Effects of Annealing Process on Crystallization and Low Temperature Resistance Properties of PP-R Composites

  • Yulong Ma (麻玉龙)
  • Xiaomeng Wang
  • Wei Liu
  • Wei Gong (龚维)Email author
  • Li He (何力)Email author
Advanced Materials


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.

Key words

polypropylene crystallization annealing process low temperature toughness 


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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Materials and Architectural EngineeringGuizhou Normal UniversityGuiyangChina
  2. 2.National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyangChina
  3. 3.Guizhou Institute of Metallurgy and Chemical EngineeringGuiyangChina

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