(redirected from scissions)
Also found in: Dictionary, Thesaurus, Medical.
References in periodicals archive ?
Before and after E-beam exposure, molecular weight was determined for each SBCs and homopolymer of polyisoprene and polybutadiene using size exclusion chromatography (SEC) to ascertain whether chain scission or crosslinking were the predominate reaction pathway.
Comparing predried and non predried powders with a storage time of 64 h shows reduced further crystallization as well as chain scission if water is excluded from the powder, Fig.
The viscosity evolution is the result of a competition between PC chains scissions and the grafting of PC chains onto SEBS.
In polymers, formation of microvoids is always caused by scission of covalent bonds between monomers in macromolecules.
This increase is mainly due to the molecular chain scissions in both interphase and amorphous phase, which then crystallize.
However, there are almost four times more carbonyls than chain scissions that shows the existence of chemical events forming carbonyls without chain scission.
1] specific of terminal ketones, which can be explained by chain scission as confirmed by SEC analysis as shown below.
Chain scissions followed, and the small molecules thus formed could then recrystallize.
These differences are because of the fact that the orientation inhibits the ability of polymer chains to twist into the conformation necessary for the type II scission.
Some molecular scissions occur after exposition to UV radiation and the most oriented side (side B) relaxes in a greater extent than the other side resulting in deformation.
Degradation also causes a drastic change in the mechanical properties of the polymer, accompanied by a decrease or increase in its average molecular weight as a result of either chain scission or crosslinking of the polymer molecules, respectively [6].
Irradiated polymers generally undergo two types of reactions, that is, cross-linking and chain scission, and both of these reactions can significantly alter the physical properties of a polymer [20, 21].