氯配位的鋁錯合物對環己內酯及鹼土金屬(鎂、鈣、鍶)錯合物對乳酸交酯開環聚合反應之研究

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/97525

Title:	氯配位的鋁錯合物對環己內酯及鹼土金屬(鎂、鈣、鍶)錯合物對乳酸交酯開環聚合反應之研究
Authors:	陳泓毓;Chen, Hung-Yu
Contributors:	化學學系
Keywords:	開環聚合反應;鋁錯合物;鹼土金屬錯合物;環酯類
Date:	2025-08-13
Issue Date:	2025-10-17 11:28:51 (UTC+8)
Publisher:	國立中央大學
Abstract:	ε-環己內酯 (ε-caprolactone, ε-CL) 及乳酸交酯 (lactide, LA) 為常見開環聚合研究的內酯單體，因其產生的聚合物PCL及PLA具有良好的生物相容性與可降解性，已廣泛應用於包裝及醫療領域。本研究成功合成兩種鋁金屬錯合物Al(DIPA)₃ 及Al(DIPA)₂Cl，並嘗試對ε-CL進行開環聚合反應。其中Al(DIPA)₂Cl表現出較優異的催化活性，在 4 分鐘內即可達到 92% 的轉化率；相對地，Al(DIPA)₃ 則需 25 分鐘才達到類似的轉化效果（91%）。此外，在提高起始劑BnOH的比例後，反應速率明顯下降，推測 BnOH 可能與催化劑產生相互作用，進而影響聚合反應的進行。另外，本實驗室先前有針對 M(HMDS)₂ (M=Mg、Ca、Sr) 對L-LA的開環聚合反應進行優化，能在短時間內達到很高的轉換率及窄的分子量分佈。為了理解其聚合反應的過程，本研究進一步引入氘代起始劑 BnOD進行動力學實驗，以解析反應過程中的機理。;ε-caprolactone (ε-CL) and lactide (LA) are commonly used cyclic ester monomers in ring-opening polymerization (ROP) studies. Their corresponding polymers, PCL and PLA, exhibit excellent biocompatibility and biodegradability, making them widely applicable in packaging and medical fields. In this study, two aluminum complexes, Al(DIPA)₃ and Al(DIPA)₂Cl, were successfully synthesized and evaluated as catalysts for the ring-opening polymerization of ε-CL. Among them, Al(DIPA)₂Cl demonstrated superior catalytic activity, achieving 92% conversion within 4 minutes, whereas Al(DIPA)₃ required 25 minutes to reach a similar conversion rate (91%). Furthermore, an increase in the ratio of the initiator BnOH led to a noticeable decrease in the polymerization rate, suggesting that BnOH may interact with the catalyst and thereby influence the reaction kinetics. In addition, our laboratory has previously optimized the ring-opening polymerization of L-LA using M(HMDS)₂ (M = Mg, Ca, Sr) as catalysts, achieving high conversion rates and narrow molecular mass distributions within a short reaction time. To further understand the polymerization mechanism, deuterated initiator BnOD was employed in kinetic studies to elucidate the key steps involved in the reaction process.
Appears in Collections:	[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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