PropertyValue
dbpedia-owl:abstract
  • La plupart des polymères organiques (et des matériaux correspondants) sont, de par leur structure caténaire, considérés comme des composés « vivants », car sensibles à leur environnement et sujets au vieillissement. La dégradation d'un polymère est le changement, généralement non désiré, de ses propriétés physiques et mécaniques, causé par des facteurs environnementaux plus ou moins agressifs : attaque d'un produit chimique tel un acide concentré, dioxygène (oxydation), chaleur, radiation (photolyse), eau (hydrolyse), contrainte, etc. Ensemble, ces facteurs agissent souvent en synergie. La dégradation peut rendre le matériau inutilisable.
  • Polymer degradation is a change in the properties—tensile strength, color, shape, etc.—of a polymer or polymer-based product under the influence of one or more environmental factors such as heat, light or chemicals such as acids, alkalis and some salts. These changes are usually undesirable, such as cracking and chemical disintegration of products or, more rarely, desirable, as in biodegradation, or deliberately lowering the molecular weight of a polymer for recycling. The changes in properties are often termed "aging". In a finished product such a change is to be prevented or delayed. Degradation can be useful for recycling/reusing the polymer waste to prevent or reduce environmental pollution. Degradation can also be induced deliberately to assist structure determination.Polymeric molecules are very large (on the molecular scale), and their unique and useful properties are mainly a result of their size. Any loss in chain length lowers tensile strength and is a primary cause of premature cracking.
dbpedia-owl:thumbnail
dbpedia-owl:wikiPageID
  • 7448477 (xsd:integer)
dbpedia-owl:wikiPageLength
  • 13568 (xsd:integer)
dbpedia-owl:wikiPageOutDegree
  • 148 (xsd:integer)
dbpedia-owl:wikiPageRevisionID
  • 110497603 (xsd:integer)
dbpedia-owl:wikiPageWikiLink
prop-fr:fr
  • Antidégradant
  • Antiozonant
  • Dégradation thermique d'un polymère
  • Photo-oxydation d'un polymère
  • Stabilisant pour polymère
  • Test climatique d'un polymère
  • agent anti-UV
  • craquelage par l'ozone
  • fissuration sous contrainte environnementale
prop-fr:lang
  • en
prop-fr:texte
  • craquelures
  • anti-UV
  • antidégradants
  • antiozonants
  • dégradation thermique
  • photo-oxydation
  • stabilisants
  • évaluer le vieillissement climatique
prop-fr:trad
  • Anti-degradant
  • Antiozonant
  • Environmental stress cracking
  • Ozone cracking
  • Photo-oxidation of polymers
  • Stabilizer for polymers
  • Thermal degradation of polymers
  • UV stabilizers in plastics
  • Weather testing of polymers
prop-fr:wikiPageUsesTemplate
dcterms:subject
rdfs:comment
  • La plupart des polymères organiques (et des matériaux correspondants) sont, de par leur structure caténaire, considérés comme des composés « vivants », car sensibles à leur environnement et sujets au vieillissement.
  • Polymer degradation is a change in the properties—tensile strength, color, shape, etc.—of a polymer or polymer-based product under the influence of one or more environmental factors such as heat, light or chemicals such as acids, alkalis and some salts. These changes are usually undesirable, such as cracking and chemical disintegration of products or, more rarely, desirable, as in biodegradation, or deliberately lowering the molecular weight of a polymer for recycling.
rdfs:label
  • Dégradation d'un polymère
  • Polymer degradation
  • Деструкция полимеров
owl:sameAs
http://www.w3.org/ns/prov#wasDerivedFrom
foaf:depiction
foaf:isPrimaryTopicOf
is dbpedia-owl:wikiPageDisambiguates of
is dbpedia-owl:wikiPageRedirects of
is dbpedia-owl:wikiPageWikiLink of
is foaf:primaryTopic of