Topologically Reversible Transformation of Tricyclic Polymer into Polyring Using Disulfide/Thiol Redox Chemistry,Macromolecules

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Topologically Reversible Transformation of Tricyclic Polymer into Polyring Using Disulfide/Thiol Redox Chemistry
Macromolecules ( IF 5.1 ) Pub Date : 2018-07-11 00:00:00 , DOI: 10.1021/acs.macromol.8b00714
Aruna Kumar Mohanty ₁ , Jihwa Ye ₁ , Junyoung Ahn ₂ , Taeil Yun ₃ , Taeheon Lee ₁ , Kyung-su Kim ₁ , Heung Bae Jeon ₃ , Taihyun Chang ₂ , Hyun-jong Paik ₁

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A polyring capable of reversible growth and dissociation is synthesized from a tricyclic polystyrene (PS) prepared by combining atom transfer radical polymerization of a 4-arm star-shaped PS and azide–alkyne click reactions. In the preparation of the tricyclic PS, a coupling agent containing a disulfide linkage is used in the click cyclization reaction. The reduction of the disulfide linkage in the tricyclic PS results in an 8-shaped PS with thiol groups which on oxidation leads to a high molecular weight polyring. The topology transformation between the polymers occurs via reversible redox reaction of disulfide/thiol. The high molecular weight of the polyring is realized due to the formation of flexible S–S linkage between the 8-shaped PSs. Their structures are confirmed by FT-IR, ¹H NMR, SEC, and MALDI-TOF MS analyses. In addition, molecular weight control of the polyring according to polymer concentration has been confirmed through SEC analysis.

中文翻译：

使用二硫键/硫醇氧化还原化学方法将三环聚合物拓扑可逆地转化为多环

通过将四臂星形PS的原子转移自由基聚合与叠氮化物-炔烃点击反应相结合而制备的三环聚苯乙烯（PS）合成了可逆生长和解离的多环。在制备三环PS时，在点击环化反应中使用含有二硫键的偶联剂。三环PS中二硫键的还原导致带有硫醇基团的8形PS在氧化时导致高分子量的聚环。聚合物之间的拓扑转变是通过二硫键/硫醇的可逆氧化还原反应发生的。聚环的高分子量是由于8形PS之间形成了柔性的S–S键而实现的。其结构已通过FT-IR确认¹1 H NMR，SEC和MALDI-TOF MS分析。另外，已经通过SEC分析确认了根据聚合物浓度对多环的分子量进行控制。

更新日期：2018-07-11

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