# Wavelength sensitivity in polypropylene/clay composite photooxidation

> Title: Wavelength sensitivity in polypropylene/clay composite photooxidation Page Range: p.93-102 Author(s): Samira Aslanzadeh; Haghighat Kish M File size: Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer Composites Issue Year: ppc Volume: 23 Issue No: No.2 Abstract The...

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Published: 2015-02-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: Wavelength sensitivity in polypropylene/clay composite photooxidation**
 Page Range: p.93-102
 Author(s): Samira Aslanzadeh; Haghighat Kish M
 File size:
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc23-2&JournalID=102411&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 23
 Issue No: No.2

**Abstract**
 The photo-oxidation behaviour of polypropylene/maleic anhydride-grafted polypropylene/organic modified montmorillonite (PP/PPgMA/OMMT) composites with short wavelength (UVC) and long wavelength (UVA) ultraviolet radiation was examined. The samples were prepared in a co-rotating twin-screw extruder and compatibilisers with different degrees of maleation were used. The photo-oxidative stability was studied using FTIR spectroscopy and microscopy. During UVA exposure, the rate of photo-oxidation of PP/PPgMA/OMMT increased with the amount of maleic anhydride from 0.1 to 0.5 wt.% in PPgMA. However, even after 2500 h of exposure to the radiation, the FTIR spectrum of pristine PP did not show significant changes. For UVC radiation, the rate of photo-oxidation of PP/PPgMA/OMMT composites was the same as that of pristine PP. On the other hand, there was a difference between PP and PP/PPgMA/OMMT composites in the formation of a crack on the back surfaces of the sheets facing the UVC sources. The difference was due to the presence of Fe3+ in clay layers that had the effect of UV-protection and blocking in the UVC region. 54 Refs.

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