Novel High Molecular Weight Aromatic Fluorinated Polymers from One-Pot, Metal-Free Step Polymerizations

2013 ◽  
Vol 46 (18) ◽  
pp. 7245-7256 ◽  
Author(s):  
Lilian I. Olvera ◽  
Maria T. Guzmán-Gutiérrez ◽  
Mikhail G. Zolotukhin ◽  
Sergei Fomine ◽  
Jorge Cárdenas ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Fluorinated Polymers ◽  
One Pot ◽  
Metal Free

A metal-free method for ultra-high molecular weight polyacrylonitrile under dimethyl sulfoxide

Polymer ◽  
2020 ◽  
pp. 123245
Author(s):  
Guanchun Rui ◽  
Qiang Lv ◽  
Jianmin Lu ◽  
Tianyu Wu ◽  
Shuai Zhao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Dimethyl Sulfoxide ◽  
High Molecular Weight ◽  
Metal Free ◽  
Ultra High Molecular Weight

scholarly journals New 1,2,3-Triazole Containing PolyestersviaClick Step-Growth Polymerization and Nanoparticles Made of Them

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Tengiz Kantaria ◽  
Temur Kantaria ◽  
Giorgi Titvinidze ◽  
Giuli Otinashvili ◽  
Nino Kupatadze ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Sodium Azide ◽  
Dicarboxylic Acids ◽  
Solution Concentration ◽  
One Pot ◽  
Bromoacetic Acid ◽  
Aliphatic Polyesters ◽  
Step Growth ◽  
Step Growth Polymerization

High-molecular-weight AA-BB-type aliphatic polyesters were synthesizedviaCu(I)-catalyzed click step-growth polymerization (SGP) following a new synthetic strategy. The synthesis was performed between diyne and diazide monomers in an organic solvent as one pot process using three components and two stages. The dipropargyl esters of dicarboxylic acids (component 1) were used as diyne monomers, di-(bromoacetic acid)-alkylene diesters (component 2) were used as precursors of diazide monomers, and sodium azide (component 3) was used for generating diazide monomers. The SGP was carried out in two steps: at Step  1 dibromoacetates interacted with two moles of sodium azide resulting in diazide monomers which interacted in situ with diyne monomers at Step  2 in the presence of Cu(I) catalyst. A systematic study was done for optimizing the multiparameter click SGP in terms of the solvent, duration of both Step  1 and Step  2, solution concentration, catalyst concentration, catalyst and catalyst activator (ligand) nature, catalyst/ligand mole ratio, and temperature of both steps of the click SGP. As a result, high-molecular-weight (MWup to 74 kDa) elastic film-forming click polyesters were obtained. The new polymers were found suitable for fabricating biodegradable nanoparticles, which are promising as drug delivery containers in nanotherapy.

High molecular weight polyethylenes of narrow dispersity promoted using bis(arylimino)cyclohepta[b]pyridine-cobalt catalysts ortho-substituted with benzhydryl & cycloalkyl groups

2020 ◽  
Vol 49 (15) ◽  
pp. 4774-4784 ◽  
Author(s):  
Mingyang Han ◽  
Qiuyue Zhang ◽  
Ivan I. Oleynik ◽  
Hongyi Suo ◽  
Gregory A. Solan ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Cobalt Catalysts ◽  
One Pot ◽  
Molecular Weights ◽  
Highly Active

The depicted cobalt precatalysts, prepared using a one pot strategy, can form highly active catalysts at temperatures between 50 °C and 60 °C and can mediate the formation of linear PEs displaying high molecular weights and narrow dispersities.

One-Pot Synthesis of High Molecular Weight Synthetic Heteroprotein Dimers Driven by Charge Complementarity Electrostatic Interactions

2014 ◽  
Vol 79 (20) ◽  
pp. 9594-9602 ◽  
Author(s):  
David Hvasanov ◽  
Ekaterina V. Nam ◽  
Joshua R. Peterson ◽  
Dithepon Pornsaksit ◽  
Jörg Wiedenmann ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Electrostatic Interactions ◽  
One Pot ◽  
One Pot Synthesis

Use of 4-piperidones in one-pot syntheses of novel, high-molecular-weight linear and virtually 100%-hyperbranched polymers

2009 ◽  
pp. 4408 ◽  
Author(s):  
Alfredo R. Cruz ◽  
Mikhail G. Zolotukhin ◽  
Salvador L. Morales ◽  
Jorge Cardenas ◽  
Gerardo Cedillo ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Hyperbranched Polymers ◽  
One Pot

scholarly journals Spatially Controlled Highly Branched Vinylsilicones

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 859
Author(s):  
Mengchen Liao ◽  
Yang Chen ◽  
Michael A. Brook
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Functional Groups ◽  
Viscoelastic Behavior ◽  
Complete Conversion ◽  
One Pot ◽  
Molecular Weights ◽  
Silicone Polymers

Branched silicones possess interesting properties as oils, including their viscoelastic behavior, or as precursors to controlled networks. However, highly branched silicone polymers are difficult to form reliably using a “grafting to” strategy because functional groups may be bunched together preventing complete conversion for steric reasons. We report the synthesis of vinyl-functional highly branched silicone polymers based, at their core, on the ability to spatially locate functional vinyl groups along a silicone backbone at the desired frequency. Macromonomers were created and then polymerized using the Piers–Rubinsztajn reaction with dialkoxyvinylsilanes and telechelic HSi-silicones; molecular weights of the polymerized macromonomers were controlled by the ratio of the two reagents. The vinyl groups were subjected to iterative (two steps, one pot) hydrosilylation with alkoxysilane and Piers–Rubinsztajn reactions, leading to high molecular weight, highly branched silicones after one or two iterations. The vinyl-functional products can optionally be converted to phenyl/methyl-modified branched oils or elastomers.

scholarly journals Synthesis of High Molecular Weight Stereo-Di-Block Copolymers Driven by a Co-Initiator Free Catalyst

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 232
Author(s):  
Carmen Moya-Lopez ◽  
Ivan Bravo ◽  
José A. Castro-Osma ◽  
David Chapron ◽  
Patrice Bourson ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Diblock Copolymers ◽  
Average Molecular Weight ◽  
Kinetic Studies ◽  
Scanning Calorimetry ◽  
One Pot ◽  
Mechanism Of Reaction ◽  
Sequential Addition ◽  
The One

Stereo-diblock copolymers of high molecular weight polylactide (PLA) were synthetized by the one pot-sequential addition method assisted by a heteroscorpionate catalyst without the need of a co-initiator. The alkyl zinc organometallic heteroscorpionate derivative (Zn(Et)(κ3-bpzteH)] (bpzteH = 2,2-bis(3,5-dimethylpyrazol-1-yl)-1-para-tolylethoxide) proved to assist in the mechanism of reaction following a coordination-insertion process. Kinetic studies along with the linear correlation between monomer and number average molecular weight (Mn) conversion, and the narrow polydispersities supported the truly living polymerization character of the initiator, whereas matrix-assisted laser desorption/Ionization-time of flight (MALDI-TOF) studies showed a very low order of transesterification. The high stereo-control attained for the afforded high molecular weight derivatives was revealed by homonuclear decoupled 1H NMR spectra and polarimetry measurements. The nanostructure of the PLA derivatives was studied by both wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) and the stereocomplex phase of the PLA stereo-diblock copolymers was successfully identified.

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