Improvement in titanium complexes supported by Schiff bases in ring-opening polymerization of cyclic esters: ONO-tridentate Schiff bases

Polymer ◽  
2018 ◽  
Vol 140 ◽  
pp. 315-325 ◽  
Author(s):  
Hsiu-Wei Ou ◽  
Wei-Yi Lu ◽  
Jaya Kishore Vandavasi ◽  
Ya-Fan Lin ◽  
Hsuan-Ying Chen ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Titanium Complexes ◽  
Cyclic Esters

scholarly journals Use of Titanium Complexes Bearing Diphenolate or Calix[n]arene Ligands in α-Olefin Polymerization and the ROP of Cyclic Esters

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 210 ◽  
Author(s):  
Orlando Santoro ◽  
Carl Redshaw
Keyword(s):  
Ring Opening ◽  
Olefin Polymerization ◽  
Ring Opening Polymerization ◽  
Molecular Structures ◽  
Titanium Complexes ◽  
Cyclic Esters ◽  
Arene Ligands ◽  
Catalytic Behaviour

In this review, we discuss the use of titanium complexes bearing either bridged diphenolate or calix[n]arene (n = 4, 6, 8) ligation, in the formation of plastics from α-olefins or via the ring opening polymerization (ROP) of cyclic esters. The syntheses, molecular structures and catalytic behaviour of these systems are discussed, as well as where possible, the properties of the resultant polymers.

Titanium Complexes of Pyrrolylaldiminate Ligands and Their Exploitation for the Ring-Opening Polymerization of Cyclic Esters

2021 ◽  
Author(s):  
Kanokon Upitak ◽  
Worawat Wattanathana ◽  
Tanin Nanok ◽  
Pitak Chuawong ◽  
Pimpa Hormnirun
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Titanium Complexes ◽  
Cyclic Esters ◽  
X Ray

A series of six-coordinate titanium complexes 1−6 supported by pyrrolylaldiminate ligands were prepared via the reaction of 2 equivalent of ligands and Ti(OiPr)4 in toluene at 70 ºC. The X-ray...

Stereoselective ring-opening polymerization of rac-lactides catalyzed by titanium complexes containing N,N-bidentate phenanthrene derivatives

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13437-13442 ◽  
Author(s):  
Bo Gao ◽  
Qian Duan ◽  
Yanhui Li ◽  
Dongni Li ◽  
Liqiu Zhang ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Titanium Complexes ◽  
Lactide Polymerization

Titanium complexes bearing N,N-bidentate diamido derived from Schiff bases were investigated as catalysts for lactide polymerization.

scholarly journals Titanium complexes bearing oxa- and azacalix[4, 6]arenes: structural studies and use in the ring opening homo-/co-polymerization of cyclic esters

2021 ◽  
Vol 50 (12) ◽  
pp. 4396-4407
Author(s):  
Tian Xing ◽  
Timothy J. Prior ◽  
Kai Chen ◽  
Carl Redshaw
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Structural Studies ◽  
Titanium Complexes ◽  
Cyclic Esters

Rare examples of titanium oxa- and aza-calixarenes are reported which are active for the ring opening polymerization (ROP) of ε-caprolactone, δ-valerolactone and rac-lactide.

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.

Ring-Opening Polymerization of Lactide Using Aluminum Salen-Type Initiators

2014 ◽  
Vol 915-916 ◽  
pp. 713-716
Author(s):  
Qing Zhang ◽  
Jing Tian ◽  
Zhi Qi Cao ◽  
Ru Xia Xu ◽  
Zhen Zhen Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Magnetic Resonance ◽  
Schiff Bases ◽  
Reaction Temperature ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Resonance Spectroscopy ◽  
Aluminum Complex

In this investigation, Schiff bases aluminum complex was synthesized and used as the initiator in the polymerization of D,L-lactide. The aluminum complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of D, L-lactide/Al3+ on the synthesis of polylactide were described. The results showed that Schiff bases aluminum complex could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of D,L-lactide, which included D,L-lactide/Al3+ (mol/mol) ratio of 250, reaction temperature of 120 °C, and reaction time of 16 hours.

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