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Studies on the photo‐oxidation of PP and PP/mLLDPE blend systems: Thermal, physicochemical, and mechanical behavior
Author(s) -
Gupta A. P.,
Saroop U. K.,
Gupta Vidya
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26762
Subject(s) - crystallinity , ultimate tensile strength , materials science , differential scanning calorimetry , polypropylene , linear low density polyethylene , polymer chemistry , thermal stability , composite material , polyethylene , chemical engineering , physics , engineering , thermodynamics
The photo‐oxidative degradation of the blends of polypropylene (PP) with metallocene linear low density polyethylene (mLLDPE) were studied. The blend samples were exposed to the ultraviolet radiation (UV) for a period of 6 weeks. Tensile mechanical characteristics were derived from stress–strain curves. The changes in crystallinity during exposure were followed by X‐ray diffraction (XRD) and differential scanning calorimetry (DSC), whereas the chemical degradation of the blend samples was evaluated by FTIR‐ATR. In case of PP, tremendous decrease is observed in tensile strength, elongation at break, and increase is observed in tensile modulus with exposure time. However, with the addition of mLLDPE, UV stability of PP has significantly improved. A significant increase in crystallinity during UV exposure was noted for PP, whereas for PP/mLLDPE (80/20) blend system the crystallinity did not change much. Therefore low level of stabilizers may be required for PP/mLLDPE blend systems. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007