Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
The general link between random scissions in linear polymers, changes in average chain length and the Mark-Houwink equation
KTH, Skolan för kemivetenskap (CHE), Kemi, Kärnkemi.
2005 (Engelska)Ingår i: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 88, nr 2, s. 159-167Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Theories for random scission degradation of polymers are motivated from the basic scientific interest in reaction kinetics and yields of process. There is a tradition to derive scission-measures (bond consumption or cleavage) from the number average of chain length in a molecular weight distribution. It is understood by many that the validity of these derivations will be conditional and many attempts are made to extend the accuracy of the models. This article presents a mass-based derivation for changes in chain length that offers scission-values not only from number averages but also from the mass and viscosity averages, independent of molecular weight distribution profile. The derivation shows the interdependence between the Mark-Houwink equation and scission calculus. The exponent in the Mark-Houwink equation is proposed to originate from the process of varying polymer chain lengths for calibration and the initial content of polymer chain ends in the sample as well as the earlier proposed effects from chain curl. Calculation of the number of random scission hence demands the Mark-Houwink parameters to be calibrated by varying polymer chain lengths using random scission generation.

Ort, förlag, år, upplaga, sidor
2005. Vol. 88, nr 2, s. 159-167
Nyckelord [en]
polymer degradation, radiolytic degradation, cellulose, number average, mass average, viscosity average, scissions, bond consumption, paper permanence, degradation, cellulose, prediction
Identifikatorer
URN: urn:nbn:se:kth:diva-14634DOI: 10.1016/j.polymdegradstab.2003.09.022ISI: 000227915900001Scopus ID: 2-s2.0-14544289902OAI: oai:DiVA.org:kth-14634DiVA, id: diva2:332675
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Sök vidare i DiVA

Av författaren/redaktören
Lind, Johan
Av organisationen
Kärnkemi
I samma tidskrift
Polymer degradation and stability

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 204 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf