Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)Ti<sup>IV</sup>Cl<sub>2</sub> Complexes

Shuai Li; Yu-bo Wang; He-yuan Ji; Chong-min Chen; Xiao-lu Chen; Li Pan; Bin Wang

doi:10.11777/j.issn1000-3304.2020.20049

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Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)Ti^IVCl₂ Complexes

更新时间：2021-01-26

- Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)Ti^IVCl₂ Complexes
- Acta Polymerica Sinica Vol. 51, Issue 9, Pages: 1039-1049(2020)
- 作者机构：
  
  天津大学材料科学与工程学院　天津 300350
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2020.20049
  CLC：
- Published：15 August 2020，
  
  Published Online：30 April 2020，
  
  Received：29 February 2020，
  
  Revised：8 March 2020，
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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)Ti^IVCl₂ Complexes. [J]. Acta Polymerica Sinica 51(9):1039-1049(2020)
DOI：

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)Ti^IVCl₂ Complexes. [J]. Acta Polymerica Sinica 51(9):1039-1049(2020) 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

配合物(Salen)Ti

，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

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

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

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

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

complexes could effectively catalyze the ROAC of phthalate anhydrides (PA) and cyclohexene oxide (CHO)

affording perfectly alternating polyester. The Lewis acidity of Ti

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

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

/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

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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⁰

Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)TiIVCl2 Complexes

DOI：10.11777/j.issn1000-3304.2020.20049

摘要

Abstract

关键词

Keywords

references

Ring-opening Alternating Copolymerization of Epoxides/Cyclic Anhydrides Catalyzed by (Salen)Ti^IVCl₂ Complexes