Efficient Catalysts for Ring-Opening Polymerization of epsilon-Caprolactone and beta-Butyrolactone: Synthesis and Characterization of Zinc Complexes Based on Benzotriazole Phenoxide Ligands

NCU Institutional Repository > 工學院 > 化學工程與材料工程學系 > 期刊論文 > Item 987654321/49935

請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/49935

題名:	Efficient Catalysts for Ring-Opening Polymerization of epsilon-Caprolactone and beta-Butyrolactone: Synthesis and Characterization of Zinc Complexes Based on Benzotriazole Phenoxide Ligands
作者:	Tai,YE;Li,CY;Lin,CH;Liu,YC;Ko,BT;Sun,YS
貢獻者:	化學工程與材料工程學系
關鍵詞:	IMMORTAL POLYMERIZATION;METAL-COMPLEXES;CYCLIC ESTERS;L-LACTIDE;ALUMINUM COMPLEXES;YTTRIUM ALKOXIDES;MAGNESIUM;INITIATORS;LACTONES;COPOLYMERS
日期:	2011
上傳時間:	2012-03-27 16:26:54 (UTC+8)
出版者:	國立中央大學
摘要:	A series of efficient zinc catalysts supported by sterically bulky benzotriazole phenoxide (BTP) ligands are synthesized and structurally characterized. The reactions of diethyl zinc (ZnEt(2)) with (CMe2Ph)BTP-H, (t-Bu)BTP-H, and (TMCl)BTP-H yield mono-adduct [(mu-BTP)ZnEt](2) (1-3), respectively. Bisadduct complex [((t-Bu)BTP)(2)Zn] (4) results from treatment of ZnEt(2) with (t-Bu)BTP-H (2 equiv.) in toluene, but treatment of (TMCl)BTP-H with ZnEt(2) in the same stoichiometric proportion in Et(2)O produces five-coordinated monomeric complex [((TMCl)BTP)(2)Zn(Et(2)O)] (5). The molecular structures of compounds 1, 4, and 5 are characterized by X-ray crystal structure determinations. All complexes 1-5 are efficient catalysts for the ring-opening polymerization of epsilon-caprolactone (epsilon-CL) in the presence of 9-anthracenemethanol. Experimental results indicate that complex 3 exhibits the greatest activity with well-controlled character among these complexes. The polymerizations of epsilon-CL and beta-butyrolactone catalyzed by 3 are demonstrated in a "living" character with narrow polydispersity indices (monomer-to-initiator ratio in the range of 25-200, PDIs <= 1.10). The "immortal" character of 3 provides a way to synthesize as much as 16-fold polymer chains of poly(epsilon-CL) (PCL) with narrow PDI in the presence of a catalyst in a small proportion. The controlled fashion of complex 3 also enabled preparation of the PCL-b-poly(3-hydroxybutyrate) copolymer. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: PolymChem49: 4027-4036, 2011
關聯:	JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	568	檢視/開啟

在NCUIR中所有的資料項目都受到原著作權保護.

社群 sharing

資料載入中.....