What is oligomerization process?
Oligomerization is a chemical process that converts monomers to macromolecular complexes through a finite degree of polymerization. Telomerization is an oligomerization carried out under conditions that result in chain transfer, limiting the size of the oligomers.
What is oligomerization of ethylene?
The oligomerization of olefins such as ethylene and butylenes is another route for increasing the carbon number for the production of motor fuels. The ethylene and butylenes are derived by dehydration of bioethanol and biobutanol, respectively, in presence of solid acid catalysts.
What is oligomer in 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 is polymerization process?
Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.
What is the difference between oligomerization and polymerization?
The key difference between oligomer and polymer is that the oligomer forms when few monomers undergo polymerization whereas the polymer forms when a large number of monomers undergo polymerization. Polymers are large macromolecules that contain a large number of repeating units; we call them monomers.
What is polymerization reaction in chemistry?
chemical reaction. Give Feedback External Websites. Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer.
What is difference between polymer and oligomer?
A polymer is a molecule of high molecular weight, the structure of which essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low molecular weight. An oligomer is a molecule that consists of a few monomer units.
What is an example of polymerization?
Polymerization that occurs through the coupling of monomers using their multiple bonds is called addition polymerization. The simplest example involves the formation of polyethylene from ethylene molecules. Polyethylene – films, packaging, bottles. Polypropylene – kitchenware, fibers, appliances.
What are 2 types of polymerization?
There are two general types of polymerization reactions: addition polymerization and condensation polymerization.
What are two methods of polymerization?
Polymerization Reactions There are two basic types of polymerization, chain-reaction (or addition) and step-reaction (or condensation) polymerization.
What is degree of polymerization in chemistry?
The degree of polymerization (DP or Xn) is defined as the number of monomer units in the polymer. It is calculated as the ratio of molecular weight of a polymer and molecular weight of the repeat unit. Number average DP and weight average DP are the two main types used for measuring the DP.
What is polymerization and its mechanism?
The mechanism of polymerization used in the synthesis of polymers allows for the classification of the latter into two major classes, namely, addition and condensation polymers. The former kind is produced by the repeated and sequential addition of monomers without the loss of a smaller molecule during the process.
Why is oligomerization of ethylene so difficult?
Because oligomerizationof ethylene is difficult, alternative pathways have been developed that first convert the ethylene to an intermediate olefin prior to oligomerization to jet fuel-length olefins.
What is the temperature and pressure of oligomerization?
Oligomerizationreaction occurs at 423K–773K and 1–50 bar [66]. It is an exothermic reaction that releases 1.046–1.381 kJ/g of olefin [66]. Low temperature (below 573K) and high pressure (30–50 bar) favors diesel-range hydrocarbons, while high temperature and ambient pressure are suitable for gasoline-range hydrocarbons.
Is the oligomerization of precursor molecules a general mechanism?
Thus, oligomerization of precursor molecules appears to be a general mechanism for the activation of both apoptosis initiator and inflammatory procaspases. Publication types
How is oligomerization used in the biolubricant area?
Oligomerization or branching of plant oils and their derivatives to form estolides has been developed for use in biolubricant area (Cermak and Isbell, 2001 ). The estolides have proved to negate poor cold-temperature properties and thermal oxidation stability associated with plant oil–based lubricants.
