Polymer chain scission
WebAnswer (1 of 3): Polymer chain scission refers to the breaking of chemical bonds within a polymer molecule, resulting in the formation of smaller polymer molecules. In contrast, … WebWe examine the thermally induced fracture of an unstrained polymer chain of discrete segments coupled by an anharmonic potential by means of molecular dynamics simulation with a Langevin thermostat.
Polymer chain scission
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WebFeb 1, 2000 · When used to enhance polymer properties or to sterilize polymer-based medical products, ionizing radiation interacts with polymers via two primary mechanisms: … Web6.1 Molecular Weight Control. Chain scission reduces the molecular weight of the macromolecules of a polymer and this finds some commercial applications in problems …
WebDetails. The kinetics of the process of random chain breaking for linear polymers is described by the equation:, where is the molar concentration of -mer and is the first-order … Web160 C (representing one type of defect at the polymer backbone); the second (scheme 2) by scissions at the chain-end initiation from vinylidene ends at around 270 C; and the last (scheme 3) by random scission within the polymer chain (at the weakest bonds). Fig. 1. Three chain scission steps leading to thermal degradation in acrylic polymers. 344
WebFeb 1, 2011 · A multi-scale approach is developed: polymer chain scission and oligomer production which occur at the molecular scale are modelled using a kinetic Monte Carlo … WebRadical attack does generate macroradicals along the polymer backbone, but following initial attack β-scission of the polymer chain forms other macroradicals. Intramolecular …
WebChain Scission. Electron beam processing can modify properties by creating controlled degradation – or chain scission – in certain materials. For example, PTFE can be processed to create a micropowder that can be brought to a specific particle size. Specific particle sizes are increasingly useful in products such as inks, coatings and ...
WebNov 17, 2024 · With data on both mechanophore activation and backbone scission, the mechanophore activation selectivity can be studied using the extent of ring-opening extrapolated to one scission cycle (ϕ), as defined by Craig, 8b which can be obtained from plots of gDCC ring-opening versus chain scission cycle, where ϕ is the slope of the … north madison county library elwoodWebPolymer oxidation has caused accidents involving medical devices. One of the oldest known failure modes is ozone cracking caused by chain scission when ozone gas attacks susceptible elastomers, such as natural rubber and nitrile rubber. They possess double bonds in their repeat units which are cleaved during ozonolysis. north madison christian church madison inWebChain scission and direct oxidation of the vinyl group lead to a very complex mixture of photoproducts. The scission of Sivinyl bond seems to be the main reaction. PDMS formed … how to scaffold in visual studioWebJan 12, 2024 · The fracture of rubbery polymer networks involves a series of molecular events, beginning with conformational changes along the polymer backbone and … north macon forsyth ga hotelsWebAt 254 nm the coumarin polyesters undergo polymer chain scission. Irradiation of the coumarin polyesters in solution at 350 nm results in … north madison church of christWebNov 28, 2024 · In this Perspective, we provide an overview of some of the fundamental concepts that have emerged in the field of polymer adhesion, discuss recent work, and … how to scald a chickenWebApr 1, 2024 · Universal scaling for polymer chain scission in turbulence. PubMed Central. Vanapalli, Siva A.; Ceccio, Steven L.; Solomon, Michael J. 2006-01-01. We report that … north madison ohio minute-by-minute weather