Synthesis of Polyethers from Epoxides via Binary Organocatalyst System

The development of “metal-free” catalyst systems with high efficiency for the ring-opening polymerization (ROP) of epoxides, providing polyethers with controlled molecular weights and dispersity as well as desired main-chain sequence...

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One-Pot Synthesis of Star Copolymers by the Combination of Metal-Free ATRP and ROP Processes

Polymers ◽

10.3390/polym11101577 ◽

2019 ◽

Vol 11 (10) ◽

pp. 1577 ◽

Cited By ~ 4

Author(s):

Gorkem Yilmaz

Keyword(s):

Visible Light Irradiation ◽

Ring Opening ◽

Reaction Medium ◽

Ring Opening Polymerization ◽

One Pot ◽

Metal Free ◽

Molecular Weights ◽

Star Copolymers ◽

Living Polymerizations ◽

Chromatographic Evidence

A completely metal-free strategy is demonstrated for the preparation of star copolymers by combining atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) for the syntheses of block copolymers. These two different metal-free controlled/living polymerizations are simultaneously realized in one reaction medium in an orthogonal manner. For this purpose, a specific core with functional groups capable of initiating both polymerization types is synthesized. Next, vinyl and lactone monomers are simultaneously polymerized under visible light irradiation using specific catalysts. Spectral and chromatographic evidence demonstrates the success of the strategy as star copolymers are synthesized with controlled molecular weights and narrow distributions.

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Preparation and mechanical properties of PCL-based polyurethanes as potential biomaterials for short-term applications

e-Polymers ◽

10.1515/epoly.2010.10.1.1661 ◽

2010 ◽

Vol 10 (1) ◽

Cited By ~ 1

Author(s):

Marcin Sobczak ◽

Cezary Dębek ◽

Piotr Goś

Keyword(s):

Mechanical Properties ◽

Thermal Properties ◽

Ring Opening ◽

Soft Segment ◽

Ring Opening Polymerization ◽

Mechanical And Thermal Properties ◽

Short Term ◽

Metal Free ◽

Molecular Weights

AbstractA series of polyurethanes (PURs) were prepared by metal-free method, containing polycaprolactone (PCL) as the soft segment with molecular weights of 1600, 2400 and 2600. PCL was obtained by the ring-opening polymerization of ε- caprolactone in the presence L-alanine and L-phenyloalanine. The structure of synthesized oligoesters and PURs were spectroscopically confirmed. The molecular weights, mechanical and thermal properties of the obtained materials were reported.

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Precise synthesis of α,ω-chain-end functionalized poly(dimethylsiloxane) with azide groups based on metal-free ring-opening polymerization and a quantitative azidation reaction

Reactive and Functional Polymers ◽

10.1016/j.reactfunctpolym.2021.105009 ◽

2021 ◽

pp. 105009

Author(s):

Kei-ichiro Sato ◽

Souki Ito ◽

Tomoya Higashihara ◽

Keita Fuchise

Keyword(s):

Ring Opening ◽

Ring Opening Polymerization ◽

Free Ring ◽

Metal Free

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Synthesis of metal-free poly(1,4-dioxan-2-one) by enzyme-catalyzed ring-opening polymerization

Journal of Polymer Science Part A Polymer Chemistry ◽

10.1002/(sici)1099-0518(20000501)38:9<1560::aid-pola20>3.0.co;2-f ◽

2000 ◽

Vol 38 (9) ◽

pp. 1560-1567 ◽

Cited By ~ 60

Author(s):

Haruo Nishida ◽

Mitsuhiro Yamashita ◽

Masumi Nagashima ◽

Takeshi Endo ◽

Yutaka Tokiwa

Keyword(s):

Ring Opening ◽

Ring Opening Polymerization ◽

Metal Free

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Construction of polyphosphoesters with the main chain of rigid backbones and stereostructures via organocatalyzed ring-opening polymerization

Polymer Chemistry ◽

10.1039/d0py00262c ◽

2020 ◽

Vol 11 (20) ◽

pp. 3475-3480

Author(s):

Yu-Jia Zheng ◽

Guan-Wen Yang ◽

Bo Li ◽

Guang-Peng Wu

Keyword(s):

Ring Opening ◽

Main Chain ◽

Catalyst System ◽

Ring Opening Polymerization ◽

System P ◽

Organic Catalyst

A highly stereoregular polyphosphoester with a rigid cyclohexylene structure in the main chain was constructed via ring-opening polymerization (ROP) in the presence of an organic catalyst system.

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Anionic Ring-Opening Polymerization Simulations for Hyperbranched Polyglycerols with Defined Molecular Weights

Macromolecules ◽

10.1021/ma401712w ◽

2013 ◽

Vol 46 (21) ◽

pp. 8458-8466 ◽

Cited By ~ 16

Author(s):

Florian Paulus ◽

Maximilian E. R. Weiss ◽

Dirk Steinhilber ◽

Anatoly N. Nikitin ◽

Christof Schütte ◽

...

Keyword(s):

Ring Opening ◽

Ring Opening Polymerization ◽

Molecular Weights ◽

Anionic Ring

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High Efficiency Organic Lewis Pair Catalyst for Ring-Opening Polymerization of Epoxides with Chemoselectivity

Macromolecules ◽

10.1021/acs.macromol.8b01852 ◽

2018 ◽

Vol 51 (20) ◽

pp. 8286-8297 ◽

Cited By ~ 31

Author(s):

Ye Chen ◽

Jizhou Shen ◽

Shan Liu ◽

Junpeng Zhao ◽

Yucai Wang ◽

...

Keyword(s):

Ring Opening ◽

High Efficiency ◽

Ring Opening Polymerization

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Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.6.59 ◽

2010 ◽

Vol 6 ◽

Cited By ~ 9

Author(s):

Olubummo Adekunle ◽

Susanne Tanner ◽

Wolfgang H Binder

Keyword(s):

Dicarboxylic Acid ◽

Ring Opening ◽

Laser Desorption ◽

Ring Opening Polymerization ◽

Ionization Mass ◽

Laser Desorption Ionization ◽

Block Copolymerization ◽

Molecular Weights ◽

Ionization Mass Spectroscopy ◽

Rate Of Polymerization

We report on the block copolymerization of two structurally different norbornene monomers (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid dimethylester (7), and (±)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid bis(1-oxyl-2,2,6,6-tetramethyl-piperidin-4-yl) ester (9) using ruthenium based Grubbs’ type initiators [(PCy3)2Cl2Ru(benzylidene)] G1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(benzylidene)] G2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)2Cl2Ru(benzylidene)] G3 (py = pyridine or 3-bromopyridine) and Umicore type initiators [(PCy3)2Cl2Ru(3-phenylinden-1-ylidene)] U1 (PCy3 = tricyclohexylphosphine), [(H2IMes)(PCy3)Cl2Ru(3-phenylinden-1-ylidene)] U2 (H2IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H2IMes)(py)Cl2Ru(3-phenylinden-1-ylidene)] U3 (py = pyridine or 3-bromopyridine) via ring opening polymerization (ROMP). The crossover reaction and the polymerization kinetics were investigated using matrix assisted laser desorption ionization mass spectroscopy (MALDI-TOF) and nuclear magnetic resonance (NMR), respectively. MALDI showed that there was a complete crossover reaction after the addition of 25 equivalents of the second monomer. NMR investigation showed that U3 gave a faster rate of polymerization in comparison to U1. The synthesis of block copolymers with molecular weights up to M n = 31 000 g/mol with low polydispersities (M w/M n = 1.2) is reported.

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