Bulk Ring-Opening Polymerization of ε-Caprolactone by Zeolitic Imidazolate Framework

被引：15

作者：

Naz, Farah ^{[1
,2
]}

Mumtaz, Fatima ^{[5
]}

Chaemchuen, Somboon ^{[1
,4
]}

Verpoort, Francis ^{[1
,3
,4
,6
]}

机构：

[1] Wuhan Univ Technol, Lab Organometall Catalysis & Ordered Mat, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China

[2] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China

[3] Khalifa Univ Sci & Technol, Coll Arts & Sci, POB 127788, Abu Dhabi, U Arab Emirates

[4] Natl Res Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia

[5] Univ Sci & Technol China, CAS Key Lab Soft Matter Chem, Dept Polymer Sci & Engn, Hefei 230026, Anhui, Peoples R China

[6] Univ Ghent, CEER, Global Campus,119 Songdomunhwa Ro, Incheon 406840, South Korea

来源：

CATALYSIS LETTERS | 2019年 / 149卷 / 08期

基金：

中国国家自然科学基金; 俄罗斯基础研究基金会;

关键词：

Ring-opening polymerization; Biodegradable polycaprolactone; Metal-organic frameworks; Zeolitic imidazole frameworks; Heterogeneous catalyst; L-LACTIDE; CATALYST; ZIF-8; LACTONES; POLYESTERS; MECHANISM; KINETICS;

D O I：

10.1007/s10562-019-02816-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, for the first time, zeolitic imidazolate frameworks (ZIFs=ZIF-8, ZIF-67, and Zn/Co-ZIF), obtained via spray drying, were used as heterogeneous catalysts for the ring opening polymerization of epsilon-Caprolactone without any co-catalyst or initiator. The catalytic activity of the spray dried ZIFs series varies in the order of Zn/Co-ZIF<ZIF-67<ZIF-8. It was found that the catalytic activities of ZIFs series correlate with the defects present in their structure. Among active sites of ZIFs, only the acid sites derived from structural defects are supposed to catalyse the polymerization reaction. Under optimal reaction conditions, ZIF-8 shows a superior catalytic activity compared to ZIF-67 or Zn/Co-ZIF and leads to the formation of higher molecular weight linear polycaprolactone. The recyclability test confirmed that the catalyst could be reused and no significant loss of catalytic activity was found after three uses. [GRAPHICS] .

引用

页码：2132 / 2141

页数：10

共 32 条

[1] Zn(II) and Cu(II) formamidine complexes: structural, kinetics and polymer tacticity studies in the ring-opening polymerization of ε-caprolactone and lactides [J].