Controlled ring-expansion polymerization of thiiranes based on cyclic aromatic thiourethane initiator,Journal of Polymer Science Part A: Polymer Chemistry

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Controlled ring-expansion polymerization of thiiranes based on cyclic aromatic thiourethane initiator
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2019-09-11 , DOI: 10.1002/pola.29490
Akira Takahashi ₁ , Ryu Yuzaki ₁ , Yoshihito Ishida ₂ , Atsushi Kameyama ₁

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Ring-expansion polymerization (REP) of thiiranes was investigated using 3H-benzothiazol-2-one (BT) as the cyclic aromatic thiourethane initiator in the presence of tetrabutylammonium chloride (TBAC) catalyst. The polymerization proceeded in a well-controlled manner to afford cyclic polysulfides with one BT moiety per macrocycle, as confirmed by MALDI-TOF MS spectroscopy. Differential scanning calorimetry (DSC) measurement of the obtained cyclic polysulfides revealed slight decrease in the glass-transition temperature as the increase in the molecular weight, supporting the cyclic topology of the products. Postpolymerization of thiiranes using the BT-initiated cyclic polysulfide as the macroinitiator afforded the ring-expanded product while maintaining the narrow polydispersity and well-defined cyclic structure, which enabled precise synthesis of cyclic block copolymer with different thiirane combination. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2442–2449

中文翻译：

基于环状芳族硫氨酯引发剂的硫杂丙环可控扩环聚合

使用 3 H研究了硫杂丙环的扩环聚合 (REP)-benzothiazol-2-one (BT) 在四丁基氯化铵 (TBAC) 催化剂存在下作为环状芳族硫氨酯引发剂。正如 MALDI-TOF MS 光谱所证实的，聚合以良好控制的方式进行，得到每个大环一个 BT 部分的环状多硫化物。所得环状多硫化物的差示扫描量热法 (DSC) 测量显示，随着分子量的增加，玻璃化转变温度略有下降，这支持了产物的环状拓扑结构。使用 BT 引发的环状多硫化物作为大分子引发剂对硫杂丙环进行后聚合，得到了扩环产物，同时保持了窄的多分散性和明确的环状结构，从而能够精确合成具有不同硫杂环丙烷组合的环状嵌段共聚物。© 2019 Wiley Periodicals, Inc. J. Polym。科学，A 部分：Polym。化学。2019 , 57 , 2442–2449

更新日期：2019-09-11

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