抗冲共聚聚丙烯的结构与性能
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摘要
研究了5种熔体流动速率为28 g/10 min,乙烯质量分数为10%左右的车用抗冲共聚聚丙烯(IPC)的力学性能、相态结构、熔融结晶行为、橡胶相尺寸及分布、加工性能。结果表明:IPC-4整体力学性能最优,拉伸强度为24.60 MPa,弯曲模量为1 401.71 MPa,冲击强度为10.02 kJ/m~2;IPC是由无规共聚物、嵌段共聚物和均聚聚丙烯三部分组成;IPC-4具有最高的熔融焓和结晶焓,即材料有高的结晶度和刚性;IPC-4的孔洞分布更均匀、孔洞直径相差不大,平均值为1μm;5种试样的加工性能较为接近,最适宜的注塑温度为200℃。
Five impact copolymerized polypropylene(IPC) products with the melt flow rate of 28 g/10 min and the mass fraction of ethylene content of 10% were compared in terms of mechanical properties,phase structure,melting and crystallization,size and distribution of rubber phase,and processability. The results show that the overall mechanical properties of the sample IPC-4 are the best,whose tensile strength is 24.60 MPa,flexural modulus is 1401.71 MPa,and impact strength is 10.02 kJ/m~2. IPC consists of three parts:random copolymer,block copolymer and homo-polymer. IPC-4 has the highest melting enthalpy and crystallization enthalpy,representing high crystallinity and rigidity. The distribution of pores in IPC-4 is more uniform with the average pore diameter of 1 μm. The processing performance of these five samples is relatively close,and the optimum injection temperature is 200 ℃.
Five impact copolymerized polypropylene(IPC) products with the melt flow rate of 28 g/10 min and the mass fraction of ethylene content of 10% were compared in terms of mechanical properties,phase structure,melting and crystallization,size and distribution of rubber phase,and processability. The results show that the overall mechanical properties of the sample IPC-4 are the best,whose tensile strength is 24.60 MPa,flexural modulus is 1401.71 MPa,and impact strength is 10.02 kJ/m~2. IPC consists of three parts:random copolymer,block copolymer and homo-polymer. IPC-4 has the highest melting enthalpy and crystallization enthalpy,representing high crystallinity and rigidity. The distribution of pores in IPC-4 is more uniform with the average pore diameter of 1 μm. The processing performance of these five samples is relatively close,and the optimum injection temperature is 200 ℃.
引文
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[15]焦旗,田广华,杨坚,等.抗冲共聚聚丙烯2500H熔体流变行为研究[J].工程塑料应用,2015,43(6):81-85.
[2]张鹏,李广全,刘敏,等.抗冲共聚聚丙烯EP548N的结构与性能[J].石化技术与应用,2015,33(1):38-41.
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[4]Cai Hongjun,Luo Xiaolie,Ma Dezhu,et al. Structure and proper-ties of impact copolymer polypropylene.I. Chain structure[J]. JAppl Polym Sci,1999,71(1):93-101.
[5]罗华林,赵莹,吴瑾光,等.抗冲共聚聚丙烯中二甲苯可溶物的链结构与性能研究[J].光谱学与光谱分析,2012,32(12):3363-3366.
[6]Zhang Chunhui,Shangguan Yonggang,Chen Ruifen,et al.Morphology,microstructure and compatibility of impact poly-propylene copolymer[J]. Polymer,2010,51(21):4969-4977.
[7]Pustak A,?vab I,Govor?in Bajsi?E,et al. Polypropylene blendswith M-EPR copolymers:structure,morphology and thermalproperties[J]. Polym-Plast Technol Eng,2018,57(3):229-241.
[8]马良兴,袁春海,袁秀芳,等.乙丙抗冲共聚聚丙烯结构的研究[J].石油化工,2007,36(11):1123-1127.
[9]刘小燕,陈旭,冯颜博,等.抗冲共聚聚丙烯的组成、结构与性能[J].石油化工,2013,42(1):30-33.
[10]施红伟,刘宣伯,郭梅芳,等.抗冲共聚聚丙烯的组成及其结晶行为[J].合成树脂及塑料,2017,34(1):77-80.
[11]孙颜文,王小涓,赵红竹,等.汽车用高流动性共聚聚丙烯的结构与性能[J].合成树脂及塑料,2005,22(5):40-45.
[12]Ferreira C I,Dal Castel C,Oviedo M A S,et al. Isothermaland non-isothermal crystallization kinetics of polypropylene/exfoliated graphite nanocomposites[J]. Thermochimica Acta,2013,553:40-48.
[13]莫志深.一种研究聚合物非等温结晶动力学的方法[J].高分子学报,2008(7):656-661.
[14]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):584-588.
[15]焦旗,田广华,杨坚,等.抗冲共聚聚丙烯2500H熔体流变行为研究[J].工程塑料应用,2015,43(6):81-85.