Block copolymers based on 2-methyl- and 2-phenyl-oxazoline by metallocene-mediated cationic ring-opening polymerization: synthesis and characterization

2016 ◽  
Vol 7 (16) ◽  
pp. 2821-2835 ◽  
Author(s):  
Maria-Evgenia Kourti ◽  
Eirini Fega ◽  
Marinos Pitsikalis
Keyword(s):  
Block Copolymers ◽  
Cationic Polymerization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Vinyl Ethers ◽  
Cationic Ring Opening Polymerization ◽  
Metallocene Complexes

The cationic polymerization of oxazolines, lactones and vinyl ethers can be efficiently promoted by metallocene complexes activated by floroaryl borates.

Formation of polyoxazoline-silica nanoparticles via the surface-initiated cationic polymerization of 2-methyl-2-oxazoline

2016 ◽  
Vol 7 (32) ◽  
pp. 5157-5168 ◽  
Author(s):  
G. Bissadi ◽  
R. Weberskirch
Keyword(s):  
Silica Nanoparticles ◽  
Cationic Polymerization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Hybrid Nanoparticles ◽  
Cationic Ring Opening Polymerization ◽  
Silica Hybrid

The fabrication of silica hybrid nanoparticles by a surface-initiated cationic ring-opening polymerization of poly(2-methyl-2-oxazoline)s has been described.

Cellulose-based polyacetals by direct and sensitized photocationic ring-opening polymerization of levoglucosenyl methyl ether

2020 ◽  
Vol 11 (43) ◽  
pp. 6884-6889
Author(s):  
Kerem Kaya ◽  
Tapas Debsharma ◽  
Helmut Schlaad ◽  
Yusuf Yagci
Keyword(s):  
Block Copolymers ◽  
Methyl Ether ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cationic Ring Opening Polymerization

Polyacetal homopolymers and block copolymers are produced by photochemically initiated cationic ring-opening polymerization (CROP).

A recyclable metal-free catalytic system for the cationic ring-opening polymerization of glycidol under ambient conditions

2021 ◽  
Author(s):  
Si Eun Kim ◽  
Hyun Ji Yang ◽  
Soonyoung Choi ◽  
Eunbyul Hwang ◽  
Minseong Kim ◽  
...  
Keyword(s):  
Catalytic System ◽  
Cationic Polymerization ◽  
Ring Opening ◽  
Environmentally Friendly ◽  
Ring Opening Polymerization ◽  
Ambient Conditions ◽  
Metal Free ◽  
Polymerization Condition ◽  
Polymer Topology ◽  
Cationic Ring Opening Polymerization

We developed a recyclable catalytic system for the metal-free cationic polymerization under ambient conditions, which provides mild and environmentally friendly polymerization condition as well as unique polymer topology.

Synthesis and Characterization of Hydroxy-telechelic Four-arm Star-shaped Oligo(tetrahydrofuran), Their Crosslinking, and Thermomechanical Investigation of the Poymer Network

2012 ◽  
Vol 1403 ◽  
Author(s):  
Ke-Ke Yang ◽  
J. Zotzmann ◽  
A. Lendlein ◽  
M. Behl
Keyword(s):  
Shape Memory ◽  
Ring Opening ◽  
Polymer Network ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Shape Memory Material ◽  
Molecular Weights ◽  
Initiation System ◽  
Cationic Ring Opening Polymerization

ABSTRACTHere the synthesis of hydroxy-telechelic four-arm star-shaped oligotetrahydrofuran (4PTHF) with controllable molecular weight was explored, which was perfomed as living cationic ring-opening polymerization of THF using pentaerythritol and trifluoromethanesulfonicanhydride as initiation system. The molecular weights of the 4PTHF were a function of the reaction time. A polymer network was prepared from the hydroxy-telechelic 4PTHF precursor by crosslinking with diisocyanate and the shape-memory properties were determined. High values for Rf and Rr > 98% were obtained even at high programmed elongations, which suggest the 4PTHF-network as a promising shape-memory material. These materials might have a great potential, as the upscaling of synthesis could be successfully demonstrated.

scholarly journals Cationic Polymerization of Hexamethylcyclotrisiloxane in Excess Water

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4402
Author(s):  
Quentin Barnes ◽  
Claire Longuet ◽  
François Ganachaud
Keyword(s):  
Cationic Polymerization ◽  
Ring Opening ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Short Communication ◽  
Ring Opening Polymerization ◽  
Chain Extension ◽  
Excess Water ◽  
End Groups ◽  
Cationic Ring Opening Polymerization

Ring-opening ionic polymerization of cyclosiloxanes in dispersed media has long been discovered, and is nowadays both fundamentally studied and practically used. In this short communication, we show some preliminary results on the cationic ring-opening polymerization of hexamethylcyclotrisiloxane (D3), a crystalline strained cycle, in water. Depending on the catalyst or/and surfactants used, polymers of various molar masses are prepared in a straightforward way. Emphasis is given here on experiments conducted with tris(pentafluorophenyl)borane (BCF), where high-molar polymers were generated at room temperature. In surfactant-free conditions, µm-sized droplets are stabilized by silanol end-groups of thus generated amphiphilic polymers, the latter of which precipitate in the course of reaction through chain extension. Introducing various surfactants in the recipe allows generating smaller emulsions in size with close polymerization ability, but better final colloidal stability, at the expense of low small cycles’ content. A tentative mechanism is finally proposed.

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