Abstract
The effect of stereoregularity on the thermo-oxidative degradation of polypropylenes, isotactic (IPP) and syndiotactic (SPP), was examined by means of chemiluminescence (CL), infrared spectroscopy and molecular weight measurement and their thermal stability was compared with that of high density polyethylene (HDPE). SPP was extremely stable to the thermal oxidation and CL signals appeared much later than in IPP and even later than in HDPE. For example, at 130°C SPP showed no CL signals at all even after 7600 min, while IPP showed a maximum peak after 100 min and HDPE first peak after 460 min. At 140°C, CL signals from SPP appeared at last after 2835 min, and after 45 min from IPP and 240 min from HDPE. Changes in infrared (IR) spectra and molecular weights of the oxidized samples coincided with the results obtained from CL measurement. From the results obtained it was concluded that the stereoregularity of polypropylenes definitely affects their thermal oxidation and SPP is much more stable than IPP.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
