Self-assembly of homopolymers through strong dipole–dipole interaction in their aqueous solutions
Self-assembly of homopolymers through strong dipole–dipole interaction in their aqueous solutions
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DOI：
10.1016/j.polymer.2016.05.011
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发表时间：
2016-08
期刊：
影响因子：
4.6
通讯作者：
Yu-Qian Zhou;Bingyang Liu;Xiaogong Wang
中科院分区：
文献类型：
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作者：
Yu-Qian Zhou;Bingyang Liu;Xiaogong Wang
这项研究揭示了偶极-偶极相互作用对均聚物在溶液中形成自组装微球的关键作用。对于不同侧基的聚合物，通过在N，N-二甲基甲酰胺(DMF)溶液中逐渐加入去离子水来诱导自组装。其中三种带有强偶极子的侧基聚合物在该过程中形成了均匀的胶体球体。在超过临界含水率(CWC)后，骨料的尺寸随着含水率的增加先增大后减小，然后形成最终集合体。在中间状态，聚集体具有膨胀形式的微凝胶状结构。另一方面，对于没有偶极侧基的聚合物，则没有观察到这种自组装行为，这种侧基随着水含量的增加而从DMF-H2O溶液中析出。强偶极基团作为缔合基团是避免聚合物分子在相分离后形成致密聚集体和从溶液中析出所必需的。
This study reveals the critical importance of dipole–dipole interaction for homopolymers to form self-assembled microspheres in solutions. For the polymers with different side-groups, the self-assembly is induced by gradually adding deionized water into their solutions inN,N-dimethylformamide (DMF). Three of the polymers containing side-groups with the strong dipoles form uniform colloidal spheres in the processes. Beyond the critical water content (CWC), the aggregate sizes first increase and then decrease with the increasing water content before forming the final assemblies. In the intermediate states, the aggregates possess a microgel-like structure in the swollen form. On the other hand, no such self-assembling behavior is observed for the other polymer without the dipolar side-groups, which precipitates from the DMF-H2O solution with the increase in the water content. The strong dipolar groups acting as associating groups are necessary to avoid polymer molecules forming dense aggregates and precipitating from the solutions after phase separation.