石墨形态对聚丙烯性能的影响研究
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摘要
利用不同形态的石墨通过熔融共混的方法来对PP进行改性,实验发现石墨形态对PP的力学性能、结晶行为等有着不同的影响。粉状石墨有利于提高PP的熔融指数和断裂伸长率,最佳填充质量分数为1%;片状石墨有利于提高PP的拉伸强度、结晶速度和结晶度,最佳填充质量分数为3%;在增韧PP方面,粉状石墨和片状石墨具有相同的效果,PP的冲击强度随石墨填充比例的增加而逐渐提高。
Polypropylene is modified by different forms of graphite through melt blending. It is found that different graphite form has different effect on the mechanical properties and crystallization behavior of polypropylene. Powder graphite can improve the melting index and elongation at break of polypropylene, and the optimum filling ratio is 1%; flake graphite can improve the tensile strength, crystallization rate and crystallinity of polypropylene, and the optimum filling ratio is 3%. In terms of toughening polypropylene, powder graphite and flake graphite have the same effect. The impact strength of polypropylene increases with the increase of graphite filling ratio.
Polypropylene is modified by different forms of graphite through melt blending. It is found that different graphite form has different effect on the mechanical properties and crystallization behavior of polypropylene. Powder graphite can improve the melting index and elongation at break of polypropylene, and the optimum filling ratio is 1%; flake graphite can improve the tensile strength, crystallization rate and crystallinity of polypropylene, and the optimum filling ratio is 3%. In terms of toughening polypropylene, powder graphite and flake graphite have the same effect. The impact strength of polypropylene increases with the increase of graphite filling ratio.
引文
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[3] BAI H,WANG Y,SONG B,et al.Synergistic Toughening Effects of Nucleating Agent and Ethylene-octene Copolymer on Polypropylene[J].Journal of Applied Polymer Science,2010(5):3270-3280.
[4] 江梅,王清国,聂华.汽车塑料及其制品的发展[J].汽车工艺与材料,2005(4):37-39.
[5] 张永霞,谢昕,王庆涛,等.聚丙烯共混增韧改性研究进展[J].合成材料老化与应用,2018(1):85-90,136.
[6] 尹朝清,刘乐文,张爽爽.刚性粒子/POE对聚丙烯的协同增韧机制[J].塑料,2019(1):53-57.
[7] SHEN J W,CHEN X M,HUANG W Y.Structure and Electrical Properties of Grafted Polypropylene/graphite Nanocomposites Prepared by Solution Intercalation[J].Journal of Applied Polymer Science,2003(7):1864-1869.
[8] CREUSA I F,OTAVIO B,MAURO A S O,et al.Morphological,Viscoelastic and Mechanical Characterization of Polypropylene/Exfoliated Graphite Nanocomposites[J].Polimeros-ciencia E Tecnologia,2013(4):456-461.
[9] AKINCI A.Mechanical and Structural Properties of Polypropylene Composites Filled With Graphite Flakes[J].Archives of Materials Science & Engineering,2009(2):91-94.
[10] HERRERA R,LUIS C,CASTELL P,et al.How do Graphite Nanoplates Affect the Fracture Toughness of Polypropylene Composites[J].Composites Science & Technology,2015,111:9-16.
[11] TENG C C,MA C C M,HUANG Y W,et al.Effect of MWCNT Content on Rheological and Dynamic Mechanical Properties of Multiwalled Carbon Nanotube/polypropylene Composites[J].Composites Part A,2008(12):1869-1875.
[12] LIN Z,HUANG Z,ZHANG Y,et al.Crystallization and Melting Behavior of Nano-CaCO3 /polypropylene Composites Modified by Acrylic Acid[J].Journal of Applied Polymer Science,2010(4):2443-2453.
[13] LI Y,ZHU J,WEI S,et al.Poly(propylene)/Graphene Nanoplatelet Nanocomposites:Melt Rheological Behavior and Thermal,Electrical,and Electronic Properties[J].Macromolecular Chemistry & Physics,2011(18):1951-1959.
[14] KALAITZIDOU K,FUKUSHIMA H,ASKELAND P,et al.The Nucleating Effect of Exfoliated Graphite Nanoplatelets and Their Influence on the Crystal Structure and Electrical Conductivity of Polypropylene Nanocomposites[J].Journal of Materials Science,2008(8):2895-2907.
[15] WAKABAYASHI K,BRUNNER P J,JUNICHI M,et al.Polypropylene-graphite Nanocomposites Made by Solid-state Shear Pulverization:Effects of Significantly Exfoliated,Unmodified Graphite Content on Physical,Mechanical and Electrical Properties[J].Polymer,2010(23):5525-5531.
[16] 莫志深,张宏放,张吉东.晶态聚合物结构和X射线衍射[M].2版.北京:科学出版社,2010.
[17] 冯嘉春,陈鸣才,黄志镗.硬脂酸镧复合物对聚丙烯β晶型的诱导作用[J].高等学校化学学报,2001(1):154-156.