TY - JOUR ID - 1340 TI - Comparative study of degradation of PP modified with organic pro-degradant subjected to natural and artificial ageing JO - Polyolefins Journal JA - POJ LA - en SN - 2322-2212 AU - Montagna, Larissa Stieven AU - Pezzin, Ana Paula Testa AU - Forte, Maria Madalena AU - Santana, Ruth Marlene AD - UFRGS (Laboratory of Polymeric Materials, Department of Materials Engineering, Federal University of Rio Grande do Sul, 91540-000, Porto Alegre, Rio Grande do Sul, Brazil) AD - UNIVILLE (Engineering of Process Program, University of Joinville Region, Campus Universitário, s/n, Bairro, Bom Retiro, 89.201-972, Joinville, Santa Catarina, Brazil) Y1 - 2016 PY - 2016 VL - 3 IS - 2 SP - 93 EP - 101 KW - Polypropylene KW - degradation KW - organic pro-degradant, ultra-violet radiation DO - 10.22063/poj.1999.1340 N2 - In abiotic degradation the action of light radiation is one of the most important parameters, because polymers undergo degradation due to the action of light (natural or artificial). The aim of this study was to investigate the degradation rate for samples of polypropylene (PP) modified with an organic pro-degradant submitted to ageing in a natural environment and to accelerated ageing test. The degradation behavior of the samples exposed to the ageing processes was evaluated through changes in the degree of crystallinity (Xc ), surface morphology (Scanning Electron Microscopy) and molecular weight. The results indicated that for the modified polypropylene samples natural ageing led to a 42.3% reduction in the molecular weight and the surface morphology showed evidence of erosion. In the accelerated ageing process the UV radiation was stronger, which led to a 94.3% increase in the degree of crystallinity and micro-voids were present on the surface of the modified polypropylene. UR - http://poj.ippi.ac.ir/article_1340.html L1 - http://poj.ippi.ac.ir/article_1340_31ac48e10351e3e29cd946c50b2b5915.pdf ER -