Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
<< vorige   
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 8 van 8 gevonden artikelen
 
 
  THERMAL DEGRADATION OF POLYPROPYLENE IN A CAPILLARY RHEOMETER
 
 
Titel: THERMAL DEGRADATION OF POLYPROPYLENE IN A CAPILLARY RHEOMETER
Auteur: Huang, Jan-Chan
Xu, Junke
Verschenen in: International journal of polymeric materials
Paginering: Jaargang 52 (2003) nr. 3 pagina's 203-209
Jaar: 2003-03
Inhoud: Melt viscosity of a polypropylene (PP) resin was measured in a capillary rheometer between 220 and 260°C. The melt viscosity showed a power law behavior with strong shear rate dependence. The effects of temperature and shear rate on the degradation were studied in the rheometer by heating at 260 and 280°C, and extruding at shear rates up to 10000 sec -1 . Melt flow index (MFI) of samples after shearing and heating treatment was measured to characterize the molecular weight change. An increase in MFI was found for PP sheared at high temperature. Heating for longer time also increased MFI. Increase of shear rate had a small effect on increasing MFI at 260°C but produced a larger effect at 280°C. A constant increment in MFI was observed in PP subjected to high temperature processing and was attributed to degradation due to oxygenated products.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 8 van 8 gevonden artikelen
 
<< vorige   
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland