尋找石化塑膠替代品是近年社會關注的重要議題，而聚酯擁有易降解及可回收的特性，被認為其具有高潛力替代石化塑膠且由於其高度生物相容性，其中由內酯單體γ-butyrolactone（γ-BL）聚合形成的聚丁內酯降解速度極快，在降解回收單體部分具有強大的優勢。本研究主要針對γ-BL進行聚合反應，催化劑部分使用具有六甲基二矽氮烷（HMDS）配位機的鎂、鈣、鍶錯合物，HMDS具有較大的立體位阻，能有效的在反應中穩定中心金屬。此催化於氮氣的環境下進行，在反應溫度為-50度的條件下成功對γ-BL單體進行開環聚合，並且通過調整起始劑BnOH（BnOH）及二苯基甲醇（Ph2CHOH）使用的比例，在使用Mg(HMDS)2作為催化劑的條件下，聚合反應可以達到極好的控制性（Conv.=40% ， Ð = 1.08）。從實驗結果來看Mg(HMDS)2在對γ-BL單體的開環聚合實驗中，配合特定比例之BnOH及二苯基甲醇使用能使開環聚合反應穩定且具有控制性的進行。;The development of sustainable alternatives to petroleum-based plastics has become an important issue in recent years. Among the various candidates， polyesters have attracted considerable attention owing to their biodegradability， recyclability， and excellent biocompatibility. In particular， poly(γ-butyrolactone)（PγBL）， which is synthesized from the lactone monomer γ-butyrolactone（γ-BL）， exhibits rapid degradation and offers significant advantages in monomer recovery through chemical recycling. In this study， the ring-opening polymerization（ROP）of γ-BL was investigated using magnesium， calcium， and strontium complexes bearing hexamethyldisilazide（HMDS）ligands as catalysts. The bulky steric hindrance provided by the HMDS ligands effectively stabilizes the metal centers during the polymerization process. The polymerization reactions were conducted under a nitrogen atmosphere at −50 °C， and successful ROP of γ-BL was achieved. Furthermore， by adjusting the ratio of benzyl alcohol（BnOH）and diphenylmethanol（Ph₂CHOH）as initiators， excellent control over the polymerization was obtained when Mg(HMDS)2 was employed as the catalyst， achieving a monomer conversion of 40% and a dispersity（Ð）of 1.08. The experimental results demonstrate that Mg(HMDS)2， in combination with a specific ratio of BnOH and Ph₂CHOH， enables the controlled and stable ring-opening polymerization of γ-BL， providing an effective catalytic system for the synthesis of well-defined poly(γ-butyrolactone).
