About: Degenerative chain transfer

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In polymer chemistry, degenerative chain transfer (also called degenerate chain transfer) is a process that can occur in a radical polymerization whereby reactivity of active centres are changed, hence significantly influencing the molecular weight distribution of the resulting product. In chain polymerization processes it is observed that during the chemical reactions an active centre on a growing chain is transferred from a growing macromolecule - P• - or oligomer to another molecule (transfer agent XR) or to another site on the same molecule. P• + XR → PX + R•

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rdf:type	yago:ChemicalProcess113446390 yago:ChemicalReaction113447361 yago:NaturalProcess113518963 yago:PhysicalEntity100001930 yago:Process100029677 Election yago:WikicatPolymerizationReactions
rdfs:label	Degenerative chain transfer (en)
rdfs:comment	In polymer chemistry, degenerative chain transfer (also called degenerate chain transfer) is a process that can occur in a radical polymerization whereby reactivity of active centres are changed, hence significantly influencing the molecular weight distribution of the resulting product. In chain polymerization processes it is observed that during the chemical reactions an active centre on a growing chain is transferred from a growing macromolecule - P• - or oligomer to another molecule (transfer agent XR) or to another site on the same molecule. P• + XR → PX + R• (en)
dcterms:subject	Polymerization reactions
Wikipage page ID	39968404 (xsd:integer)
Wikipage revision ID	1081374693 (xsd:integer)
Link from a Wikipage to another Wikipage	Degree of polymerization Oligomer Living free radical polymerization Macromolecule Active center (polymer science) Polymerization reactions Dispersity Living polymerization International Union of Pure and Applied Chemistry Polymer chemistry RAFT Reversible deactivation radical polymerization Molecular weight distribution
sameAs	Degenerative chain transfer Degenerative chain transfer Degenerative chain transfer Degenerative chain transfer
dbp:wikiPageUsesTemplate	dbt:Quote_box dbt:Reflist
align	right (en)
quote	Chain-transfer reaction that generates a new chain carrier and a new chain-transfer agent with the same reactivity as the original chain carrier and chain-transfer agent. (en)
title	IUPAC definition for degenerative chain transfer (en)
width	40.0 (perCent)
has abstract	In polymer chemistry, degenerative chain transfer (also called degenerate chain transfer) is a process that can occur in a radical polymerization whereby reactivity of active centres are changed, hence significantly influencing the molecular weight distribution of the resulting product. In chain polymerization processes it is observed that during the chemical reactions an active centre on a growing chain is transferred from a growing macromolecule - P• - or oligomer to another molecule (transfer agent XR) or to another site on the same molecule. P• + XR → PX + R• This transfer involves termination of the initially growing chain to the completed macromolecule PX, where X denotes one end-group of the macromolecule. The example shows that the growing macromolecule as well as the transfer agent are consumed during this process. However, there are also chain transfer reactions that generate new chain carriers and new chain transfer agents at the same time with significant consequences for the distribution of the (average) molecular weight distribution, the dispersity Đ and the (average) degree of polymerization of the product. These chain transfer reactions are called degenerative chain transfer reactions and are observed, for example in RAFT-, ITRP-, or TERP- processes. RAFT = reversible addition-fragmentation chain transfer polymerization; ITRP = iodine-transfer polymerization; TERP = telluride-mediated polymerization. These polymerization techniques belong to the class of reversible deactivation radical polymerizations (RDRP) that show some characteristics of a living polymerization, however, they must not be addressed as living polymerizations because true living polymerizations are characterized by the absence of any termination reaction. In this sense, a chain-transfer agent RX is a substance that is able to react with a chain carrier by a reaction in which the original chain P• is deactivated and a new chain carrier R• is generated, as shown above. (en)
gold:hypernym	Process
prov:wasDerivedFrom	wikipedia-en:Degenerative_chain_transfer?oldid=1081374693&ns=0
page length (characters) of wiki page	3738 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Degenerative_chain_transfer
is Link from a Wikipage to another Wikipage of	Living free-radical polymerization Reversible addition−fragmentation chain-transfer polymerization
is foaf:primaryTopic of	wikipedia-en:Degenerative_chain_transfer

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