ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The natural photo-oxidation of PP bars containing nucleating agent (TMB-5) were studiedby using infrared microscope (IM), differential scanning calorimetry (DSC), scanning electronmicroscope (SEM) and polarizing optical microscope (POM). The results indicated that nucleatingagent accelerated the oxidation of PP significantly. The oxidation began from the surface anddeveloped into the interior with time. There is a transition region near the surface, caused by the fastcooling during the injection moulding. This region is prior to be oxidized because of the low density.Therefore, it corresponded to the surface oxidation layer in PP and PP/TMB-5 bars. The nucleatingagent helped to reduce the spherulite size of PP and broaden the transition region greatly – from about25 μm to more than 200μm, covering the morphology of amorphous, fine crystals to relatively perfectcrystals. More crystal boundaries, i.e. low density, and broad transition region led to higher oxidationdegree and further oxidation along the depth. However, the thickness of the surface oxidation layermaintained nearly constant till the fragments dropped from the seriously damaged surface
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1075.pdf
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