A new strategy for the one-step synthesis of block copolymers through simultaneous free radical and ring opening polymerizations using a dual-functional initiator

Polymer ◽  
2005 ◽  
Vol 46 (5) ◽  
pp. 1561-1565 ◽  
Author(s):  
Chih-Feng Huang ◽  
Shiao-Wei Kuo ◽  
Hsin-Fang Lee ◽  
Feng-Chih Chang
Keyword(s):  
Free Radical ◽  
Block Copolymers ◽  
Ring Opening ◽  
Dual Functional ◽  
New Strategy ◽  
One Step ◽  
The One

Synthesis of Nanosized Polymer Particles in Nonaqueous Emulsion

2013 ◽  
Vol 1546 ◽  
Author(s):  
Robert Dorresteijn ◽  
Robert Haschick ◽  
Kevin Müller ◽  
Markus Klapper ◽  
Klaus Müllen
Keyword(s):  
Ring Opening ◽  
Continuous Phase ◽  
Size Distributions ◽  
Aqueous Emulsion ◽  
Long Term Stability ◽  
Dispersed Particles ◽  
One Step ◽  
Moisture Sensitive ◽  
The One

ABSTRACTIn nonaqueous emulsion, moisture-sensitive polymerizations are performed in order to generate nanoparticles, which are not accessible by common aqueous emulsion polymerization. A nonaqueous emulsion, consisting of two immiscible aprotic organic solvents, is stabilized by amphiphilic block copolymers, such as PIb-PEO or PIb-PMMA copolymer, and lead to formation of nanosized dispersed droplets. They act as dispersed “nanoreactors” for the one-step synthesis of poly(urethane) nanoparticles in a polyadditon reaction as well as poly(L-lactide) nanoparticles through ring-opening polymerization, catalyzed by a moisture-sensitive catalyst. The well-dispersed particles possess average diameters below 100 nm and have narrow size distributions owing to the long-term stability of the dispersed droplets in the continuous phase.

One-step synthesis of triarm block copolymers by simultaneous atom transfer radical and ring-opening polymerization

2015 ◽  
Vol 73 (6) ◽  
pp. 1497-1513 ◽  
Author(s):  
Temel Öztürk ◽  
Mahmut Yavuz ◽  
Melahat Göktaş ◽  
Baki Hazer
Keyword(s):  
Block Copolymers ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Atom Transfer ◽  
One Step

scholarly journals An integrated dual functional recognition/amplification bio-label for the one-step impedimetric detection of Micro-RNA-21

2017 ◽  
Vol 92 ◽  
pp. 154-161 ◽  
Author(s):  
Sawsen Azzouzi ◽  
Wing Cheung Mak ◽  
Kamalodin Kor ◽  
Anthony P.F. Turner ◽  
Mounir Ben Ali ◽  
...  
Keyword(s):  
Micro Rna ◽  
Dual Functional ◽  
One Step ◽  
The One

scholarly journals Diblock dialternating terpolymers by one-step/one-pot highly selective organocatalytic multimonomer polymerization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jiaxi Xu ◽  
Xin Wang ◽  
Nikos Hadjichristidis
Keyword(s):  
Ring Opening ◽  
Polymeric Materials ◽  
Structural Diversity ◽  
One Pot ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
One Step ◽  
The One

AbstractThe synthesis of well-defined block copolymers from a mixture of monomers without additional actions (“one-pot/one-step”) is an ideal and industrially valuable method. In addition, the presence of controlled alternating sequences in one or both blocks increases the structural diversity of polymeric materials, but, at the same time, the synthetic difficulty. Here we show that the “one-pot/one-step” ring-opening terpolymerization of a mixture of three monomers (N-sulfonyl aziridines; cyclic anhydrides and epoxides), with tert-butylimino-tris(dimethylamino)phosphorene (t-BuP1) as a catalyst, results in perfect diblock dialternating terpolymers having a sharp junction between the two blocks, with highly-controllable molecular weights and narrow molecular weight distributions (Ð < 1.08). The organocatalyst switches between two distinct polymerization cycles without any external stimulus, showing high monomer selectivity and kinetic control. The proposed mechanism is based on NMR, in-situ FTIR, SEC, MALDI-ToF, reactivity ratios, and kinetics studies.

A Study on the Rearrangement of Dialkyl 1-Aryl-1-hydroxymethylphosphonates to Benzyl Phosphates

2020 ◽  
Vol 24 (4) ◽  
pp. 465-471 ◽  
Author(s):  
Zita Rádai ◽  
Réka Szabó ◽  
Áron Szigetvári ◽  
Nóra Zsuzsa Kiss ◽  
Zoltán Mucsi ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Room Temperature ◽  
Phase Transfer ◽  
One Pot ◽  
Substrate Dependence ◽  
Triethylbenzylammonium Chloride ◽  
One Step ◽  
The Pudovik Reaction ◽  
The One ◽  
Solid Liquid

The phospha-Brook rearrangement of dialkyl 1-aryl-1-hydroxymethylphosphonates (HPs) to the corresponding benzyl phosphates (BPs) has been elaborated under solid-liquid phase transfer catalytic conditions. The best procedure involved the use of triethylbenzylammonium chloride as the catalyst and Cs2CO3 as the base in acetonitrile as the solvent at room temperature. The substrate dependence of the rearrangement has been studied, and the mechanism of the transformation under discussion was explored by quantum chemical calculations. The key intermediate is an oxaphosphirane. The one-pot version starting with the Pudovik reaction has also been developed. The conditions of this tandem transformation were the same, as those for the one-step HP→BP conversion.

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