نتایج جستجو برای: ring opening metathesis polymerization

تعداد نتایج: 197458  

Journal: :Journal of the American Chemical Society 2016
L E Rosebrugh T S Ahmed V M Marx J Hartung P Liu J G López K N Houk R H Grubbs

The microstructures of polymers produced by ring-opening metathesis polymerization (ROMP) with cyclometalated Ru-carbene metathesis catalysts were investigated. A strong bias for a cis,syndiotactic microstructure with minimal head-to-tail bias was observed. In instances where trans errors were introduced, it was determined that these regions were also syndiotactic. Furthermore, hypothetical rea...

Journal: :Biomaterials science 2017
Ryan Baumgartner Diane Kuai Jianjun Cheng

We report the synthesis and characterization of high-molecular weight poly(l-glutamic acid) based brush polymers. Utilizing a combination of ring-opening metathesis polymerization of norbornene based monomers and ring-opening polymerization of γ-benzyl-l-glutamate N-carboxyanhydride, high-molecular weight γ-benzyl protected poly(l-glutamic acid) brush polymers are synthesized. Controlled and co...

Journal: :Macromolecular Chemistry and Physics 2021

A Blatter radical-containing polymer backbone is synthesized via copper-catalyzed azide-alkyne cycloaddition (CuAAC) and consecutive ring-opening metathesis polymerization. For this, an alkyne-functionalized radical used for the described CuAAC, yielding a polymerizable derivative of radical. The resulting electrochemically investigated in cyclic voltammetry experiments, paving way possible uti...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2010
jamshid mohammadi-rovshandeh majid abdouss sayed mehdi hoseini mohammad imani kamel ekhlasi-kazaj

in this work, new biodegradable abcba type pentablock copolymers with different mole ratio of l-lactide and ppdo-b-peg-b-ppdo triblock copolymer were synthesized and characterized. in the first step, ppdo-b-peg-b-ppdo triblock copolymer was synthesized via a ring-opening polymerization of p-dioxanone (pdo) monomer with poly (ethylene glycol) (peg) using stannous octoate (sn(oct)2) as the cataly...

Journal: :Organic letters 2008
Shane L Mangold Rachael T Carpenter Laura L Kiessling

The binding of a polymeric ligand to a cell surface receptor can promote its internalization. Methods to track and visualize multivalent ligands within a cell can give rise to new therapeutic strategies and illuminate signaling processes. We have used the features of the ring-opening metathesis polymerization (ROMP) to develop a general strategy for synthesizing multivalent ligands equipped wit...

Journal: :Organic letters 2002
Robert M Owen Jason E Gestwicki Travis Young Laura L Kiessling

[reaction: see text] Neoglycopolymers that vary in length and contain a single fluorescent reporter group were synthesized using ring-opening metathesis polymerization (ROMP). The utility of these materials is demonstrated by the development of a cellular binding assay for L-selectin, a cell surface protein that plays a role in inflammation. The data reveal that these multivalent ligands intera...

2015
Ileana Dragutan Valerian Dragutan Bogdan C Simionescu Albert Demonceau Helmut Fischer

This account critically surveys the field of side-chain transition metal-containing polymers as prepared by controlled living ring-opening metathesis polymerization (ROMP) of the respective metal-incorporating monomers. Ferrocene- and other metallocene-modified polymers, macromolecules including metal-carbonyl complexes, polymers tethering early or late transition metal complexes, etc. are here...

2017
Jingwei Fan Yannick P. Borguet Lu Su Tan P. Nguyen Hai Wang Xun He Jiong Zou Karen L. Wooley

Well-defined molecular brushes bearing polypeptides as side chains were prepared by a "grafting through" synthetic strategy with two-dimensional control over the brush molecular architectures. By integrating N-carboxyanhydride ring-opening polymerizations (NCA ROPs) and ring-opening metathesis polymerizations (ROMPs), desirable segment lengths of polypeptide side chains and polynorbornene brush...

2009
P. Longo C. Costabile F. Grisi G. Siniscalchi P. Ciambelli M. Sarno C. Leone D. Sannino Don Melillo

The synthesis of polynorbornene by ring opening metathesis polymerization (ROMP) in the presence of 1 2 generation Grubbs catalyst-functionalized nanotubes, is reported. A characterization of the 2 generation Grubbs catalystfunctionalized nanotubes was performed by TGA (Thermogravimetric Analysis) on-line connected with a quadrupole-mass spectrometer, in order to quantify the amount of catalyst...

Journal: :Organometallics 2011
Renee M Thomas Alexey Fedorov Benjamin K Keitz Robert H Grubbs

Highly thermally stable N-aryl,N-alkyl N-heterocyclic carbene (NHC) ruthenium catalysts were designed and synthesized for latent olefin metathesis. These catalysts showed excellent latent behavior toward metathesis reactions, whereby the complexes were inactive at ambient temperature and initiated at elevated temperatures, a challenging property to achieve with second generation catalysts. A st...

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