Connectivity defects enhance chain dynamics in supramolecular polymer model‐network gels
Connectivity defects enhance chain dynamics in supramolecular polymer model‐network gels
复制标题
连接缺陷增强了超分子聚合物模型网络凝胶中的链动力学
DOI:
10.1002/polb.24250
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
S. Seiffert
中科院分区:
文献类型:
--
作者:
A. Habicht;S. Czarnecki;T. Rossow;S. Seiffert
Supramolecular polymer networks exhibit twofold dynamics: that of their polymer chains and that of the transient bonds between them, which is further complexed when irregular network structures lead to local variation of both. A typical irregularity is imperfect network‐chain connectivity. To assess the impact of that, we study the diffusion of three different types of tracer polymers in supramolecular model networks of four‐arm star‐shaped poly(ethylene glycol). First, we focus on tracers that carry three stickers and one fluorescent label at their four arms, thereby creating an inherent network connectivity defect in their vicinity. Second, we embed tracers that carry four stickers and four labels and that donotintrinsically create network defects. Third, we embed non‐sticky tracers with a larger size than the network meshes, thereby sterically obstructing their connectivity. These studies reveal that the first tracers can rapidly walk within the networks by sequential arm detachment abovec*, whereas belowc*, they are subject to a dynamic equilibrium of liberated and gel‐cluster‐bound portions. By contrast, the second tracers are efficiently incorporated into the network, which dramatically hinders their motion. Opposed to that, the third tracers can diffuse almost as unhindered as if they were embedded within an uncrosslinked matrix. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2017,55, 19–29
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