α-Ethylidene-δ-vinyl-δ-valerolactone (EVL) is the only intermediate to synthesize copolymers of CO₂ with 1,3-butadiene whose ring-opening polymerization (ROP), however, is obstructed by the tiglate group. In the contribution, EVL derivatives are synthesized through a Michael addition reaction to saturate the conjugated double bond as well as introduce various groups to synthesize polyesters with designable molecular weights (M_n = 6.9–12.8 kg·mol^–1), narrow dispersities (Đ = 1.08–1.19), tunable glass-transition temperatures (T_g = −45–3 °C), and excellent refractive indices (n_d = 1.64–1.79) via living and controlled ROP. The obtained polyesters are able to be recycled to the corresponding monomers, which can prepare comparable polymers with identical side groups, realizing the homorecycling. In addition, the retro-Michael addition reaction is established and employed, realizing heterorecycling, which can alter properties during recycling. We propose a strategy for EVL derivatives and establish the corresponding polyester platform with not only high refractive indices and tunable T_gs, but also the ability to tailor properties during recycling.

中文翻译：

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具有高折射率和 CO2、1,3-丁二烯和硫醇闭环可回收性的聚酯平台


α-亚乙基-δ-乙烯基-δ-戊内酯（EVL）是合成 CO ₂ 与 1,3-丁二烯共聚物的唯一中间体，但其开环聚合（ROP）受到阻碍蒂格拉特集团。该论文通过迈克尔加成反应合成EVL衍生物，使共轭双键饱和，并引入各种基团，合成具有可设计分子量的聚酯（M _n = 6.9–12.8 kg·mol ^–1 ）、窄色散 (Đ = 1.08–1.19)、可调玻璃化转变温度 (T _g = −45–3 °C) 和出色的折射率 (n _d s，而且还具有在回收过程中定制性能的能力。