chain scission

Chain scission occurs in a polymer as a result of intense localized heat.

In the other degradation mechanism, the smaller molecules produced by chain scission frequently react across the chains.

The radiation-induced chain scission allows it to be more easily reground and reused.

Photobleaching, cross-linking, and chain scission are considerably reduced in the absence of oxygen.

(However, in highly oriented polymers, such moduli can be found and chain scission does occur.

For the model to predict a reversion point, it is necessary to treat the processes of chain scission and cross-linking as operating on separate sites.

In the second process, the smaller molecules produced by chain scission or reactive sites on large molecules react with other chains.

The photo-oxidation reactions include chain scission, cross linking and secondary oxidative reactions.

Chain scission increases with the presence of active Hydrogen molecules (for example, in water) as well as acids and alcohols.

If cross-linking occurs, either from chain scission or at active sites, the material is affected because of the relation between cross-link density and physical properties.

Chain scission is the cutting up of polymer chains, resulting in a higher concentration of distal tails.

Other polymers, such as poly(alpha-methylstyrene), undergo specific chain scission with breakage occurring only at the ends.

Extensive chain scission can substantially increase the crystallinity, density, stiffness and brittleness of the polyethylene, weakening the material.

Chain Scission is the breaking apart of molecular chains to produce required molecular sub-units from the chain.

The thermal degradation occurs primarily by a statistical chain scission; depolymerization and removal of low molecular weight compounds are playing only a minor role.

A free radical is formed here, and then reacts further with oxygen, followed by chain scission to yield aldehydes and carboxylic acids.

Under oxidative environment, SPES can undergo sulfonic group detachment and main chain scission.

Films of poly(3-alkylthiophenes) undergo simultaneous photobleaching, cross-linking, and chain scission when irradiated in air with UV or visible light.

Any phenomenon that causes polymeric chain scission, bond breaking, additive depletion, or extraction within the geomembrane must be considered as compromising to its long-term performance.

Cyclic loading can bring about failure in polymer due to: chain scission, built up heat due to hysteresis, recrystallization of material and cumulative crack generation.

Other polymers-like polyalphamethylstyrene-undergo 'specific' chain scission with breakage occurring only at the ends; they literally unzip or depolymerize to become the constituent monomers.

In polymers, an electron beam may be used on the material to induce effects such as chain scission (which makes the polymer chain shorter) and cross linking.

This chain scission lowers average molecular weight of the polymer, decreasing the number and strength of intermolecular bonds as well as the degree of entanglement.

These include methacrylate polymers that undergo photochemical chain scission and two-component (photosensitive solution inhibitor – alkali soluble matrix resin) systems.

Important contributions to weak-resist polymer chain scission (for positive resists) or crosslinking (for negative resists) come from electron forward scattering and backscattering.