scholarly journals One‐Step Ring Opening Metathesis Block‐Like Copolymers and their Compositional Analysis by a Novel Retardation Technique

2020 ◽  
Vol 59 (32) ◽  
pp. 13597-13601
Author(s):  
Mohammad Yasir ◽  
Peng Liu ◽  
Jens C. Markwart ◽  
Oksana Suraeva ◽  
Frederik R. Wurm ◽  
...  
Keyword(s):  
Ring Opening ◽  
Compositional Analysis ◽  
One Step

scholarly journals One‐Step Ring Opening Metathesis Block‐Like Copolymers and their Compositional Analysis by a Novel Retardation Technique

2020 ◽  
Vol 132 (32) ◽  
pp. 13699-13703
Author(s):  
Mohammad Yasir ◽  
Peng Liu ◽  
Jens C. Markwart ◽  
Oksana Suraeva ◽  
Frederik R. Wurm ◽  
...  
Keyword(s):  
Ring Opening ◽  
Compositional Analysis ◽  
One Step

Novel Thermally Stable Epoxy-polyurethane Composites: Preparation, Characterization

2011 ◽  
Vol 239-242 ◽  
pp. 2742-2747
Author(s):  
Jing Lin ◽  
Qiu Zhuan Yang ◽  
Xiu Fang Wen ◽  
Zhi Qi Cai ◽  
Pi Hui Pi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ring Opening ◽  
Thermal Characteristics ◽  
Ring Opening Reaction ◽  
Tetramethylammonium Bromide ◽  
One Step ◽  
Novolac Epoxy ◽  
Polyurethane Composites ◽  
Novolac Epoxy Resins ◽  
Thermal Stability Of

A novel series of hydroxyl terminated bisphenol-A type novolac epoxy resins modified with propionic acid (MEP) were prepared by one-step ring-opening reaction process in the presence of tetramethylammonium bromide catalyst. The obtained MEP was characterized using FTIR,1HNMR analyses. In addition, Intercross-linked epoxy-polyurethane composites networks were also obtained by curing reaction among MEP, cross linker polyisocyanate IL1351 and phthalic anhydride. The thermal characteristics of the epoxy-polyurethane composites were determined by thermogravimetric analysis (TGA). The thermal stability of the cured MEP with different ring-opening rate and cured alkyd polyol A450 were compared. The results showed that the obtained epoxy-polyurethane composites had much better thermal stability than the conventional polyurethane system A450/IL1351, and the thermal stability of them was correlated to the content of MEP.

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.

scholarly journals A one pot one step combined radical and ring-opening route for the dual functionalization of starch in aqueous medium

2021 ◽  
Vol 254 ◽  
pp. 117399
Author(s):  
Julie Meimoun ◽  
Vincent Wiatz ◽  
René Saint-Loup ◽  
Julien Parcq ◽  
Adélina David ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Ring Opening ◽  
One Pot ◽  
One Step

scholarly journals Zirconium (IV) Acetylacetonate: Ring-Opening Initiator Mediating One-Step Synthesis of Biodegradable Polyacids

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Piotr Dobrzyński ◽  
Małgorzata Pastusiak ◽  
Joanna Jaworska ◽  
Bożena Kaczmarczyk ◽  
Michał Kwiecień ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Acid Derivative ◽  
Ring Opening ◽  
Active Catalyst ◽  
Ring Opening Polymerization ◽  
Cyclic Carbonate ◽  
Trimethylene Carbonate ◽  
Step Method ◽  
Polymerization Mechanism ◽  
One Step

Biodegradable polyacid is obtained in one-step ring-opening polymerization (ROP) of carboxylic-acid-functionalized six-membered cyclic carbonate mediated with zirconium (IV) acetylacetonate. Exemplary copolymers with L,L-lactide are described as well. Moreover, zirconium (IV) acetylacetonate is found to be active catalyst of trimethylene carbonate (TMC) ROP in presence of carboxylic acid yielding PTMC end-capped with the acid derivative. Polymerization mechanism is hypothesized demonstrating possibilities of the method in work-saving polycation synthesis and one-step method of conjugate synthesis of well-known biocompatible polyesters and polycarbonates.

Hydrogenolysis of N-protected aminooxetanes over palladium: An efficient method for a one-step ring opening and debenzylation reaction

2011 ◽  
Vol 339 (1-2) ◽  
pp. 32-36 ◽  
Author(s):  
Ervin Kovács ◽  
Angelika Thurner ◽  
Ferenc Farkas ◽  
Ferenc Faigl ◽  
László Hegedűs
Keyword(s):  
Efficient Method ◽  
Ring Opening ◽  
One Step

Hydrogenolysis of O-protected hydroxyoxetanes over palladium: An efficient method for a one-step ring opening and detritylation reaction

2009 ◽  
Vol 10 (5) ◽  
pp. 635-639 ◽  
Author(s):  
Ferenc Farkas ◽  
Angelika Thurner ◽  
Ervin Kovács ◽  
Ferenc Faigl ◽  
László Hegedűs
Keyword(s):  
Efficient Method ◽  
Ring Opening ◽  
One Step
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