Hydrophilic Aliphatic Polyesters:  Design, Synthesis, and Ring-Opening Polymerization of Functional Cyclic Esters

2000 ◽  
Vol 33 (13) ◽  
pp. 4619-4627 ◽  
Author(s):  
Mikael Trollsås ◽  
Victor Y. Lee ◽  
David Mecerreyes ◽  
Peter Löwenhielm ◽  
Michael Möller ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Aliphatic Polyesters ◽  
Design Synthesis ◽  
Cyclic Esters

Recent progress in the application of group 1, 2 & 13 metal complexes as catalysts for the ring opening polymerization of cyclic esters

2019 ◽  
Vol 6 (10) ◽  
pp. 2619-2652 ◽  
Author(s):  
Jiahao Gao ◽  
Dongzhi Zhu ◽  
Wenjuan Zhang ◽  
Gregory A. Solan ◽  
Yanping Ma ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ring Opening ◽  
Recent Progress ◽  
Ring Opening Polymerization ◽  
Aliphatic Polyesters ◽  
Cyclic Esters ◽  
Factors Influencing ◽  
Polymer Properties ◽  
Recent Developments ◽  
Group 1

This review focuses on recent developments concerned with the use of well-defined main group complexes as (pre-)catalysts for the ROP of cyclic esters to give aliphatic polyesters; factors influencing catalytic activity, selectivity and polymer properties are all discussed.

Developments in the use of rare earth metal complexes as efficient catalysts for ring-opening polymerization of cyclic esters used in biomedical applications

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Iuliana Cota
Keyword(s):  
Rare Earth ◽  
Ring Opening ◽  
Biomedical Applications ◽  
Earth Metal ◽  
Ring Opening Polymerization ◽  
Organometallic Complexes ◽  
Attractive Alternative ◽  
Aliphatic Polyesters ◽  
Cyclic Esters ◽  
Drug Delivery Devices

AbstractBiodegradable polymers represent a class of particularly useful materials for many biomedical and pharmaceutical applications. Among these types of polyesters, poly(ε-caprolactone) and polylactides are considered very promising for controlled drug delivery devices. These polymers are mainly produced by ring-opening polymerization of their respective cyclic esters, since this method allows a strict control of the molecular parameters (molecular weight and distribution) of the obtained polymers. The most widely used catalysts for ring-opening polymerization of cyclic esters are tin- and aluminium-based organometalliccomplexes; however since the contamination of the aliphatic polyesters by potentially toxic metallic residues is particularly of concern for biomedical applications, the possibility of replacing organometallic initiators by novel less toxic or more efficient organometallic complexes has been intensively studied. Thus, in the recent years, the use of highly reactive rare earth initiators/catalysts leading to lower polymer contamination has been developed. The use of rare earth complexes is considered a valuable strategy to decrease the polyester contamination by metallic residues and represents an attractive alternative to traditional organometallic complexes.

A switchable dimeric yttrium complex and its three catalytic states in ring opening polymerization

2021 ◽  
Author(s):  
Shijie Deng ◽  
Paula L. Diaconescu
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Oxidation States ◽  
Cyclic Esters

A dimeric yttrium phenoxide complex can be oxidized in a stepwise fashion to access three oxidation states. The three states show different activity in the ring opening polymerization of cyclic esters and epoxides.

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