Supramolecular Helical Miktoarm Star Polymers
Supramolecular Helical Miktoarm Star Polymers
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DOI：
10.1021/acsmacrolett.1c00802
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发表时间：
2022-03-15
影响因子：
7.015
通讯作者：
Weck, Marcus
中科院分区：
文献类型：
--
作者：
Deng, Ru;Wang, Chengyuan;Weck, Marcus
我们报道了一种含有三个不同螺旋臂的氢键超分子密臂星形聚合物。我们的设计涉及两个螺旋聚（甲基丙烯酰胺）臂，由中心的巴比妥酸（Ba）连接，通过双功能剂的可逆加成-破碎链转移聚合制备。与末端功能化的与Ba互补的Hamilton Wedge （HW）的远螺旋螺旋聚（异氰酸酯）一起，这两种组分组装成AB(2)型星形共聚物。HW和Ba之间的氢键驱动组装，通过H-1核磁共振滴定和等温滴定量热法进行了定量。凝胶渗透色谱法提供了形成所需的米克图安星结构的证据。这种在螺旋聚合物上的位点特异性功能化策略提供了一种模块化的方法来制备具有拓扑多样性构建块的非线性超分子集成。
We report a hydrogen-bonded supramolecular miktoarm star polymer containing three distinct helical arms. Our design involves two helical poly(methacrylamide) arms connected by a barbituric acid (Ba) at the center, prepared through the reversible addition-fragmentation chain-transfer polymerization with a bifunctional agent. Together with a telechelic helical poly(isocyanide) end-functionalized with a Hamilton Wedge (HW) that is complementary to Ba, the two components assemble into an AB(2)-type star copolymer. The assembly is driven by the hydrogen bonding between HW and Ba, which is quantified by H-1 NMR titration and isothermal titration calorimetry. Gel-permeation chromatography provides evidence for the formation of the desired miktoann star architecture. This strategy of site-specific functionalization on helical polymers provides a modular approach to preparing nonlinear supramolecular ensembles with topologically diverse building blocks.