%0 Journal Article
%T Rheological and Thermal Behavior of High-Density Polyethylene (HDPE) at Different Temperatures
%A Cynthia DˇŻAvila Carvalho Erbetta
%A Get¨˛lio F. Manoel
%A Ana Paula Lelis Rodrigues Oliveira
%A Maria Elisa Scarpelli Ribeiro e Silva
%A Roberto Fernando Souza Freitas
%A Ricardo Geraldo Sousa
%J Materials Sciences and Applications
%P 923-931
%@ 2153-1188
%D 2014
%I Scientific Research Publishing
%R 10.4236/msa.2014.513094
%X In the present work, rheological properties of HDPE samples were measured at temperatures of 150ˇăC, 190ˇăC and 230ˇăC. It was shown, by oscillatory tests, at low frequencies, that, for temperatures of 150ˇăC and 190ˇăC, there was a predominance of the viscous behavior over the elastic one. At 230ˇăC, there was a predominance of the elastic contribution, and there was an increase of the molar mass compared with the ones obtained from the tests at 150ˇăC and 190ˇăC. The results obtained from the temperature ramp oscillatory test showed that, up to around 248ˇăC, the viscous behavior prevailed, the opposite being observed at higher temperatures. At 230ˇăC the sample showed significantly lower values of strain when compared with the ones observed at 150ˇăC and 190ˇăC. Oxidative induction time (OIT), melting point and degree of crystallinity were determined by differential scanning calorimetry (DSC). The DSC results and the rheological measurements showed a completely different behavior for the HDPE samples at 230ˇăC compared with the 150ˇăC and the 190ˇăC ones, suggesting that HDPE, at the temperature of 230ˇăC, underwent thermo-oxidative degradation with the initial predominance of crosslinking.
%K HDPE
%K Rheology
%K Degradation
%K DSC
%K FTIR
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51823