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
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
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.
1 Tang W H, Tang J, Yuan H L, et al. Crystallization behavior and mechanical properties of polypropylene random copolymer/poly(ethy-lene-octene) blends[J]. J Appl Polym Sci,2011,122(1):461. 2 Leng J H, Lui H, He B B, et al. Combined effect of modified zeolite 13X and β-nucleating agent on improving β-crystal content and toughening polypropylene random copolymer[J]. Chin J Polym Sci,2013,31(11):1563. 3 Chen J W, Dai J, Yang J H, et al. Annealing-induced crystalline structure and mechanical property changes of polypropylene random copolymer[J]. J Mater Res,2013,28(22):3100. 4 Wu H Y, Li X X, Wang Y H, et al. Fracture behaviors of isotactic polypropylene/poly(ethylene oxide) blends: Effect of annealing[J]. Mater Sci Eng A,2011,528(27):8013. 5 Bai H W, Luo F, Zhou T N, et al. New insight on the annealing induced microstructural changes and their roles in the toughening of β-form polypropylene[J]. Polymer,2011,52(10):2351. 6 Liu B B, Shangguan Y G, Zheng Q. Toughening of ethylene-propy-lene random copolymer/clay nanocomposites: Comparison of diffe-rent compatibilizers[J]. Chin J Polym Sci,2012,30(6):853. 7 Li J X, Cheung W L, Jia D M. A study on the heat of fusion of β-polypropylene[J]. Polymer,1999,40(5):1219. 8 Turner Jones A, Aizlewood Jean M, Beckett D R. Crystalline forms of isotactic polypropylene[J]. Macromolecular Chem Phys,1964,75(1):134. 9 Xu W B, Ge M L, He P S. Non-isothermal crystallization kinetics of polypropylene/montmorillonite nanocomposite[J]. Acta Polym Sin,2001(5):584(in Chinese). 徐卫兵,戈明亮,何平笙.聚丙烯/蒙脱土纳米复合材料非等温结晶动力学的研究[J]. 高分子学报,2001(5):584. 10 Bai H W, Wang Y, Zhang Z J, et al. Influence of annealing on microstructure and mechanical properties of isotactic polypropylene with β-phase nucleating agent[J]. Macromolecules,2009,42(17):6647. 11 Cao J, Lv Q F. Effect of annealing on the crystallization properties of β-PPR and high MFR β-PPR[J]. Polym Mater Sci Eng,2012,28(6):32 (in Chinese). 曹静,吕秋丰.热处理对 β-PPR和高熔体流动速率 β-PPR结晶性能的影响[J]. 高分子材料科学与工程,2012,28(6):32. 12 Wu T, Xiang M, Cao Y, et al. Influence of annealing on stress-strain behaviors and performances of β nucleated polypropylene stretched membranes[J]. J Polym Res,2014,21(11):598. 13 Offord G T, Armstrong S R, Freeman B D, et al. Porosity enhancement in β nucleated isotactic polypropylene stretched films by thermal annealing[J]. Polymer,2013,54(10):2577.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
