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Cracking formation on the surface of extruded photodegraded polypropylene plates
Author(s) -
Fechine G.J.M.,
Demarquette N.R.
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20958
Subject(s) - polypropylene , materials science , photodegradation , differential scanning calorimetry , composite material , extrusion , fourier transform infrared spectroscopy , cracking , crazing , analytical chemistry (journal) , optics , polymer , chemistry , chromatography , biochemistry , physics , photocatalysis , thermodynamics , catalysis
The cracking formation during the photodegradation of polypropylene (PP) plates (1 mm thickness), with (PPOx) and without pro‐oxidant (PP), has been investigated. The plates were produced by extrusion in an industrial production line and were exposed to ultraviolet radiation in the laboratory for periods of up to 480 hr. The samples were investigated by infrared spectroscopy—FTIR, optical light microscopy, differential scanning calorimetry (DSC) and X‐ray diffraction (XRD). The results showed that the extension of photodegradation process is more intense for PPOx than for PP samples. For both samples, cracks were formed at the surface perpendicularly to the flow‐lines. However the cracks frequency was different for both samples and sides of sample. The crack frequency was correlated with chain orientation, A 110 ; it was shown that lower degrees of orientation resulted in lower crack frequency. POLYM. ENG. SCI., 2008. © 2007 Society of Plastics Engineers