نتایج جستجو برای: ring opening metathesis polymerization

تعداد نتایج: 197458  

Journal: :Macromolecules 2009
Matthew J Allen Kittikhun Wangkanont Ronald T Raines Laura L Kiessling

A new strategy is presented for the synthesis of graft copolymers using only the ring-opening metathesis polymerization (ROMP). From a ROMP-derived main chain, pendant maleimide functional groups are converted into norbornene moieties via a Diels-Alder reaction with cyclopentadiene. The norbornene groups serve as sites of initiation, and subsequent ROMP from the main chain yields graft copolyme...

2017
Stella Hurtley

Forcing polymers to be semiconductors In mechanochemistry, the application of force to a polymer is used to pry open specific chemical bonds. Chen et al. leveraged this technique to produce semiconducting blocks of polyacetylene in an insulating precursor. Ring-opening metathesis polymerization tethered together a series of fused fourcarbon rings, reminiscent of the unusual ladderane membrane l...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2013
Hafiz Ashraful Haque Soutarou Kakehi Mitsuo Hara Shusaku Nagano Takahiro Seki

High-density polynorbornene azobenzene liquid-crystalline brushes are synthesized on quartz substrates by surface-initiated ring-opening metathesis polymerization (SI-ROMP) using Grubbs third-generation catalyst. The grafting process is controlled over the thickness of the brush from a solid-supported substrate in a stoichiometric manner. A highly ordered liquid-crystal arrangement was formed f...

Journal: :Angewandte Chemie 2021

Stereochemistry can have a profound impact on polymer and materials properties. Unfortunately, straightforward methods for realizing high levels of stereocontrolled polymerizations are often challenging to achieve. In departure from traditional metal-mediated ring-opening metathesis polymerization (ROMP), we discovered remarkably simple method controlling alkene stereochemistry in photoredox me...

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