Poly(ʟ-lactide)s with Tetraphenylethylene: Role of Polymer Chain Packing on Aggregation-Induced Emission Behavior of Tetraphenylethylene

2022 ◽  
Author(s):  
Virat Gandu ◽  
Bhoje Gowd
Keyword(s):  
Polymer Chain ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Chain Packing ◽  
Aggregation Induced Emission ◽  
Fluorescent Polymers ◽  
Emission Behavior

Development of biocompatible and biodegradable fluorescent polymers and understanding their fluorescent characteristics are highly desirable. In this work, we synthesized one-armed, two-armed and four-armed poly(ʟ-lactide)s by ring-opening polymerization of ʟ-lactide...

scholarly journals DFT Modeling of Organocatalytic Ring-Opening Polymerization of Cyclic Esters: A Crucial Role of Proton Exchange and Hydrogen Bonding

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2078 ◽  
Author(s):  
Ilya Nifant’ev ◽  
Pavel Ivchenko
Keyword(s):  
Ring Opening ◽  
Density Functional ◽  
Comparative Modeling ◽  
Ring Opening Polymerization ◽  
Proton Exchange ◽  
Dft Methods ◽  
Experimental Proof ◽  
Cyclic Esters ◽  
Dft Modeling

Organocatalysis is highly efficient in the ring-opening polymerization (ROP) of cyclic esters. A variety of initiators broaden the areas of organocatalysis in polymerization of different monomers, such as lactones, cyclic carbonates, lactides or gycolides, ethylene phosphates and phosphonates, and others. The mechanisms of organocatalytic ROP are at least as diverse as the mechanisms of coordination ROP; the study of these mechanisms is critical in ensuring the polymer compositions and architectures. The use of density functional theory (DFT) methods for comparative modeling and visualization of organocatalytic ROP pathways, in line with experimental proof of the structures of the reaction intermediates, make it possible to establish these mechanisms. In the present review, which continues and complements our recent manuscript that focused on DFT modeling of coordination ROP, we summarized the results of DFT modeling of organocatalytic ROP of cyclic esters and some related organocatalytic processes, such as polyester transesterification.

The role of ligand redox non-innocence in ring-opening polymerization reactions catalysed by bis(imino)pyridine iron alkoxide complexes

2017 ◽  
Vol 46 (38) ◽  
pp. 12971-12980 ◽  
Author(s):  
K. R. Delle Chiaie ◽  
A. B. Biernesser ◽  
M. A. Ortuño ◽  
B. Dereli ◽  
D. A. Iovan ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Oxidation States ◽  
Polymerization Catalysts ◽  
Iron Based

The reactivity of iron-based ring opening polymerization catalysts is compared when the catalyst is in three different oxidation states.

Thermal property of an aggregation-induced emission fluorophore that forms metal–ligand complexes with Zn(ClO4)2 of salicylaldehyde azine-functionalized polybenzoxazine

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65635-65645 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Ruey-Chorng Lin ◽  
Jia-Huei Tu ◽  
Fang-Hsien Lu ◽  
Jin-Long Hong ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermal Property ◽  
Ring Opening ◽  
Zinc Ion ◽  
Ring Opening Polymerization ◽  
Aggregation Induced Emission ◽  
Metal Ligand

A salicylaldehyde azine-functionalized benzoxazine monomer formed zinc ion complexes not only improved the thermal properties but also facilitated ring-opening polymerization.

Ring Opening Polymerization of ε-Caprolactone Catalyzed with Magnesium Lactate

2009 ◽  
Vol 610-613 ◽  
pp. 1208-1210 ◽  
Author(s):  
Lian Liu ◽  
Zhi Yong Wei ◽  
Pei Wang ◽  
Min Qi
Keyword(s):  
Nmr Spectroscopy ◽  
Reaction Temperature ◽  
13C Nmr ◽  
Ring Opening ◽  
Synthesis Method ◽  
13C Nmr Spectroscopy ◽  
Ring Opening Polymerization ◽  
Moderate Activity ◽  
Lactide Copolymers

The aim of this paper is to present a synthesis method of poly(ε-caprolactone) by the ring opening polymerization of ε-caprolactone catalyzed with nontoxic magnesium lactate. The results indicated that Mg(Lac)2 is a catalyst with moderate activity for the polymerization of ε-caprolactone. Effects of the catalyst and reaction temperatures on the microstructure of the ε-caprolactone and L-lactide copolymers were investigated by means of 13C-NMR spectroscopy. An increase in the reaction temperature enhances the role of transesterification and the extent of randomness.

The Role of Nitrogen Donors in Zinc Catalysts for Lactide Ring-Opening Polymerization

2016 ◽  
Vol 55 (18) ◽  
pp. 9445-9453 ◽  
Author(s):  
Tannaz Ebrahimi ◽  
Emiliya Mamleeva ◽  
Insun Yu ◽  
Savvas G. Hatzikiriakos ◽  
Parisa Mehrkhodavandi
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Nitrogen Donors

The Role of Alkoxide Initiator, Spin State, and Oxidation State in Ring-Opening Polymerization of ε-Caprolactone Catalyzed by Iron Bis(imino)pyridine Complexes

2018 ◽  
Vol 57 (4) ◽  
pp. 2064-2071 ◽  
Author(s):  
Manuel A. Ortuño ◽  
Büsra Dereli ◽  
Kayla R. Delle Chiaie ◽  
Ashley B. Biernesser ◽  
Miao Qi ◽  
...  
Keyword(s):  
Oxidation State ◽  
Spin State ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Pyridine Complexes
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