A unique cooperative catalytic system carrying metallic iron and 2-hydroxyethyl 2-bromoisobutyrate for the controlled/living ring-opening polymerization of ε-caprolactone

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11400-11406 ◽  
Author(s):  
Xiu-Juan Shang ◽  
Wen-Hua Zhang ◽  
Jian-Ping Lang
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Catalytic System ◽  
Weight Distribution ◽  
Metallic Iron ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Narrow Molecular Weight Distribution

Iron and 2-hydroxyethyl 2-bromoisobutyrate cooperatively initiates the ε-caprolactone polymerization, yielding polymers with high molecular weight and narrow molecular weight distribution.

Organocatalytic Ring-Opening Polymerization Strategies for Synthesis of Poly(phosphothioesters) with a Pendent Phenyl Group

Synlett ◽  
2020 ◽  
Vol 31 (12) ◽  
pp. 1167-1171 ◽  
Author(s):  
Guangqiang Xu ◽  
Xin-Qi Hao ◽  
Qinggang Wang ◽  
Huating Yan ◽  
Rulin Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Weight Distribution ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Phenyl Group ◽  
Ring Opening Polymerization ◽  
Polymerization Process ◽  
Narrow Molecular Weight Distribution ◽  
Living Nature

A novel type of phosphothioester substrate, 2-phenyl-1,3,2-dioxaphospholane 2-sulfide (PTP), has been synthesized and subjected to ring-opening polymerization. DBU/thiourea served as an efficient cooperative organocatalyst for the synthesis of poly(PTP), delivering the polymer with a well-defined structure, a relatively narrow molecular-weight distribution (1.14–1.20), and high molecular weight (up to 45.2 kg/mol). The ring-opening polymerization process showed a controlled/living nature. In addition, diblock copolymers of PTP with rac-lactide with well-defined structures were also synthesized.

Bis(phenolate) N-heterocyclic carbene rare earth metal complexes: synthesis, characterization and applications in the polymerization of n-hexyl isocyanate

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 83295-83303 ◽  
Author(s):  
Min Zhang ◽  
Jingjing Zhang ◽  
Xufeng Ni ◽  
Zhiquan Shen
Keyword(s):  
Molecular Weight ◽  
Rare Earth ◽  
Metal Complexes ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Rare Earth Metal ◽  
Weight Distribution ◽  
Earth Metal ◽  
Narrow Molecular Weight Distribution ◽  
Rare Earth Metal Complexes

Polyhexyl isocyanantes catalyzed by N-heterocyclic carbene rare earth metal complexes show high molecular weight with narrow molecular weight distribution.

scholarly journals Modeling of Molecular Weight Distribution in Ring-Opening Polymerization of l,l-Lactide

2014 ◽  
Vol 53 (18) ◽  
pp. 7333-7342 ◽  
Author(s):  
Yingchuan Yu ◽  
Eric J. Fischer ◽  
Giuseppe Storti ◽  
Massimo Morbidelli
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Ring Opening ◽  
Ring Opening Polymerization

Syndiospecific polymerization of styrene by half-titanocene catalysts with the sulfur-containing donor ligand

e-Polymers ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 277-281 ◽  
Author(s):  
Wei Wang ◽  
Gang Zheng ◽  
Hongtao Wang
Keyword(s):  
Molecular Weight ◽  
Catalytic Activity ◽  
High Molecular Weight ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
High Catalytic Activity ◽  
Narrow Molecular Weight Distribution ◽  
Donor Ligand ◽  
High Yields ◽  
Sulfur Containing

AbstractMonocyclopentadienyl titanium complexes of the type Cp*TiX2 L (Cp*=C5 Me5, 1: L=C6 F5 S, X=OMe; 2: L=C6 F5 S, X=Cl; 3: L=2, 6-Me2-C6 H3 S, X=OMe) have been synthesized with high yields. These complexes are used as the catalysts for the syndiospecific polymerization of styrene. High catalytic activity is observed, and a polymer with high molecular weight and narrow molecular weight distribution is obtained. It is concluded that not only the sulfur-containing donor ligand but also the anion ligand strongly affects the polymerization activity and the molecular weight of the resultant polymer.

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