Ring-opening polymerization (ROP) of lactones catalyzed by 1,5,7-triazabicyclo[4,4,0]decane-5-ene (TBD) is a highly efficient method for synthesizing aliphatic polyester materials. In order to create a green and sustainable synthetic route for poly(δ-valerolactone) with a narrow molecular weight distribution, we propose CO₂ as the terminator instead of conventional organic acids, which are difficult to remove from the production solution. A flow ROP reactor for δ-valerolactone is employed to enhance the mass transfer of CO₂ and implement the ROP reaction continuously. In addition to the quenching method, n-hexane is proposed as the antisolvent of the production solution to precipitate poly(δ-valerolactone) from toluene instead of normally used methanol, which works as an initiator of ROP that influences the molecular weight of polyesters as an impurity of the reaction solution. Owing to the strong hydrophobicity and volatility of n-hexane, the anhydrous toluene and residual δ-valerolactone have strong potential to be recycled via distillation separation.

中文翻译：

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TBD 催化开环聚合反应绿色可持续合成聚（δ-戊内酯）

1,5,7-三氮杂双环[4,4,0]癸烷-5-烯（TBD）催化内酯的开环聚合（ROP）是合成脂肪族聚酯材料的高效方法。为了为分子量分布较窄的聚（δ-戊内酯）创造一条绿色可持续的合成路线，我们建议使用 CO ₂作为终止剂，而不是传统的有机酸，这些有机酸很难从生产溶液中去除。δ-戊内酯流动ROP反应器用于增强CO ₂的传质并连续进行ROP反应。除了淬火方法，n正己烷被提议作为生产溶液的反溶剂，从甲苯中沉淀聚（δ-戊内酯）而不是通常使用的甲醇，甲醇作为 ROP 的引发剂，影响聚酯的分子量，作为反应溶液的杂质。由于强的疏水性和波动Ñ己烷，无水甲苯和残留的δ戊内酯必须被再循环强大潜力通过精馏分离。