CHARACTERISTIC FEATURE OF RING-OPENING POLYMERIZATION OF PROPYLENE OXIDE CATALYZED BY DOUBLE METAL CYANIDE COMPLEX

HUANG Yijun; QI Guorong; FENG Linxian

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CHARACTERISTIC FEATURE OF RING-OPENING POLYMERIZATION OF PROPYLENE OXIDE CATALYZED BY DOUBLE METAL CYANIDE COMPLEX

Research Article | 更新时间：2021-03-19

- CHARACTERISTIC FEATURE OF RING-OPENING POLYMERIZATION OF PROPYLENE OXIDE CATALYZED BY DOUBLE METAL CYANIDE COMPLEX
- Acta Polymerica Sinica Issue 3, Pages: 271-276(2002)
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- Published：20 June 2002，
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HUANG Yijun, QI Guorong, FENG Linxian. CHARACTERISTIC FEATURE OF RING-OPENING POLYMERIZATION OF PROPYLENE OXIDE CATALYZED BY DOUBLE METAL CYANIDE COMPLEX. [J]. Acta Polymerica Sinica (3):271-276(2002)
DOI：

HUANG Yijun, QI Guorong, FENG Linxian. CHARACTERISTIC FEATURE OF RING-OPENING POLYMERIZATION OF PROPYLENE OXIDE CATALYZED BY DOUBLE METAL CYANIDE COMPLEX. [J]. Acta Polymerica Sinica (3):271-276(2002) DOI：

摘要

合成了Co-Zn双金属氰化物(DMC)络合物催化剂

以X-射线衍射、元素分析、红外光谱等手段进行了表征

考察了该催化体系下环氧丙烷开环聚合的反应特性

并初步探讨了聚合反应的机理 .研究发现

Co-Zn双金属氰化物催化剂具有很高的催化活性

适合于中高分子量聚醚的合成

但是碱性起始剂起阻聚作用;在该催化体系下聚合物分子量可控

不饱和度很低(Mn/Mw 13C-NMR分析表明聚合物主链具有无规立构分布的特点

且链节分布几乎都为头-尾方式 .聚合过程中活性链与非活性链之间可能存在一个交换反应 ;虽然聚合反应有终止

但与聚合物链长没有关系

聚合物链的终止是可逆的.

Abstract

A double metal cyanide(DMC) complex based on Zn3[Co(CN)6]2 is prepared and it is characterized by IR

XRD

TGA．This catalytic system is highly active for the ring-opening polymerization (ROP) of propylene oxide

and gives polymers that have narrow MWD(＜1.40) and low unsaturation(＜0.014 meq／g)．The molecular weight of polymer is entirely controlled by reacted monomer to initiator molar ratio(M／I)．The polymers prepared with stepwise addition of monomer exhibit narrower MWD compared with those prepared by one-step addition of monomer．The polymerization involves a rapid exchange equilibrium between the active species and inactive chains． It has also been proved that chain termination of this catalytic system is reversible or temporary．The active centre of catalyst is electron-accepting．The microstructure of the polymer is determined with 13C-NMR spectroscopy．The polymer has a random distribution of the configurational sequences and head-to-hail regiosequence．It is assumed that the polymerization proceeds via a cationic coordination mechanism．

关键词

双金属氰化物络合物开环聚合环氧丙烷

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