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Effect of Annealing on Crystalline Structure and Low-temperature Toughness of
Polypropylene Random Copolymer Dedicated Pipe Materials |
| WANG Xiaomeng1,2, YIN Xiaogang1,2, JIANG Tuanhui2, LIU Wei1, GONG Wei1,2
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1 College of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025;
2 National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang 550014 |
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Abstract The effect of annealing on mechanical properties and crystallization behaviors of polypropylene random copolymer (PPR) dedicated pipe materials were analyzed by SEM, differential scanning calorimetry (DSC), XRD and polarized optical microscopy (POM). The results showed that when compared with unannealed sample, PPR annealed at 120 ℃ for 6 h indicated desired impact toughness and the relative better comprehensive mechanical properties under room temperature and low temperature (0-23 ℃). The impact strength at 23 ℃ was 51.61 kJ/m2 which was 1.9 times than that of unannealed sample. And the impact strength at 0 ℃ was also up to 33.86 kJ/m2 which was 2.9 times than that of unannealed PPR.
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Published: 25 February 2017
Online: 2018-05-02
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2017, Vol. 31 
