Abstract
The effects of the annealing process on the mechanical properties and crystallization behaviors of polypropylene random copolymer (PP-R) composites were investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM). The experimental results indicated that the annealing process significantly influenced the comprehensive properties of PP-R composites. At temperatures below 23 °C, the impact strength of the PP-R composites annealed at 120 °C for 6 h was relatively high at 74.73 kJ/m2, which was 16.8% higher than that of the samples annealed at 80 °C for 6 h. At low temperatures (-30-0 °C), the impact strength ranged from approximately 13.31 kJ/m2 to 54.4 kJ/m2. In addition, the annealing process conducted at 120 °C for 6 h improved the crystalline structure and low-temperature toughness of the PP-R composites and induced α-form to β-form crystal transformation. The work provides a possible method to reinforce and toughen the semicrystalline polymer at low temperatures (-30-0 °C) by annealing.
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Funded by the Science and Technology Cooperation Program of Guizhou Province of China([2016]5673), and the Excellent Youth and Science & Technology Talent Foundation of Guizhou Province of China ([2015]29)
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Ma, Y., Wang, X., Liu, W. et al. Effects of Annealing Process on Crystallization and Low Temperature Resistance Properties of PP-R Composites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 855–862 (2018). https://doi.org/10.1007/s11595-018-1904-y
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DOI: https://doi.org/10.1007/s11595-018-1904-y