A sulfur-containing styrene derivative, 4-methylenethiochromane (META), was subjected to anionic copolymerization with isoprene (Ip) modified with different additives. The reactivity of META can be effectively regulated with additives; thus, gradient and alternating copolymers were prepared in a facile manner. When THF and TMEDA were utilized in the copolymerization, the reactivity was better than that observed without additives, and thus, gradient copolymers with different gradient extents can be synthesized. In addition, metal alkoxides (such as sodium 2,3-dimethylpentan-3-olate (NaODP) and potassium tert -butoxide ( t -BuOK)) were better able to regulate the reactivity, and the copolymers exhibited alternating and nearly alternating sequences. Therefore, the regulation of the alternating or gradient copolymerization of META and Ip was facilely realized through the use of additives. The sulfur-containing styrene derivative, 4-methylenethiochromane (META), was subjected to anionic copolymerization with isoprene (Ip) modified with different additives. The reactivity of META can be effectively regulated with additives; thus, the regulation of the alternating or gradient copolymerization of META and Ip was facilely realized through the use of additives.

中文翻译：

---

添加剂改性4-亚甲基硫色满(META)与异戊二烯交替和梯度阴离子共聚研究

含硫苯乙烯衍生物 4-亚甲基硫色满 (META) 与用不同添加剂改性的异戊二烯 (Ip) 进行阴离子共聚。META的反应性可以通过添加剂有效调节；因此，以一种简便的方式制备了梯度和交替共聚物。当THF和TMEDA用于共聚时，反应性比没有添加剂时观察到的要好，因此可以合成不同梯度程度的梯度共聚物。此外，金属醇盐（如2,3-二甲基戊醇-3-醇钠（NaODP）和叔丁醇钾（t-BuOK））能够更好地调节反应性，共聚物表现出交替和几乎交替的序列。所以，META 和 Ip 的交替或梯度共聚的调节可以通过使用添加剂轻松实现。将含硫苯乙烯衍生物 4-亚甲基硫色满 (META) 与不同添加剂改性的异戊二烯 (Ip) 进行阴离子共聚。META的反应性可以通过添加剂有效调节；因此，通过使用添加剂很容易实现对 META 和 Ip 交替或梯度共聚的调节。