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(Salen)TiIVCl2配合物催化环氧化物和环酸酐开环交替共聚
Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)TiIVCl2 Complexes
- 高分子学报 2020年51卷第9期 页码：1039-1049
- 作者机构：
天津大学材料科学与工程学院 天津 300350
- 作者简介：
E-mail: binwang@tju.edu.cn Bin Wang, E-mail: binwang@tju.edu.cn
- 基金信息：国家自然科学基金(基金号 51973156，21604061)资助项目
DOI：10.11777/j.issn1000-3304.2020.20049
中图分类号：纸质出版日期：2020-8-15，
网络出版日期：2020-4-30，
收稿日期：2020-2-29，
修回日期：2020-3-8，
扫 描 看 全 文
李帅, 王昱博, 季鹤源, 陈崇民, 陈晓璐, 潘莉, 王彬. (Salen)TiIVCl2配合物催化环氧化物和环酸酐开环交替共聚[J]. 高分子学报, 2020,51(9):1039-1049.
Shuai Li, Yu-bo Wang, He-yuan Ji, Chong-min Chen, Xiao-lu Chen, Li Pan, Bin Wang. Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)TiIVCl2 Complexes[J]. Acta Polymerica Sinica, 2020,51(9):1039-1049.
李帅, 王昱博, 季鹤源, 陈崇民, 陈晓璐, 潘莉, 王彬. (Salen)TiIVCl2配合物催化环氧化物和环酸酐开环交替共聚[J]. 高分子学报, 2020,51(9):1039-1049. DOI： 10.11777/j.issn1000-3304.2020.20049.
Shuai Li, Yu-bo Wang, He-yuan Ji, Chong-min Chen, Xiao-lu Chen, Li Pan, Bin Wang. Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)TiIVCl2 Complexes[J]. Acta Polymerica Sinica, 2020,51(9):1039-1049. DOI： 10.11777/j.issn1000-3304.2020.20049.
摘要
合成、表征了一类具有salen型配体骨架的Ti
IV
配合物(Salen)Ti
IV
Cl
2
，并研究了它们在催化环酐/环氧开环交替共聚合时的催化性能与催化行为. 这些配合物在结构上与传统的(Salen)M
III
Cl配合物(M = Al，Co和Cr)不同，在配位平面的轴向有2个Cl
−
基团，不存在空的配位点. 以双(三苯基膦)亚胺氯化物(PPNCl)为助催化剂，(Salen)Ti
IV
Cl
2
配合物可以有效催化常见环酸酐和环氧化物的开环交替共聚合，生成具有完美交替结构的聚酯. 聚合活性取决于Salen-Ti
IV
配合物路易斯酸性、配体骨架和单体结构. 初步的链引发反应机理研究表明，(salen)Ti
IV
Cl
2
配合物中的轴向Cl
−
基团可与助催化剂中的阴离子发生配体交换而引发聚合反应.
Abstract
Tetravalent titanium complexes with salen-type ligands were synthesized
characterized and tested as catalyst for the ring-opening alternating copolymerization (ROAC) of epoxides and cyclic anhydrides. These (salen)Ti
IV
Cl
2
complexes are structurally different from the typical (salen)M
III
Cl complexes (M = Al
Co and Cr)
in which two Cl
−
groups and no vacant coordination site exist in the axial positions. In the presence of bis(triphenylphosphine)iminium chloride (PPNCl)
these (salen)Ti
IV
Cl
2
complexes could effectively catalyze the ROAC of phthalate anhydrides (PA) and cyclohexene oxide (CHO)
affording perfectly alternating polyester. The Lewis acidity of Ti
IV
complexes and structures of cocatalyst affected significantly the catalytic activities. Chain initiation investigation indicated that the copolymerization was initiated by the axial Cl
−
group in (salen)Ti
IV
Cl
2
complex rather than the nucleophile in the cocatalyst
which is very different from the mechanism proposed for ROAC catalyzed by (salen)Al
III
Cl/PPNCl binary system. Meanwhile
(salen)Ti
IV
Cl
2
/PPNCl system exhibited broad monomer adaptability
allowing for the preparation of polyesters with structural diversity
via
copolymerization of some common cyclic anhydrides and epoxides. Our present work demonstrated a rare example of cyclic anhydride/epoxide copolymerization catalyzed by (salen)Ti
IV
Cl
2
complex.
关键词
开环交替共聚合聚酯钛(IV)配合物环酐环氧化物
Keywords
Ring-opening alternating copolymerizaitonPolyesterTitanium(IV) complexesCyclic anhydridesEpoxides
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