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Effect of Thermal Aging on Aggregated State Structure of Polypropylene Cable Insulating Material
ZHANG Kai, LIU Ai-min, DUAN Yu-bing, GAO Yuan, MU Ming-liang, YAN Sen, NIE Xing-cheng, WU Chun-hai
PDF(2196 KB)
PDF(2196 KB)
Effect of Thermal Aging on Aggregated State Structure of Polypropylene Cable Insulating Material
In order to investigate the effect of thermal aging on the aggregation structure of polypropylene, two kinds of polypropylene insulating materials were prepared by melt blending and grafting modifications, and accelerated thermal aging tests were carried out on each specimen. The structures of the aggregated states before and after thermal aging were characterized by X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy. The results show that only α-crystals exist in the blended polypropylene before aging, and thermal aging can induce the production of β-crystals, while the αcrystals and β crystals coexist in the grafted polypropylene before and after aging, but β crystal content decreases significantly after aging. The crystallization rate of the two polypropylene is significantly higher than that of cross-linked polyethyline (XLPE), in which the grafted polypropylene has obvious heterophase nucleation, its crystal is more perfect and the crystal size distribution is uniform, and the crystallinity is as high as 40.17%. At the same time, grafted polypropylene specimens show better resistance to thermal oxygen aging, and the damage degree of grafted polypropylene specimens is significantly lower than that of blended polypropylene specimens.
Polypropylene / Blending modification / Graft modification / Aggregate state structure
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