What is beta scission reaction?
Beta scission is an important reaction in the chemistry of thermal cracking of hydrocarbons and the formation of free radicals. Free radicals are formed upon splitting the carbon-carbon bond. Free radicals are extremely reactive and short-lived.
What is scission in chemistry?
Scission (chemistry), bond cleavage, the splitting of chemical bonds. Chain scission, the degradation of a polymer main chain.
How does scission occur?
Chain scission is a term used in polymer chemistry describing the degradation of a polymer main chain. It is often caused by thermal stress (heat) or ionizing radiation (e.g. light, UV radiation or gamma radiation), often involving oxygen.
What is oligo polymer?
Oligomers are low molecular weight polymers comprising a small number of repeat units whose physical properties are significantly dependent on the length of the chain. Oligomers are essentially intermediates of the polymerization reaction that find wide, direct applications in material science.
What causes main chain scission?
What is monomer and oligomer?
A monomer can be defined as a molecule that can combine with other molecules to form an oligomer or polymer. An oligomer can be described as a molecular complex comprised of a few monomer units.
Why are oligomers important?
Oligomers are short chains of monomers. They are a key ingredient in UV gels, giving give it its basic properties (shininess, rigidity) after curing.
What happens to viscosity during main chain scission?
Main chain scission, cross-linking, point mutations, change in viscosity. How is solution viscosity used to determine the macromolecular damage? Viscosity of the solution increases after a high dose of radiation of macromolecules. It is a measure of the degree of main-chain scission of macromolecules.
What is unzipping of polymers?
In the case of chain-end scission, monomers are released. This process is known as unzipping, depropagation or end-chain depolymerization. Random main chain scission, on the other hand, leads to the formation of both monomers and oligomers (short chains with ten or fewer monomers).
What is meant by polymerized?
1 : a chemical reaction in which two or more molecules combine to form larger molecules that contain repeating structural units — compare association sense 5. 2 : reduplication of parts in an organism.
What oligomer means?
Definition of oligomer : a polymer or polymer intermediate containing relatively few structural units.
How oligomers are formed?
They may be made from monomers by linking them together, or by separation from the higher fractions of crude oil. Polybutene is an oligomeric oil used to make putty. Oligomerization is a chemical process that converts monomers to macromolecular complexes through a finite degree of polymerization.
What are monomers and oligomers?
What is degradation temperature?
Thermal degradation occurs when the polymer changes its properties under the influence of increased temperature. Initially, it causes the migration of low-molecular-weight additives in aging materials, if any are present.
How do polymers break down?
Polymers are broken down into monomers via hydrolysis reactions, in which a bond is broken, or lysed, by addition of a water molecule.
What is depolymerization of actin?
Introduction to Actin Filament Depolymerization Actin filament depolymerization ensures the turnover of actin filaments within these structures and maintains a pool of actin monomers that permits the continual restructuring and growth of the actin cytoskeleton.