Author(s): Mamatjan Yimit, Amatjan Sawut, Chunyun Guo, Linggui Ni, Key Laboratory of Oil and Gas Fine Chemicals, Ministry of Education and Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Xinjiang Turpan Natural Environmental Test Research Center
Pages: 81-85
Year: 2016 Issue:  11
Journal: Polymer Materials Science & Engineering
Keyword:  polypropylene; natural ageing test; molecular weight; elongation at break;
Abstract: Turpan was chosen as outdoor exposure field for natural ageing test of PP and weather-resistance PP,continuous exposure for 12 months. The elongation at break and impact strength,surface microscopic morphology and elemental composition,molecular weight and molecular weight distribution of samples were studied in process of outdoor exposure. The results show that elongation at break and impact strength retention rate of sample PP-0 after 90 d exposure fall to 6. 4% and 5. 6%,respectively,an increase of 23. 21% for oxygen content,the average molecular weight of sample is reduced from 242000 to 80700,a large number of surface cracks with the width of 3. 05 μm. While the anti-aging aids of weathering modified PP-3 samples can play a synergistic effect,inhibiting degradation rate of PP,thereby increasing life of polypropylene.