylate), are established. With these MOF models, molecular dynamics simulations are performed for the rigid poly(phenylene vinylene) (PPV) chain and the rod–coil block copolymer PPV‐ block ‐polystyrene (PSt). Further, their respective degrees of orientation (DoOs) are calculated. Within [Zn 2 (BDC) 2 (TED)] n and [Zn 2 (BPDC) 2 (TED)] n , the DoOs of the rigid PPV blocks of PPV‐ block ‐PSt are 0.968 and 0.902, respectively, while the DoOs of the rigid PPV chains are 0.865 and 0.711, respectively. These calculation results prove the feasibility of our proposed strategy. © 2019 Society of Chemical Industry
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