Spacer Chains Prevent the Intramolecular Complexation in Miktoarm Star Polymers.
Spacer Chains Prevent the Intramolecular Complexation in Miktoarm Star Polymers.
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间隔链防止 Miktoarm 星形聚合物中的分子内络合
DOI：
10.1021/acs.jpcb.8b01663
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Schneider
中科院分区：
文献类型：
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作者：
P. Hebbeker;T. Langen;F. Plamper;S. Schneider
研究了间隔链对星形杂臂(杂臂)聚合物分子内络合作用的影响。为了克服具有不同均聚臂的星中不同聚合物组分之间的相互吸引，将不同长度的间隔链连接到星的核心上的三个不同位置。在大多数被调查的案例中，这导致了MICTOARM星形分子中的两嵌段共聚臂。因此，内部间隔物将外层嵌段与其具有吸引力的相互作用的均聚体臂分开。通过对一个简单的微珠弹簧模型进行蒙特卡罗模拟，得到了分子内络合作用和星形聚合物结构的影响。然后，长间隔基团可以完全防止络合。间隔链的局部屏蔽和间隔链导致的形成络合物的聚合物之间的距离增加都抑制了络合物的形成。对于一定范围的间隔基位置和长度，在形成络合物的体系和形成络合物的自由体系之间找到了平衡。间隔链可以作为调节分子内络合作用的工具。
The influence of spacer chains on the intramolecular complexation in star-shaped heteroarm (miktoarm) polymers is investigated. To overcome the mutual attraction of different polymeric components present in a miktoarm star with different homopolymeric arms, spacer chains of different length are attached to the core of the star at three different positions. In most of the investigated cases, this leads to diblock copolymer arms within the miktoarm star. Hereby, the inner spacer separates the outer blocks from their attractively interacting homopolymeric arms. The effect on the intramolecular complexation and the structure of the star polymer is obtained by Monte Carlo simulations of a simple bead-spring model. Then, long spacers can completely prevent the complexation. Both, local shielding by the spacer chains and the increased distance between the complex-forming polymers due to the spacer chains inhibit the complex formation. For a range of spacer positions and lengths, an equilibrium between a system forming a complex and a complex free system is found. The spacer chains can be used as a tool to tune the intramolecular complexation.