溶液共混法制备碱式硫酸镁晶须/聚丙烯复合材料及其力学性能
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摘要
以二甲苯作为溶剂、聚丙烯(PP)作为基体、月桂改性的碱式硫酸镁晶须(MOSw)作为填料,采用溶液共混法制备了一系列碱式硫酸镁晶须/聚丙烯(PP/MOSw)复合材料。力学性能测试结果表明:当MOSw添加量小于5%(质量分数,下同)时,复合材料的拉伸强度、屈服强度及冲击强度均有明显提升。随着MOSw添加量的进一步增大,PP/MOSw复合材料的拉伸强度和屈服强度反而下降,但仍然优于相同添加量的熔融共混法样品。断面扫描电镜(SEM)结果表明:当MOSw添加量小于5%时,其分散较为均匀;当MOSw添加量较大时,其在基体中易发生团聚,且团聚体与基体之间的相容性差。此外,还采用Turcsányi方程定量计算了填料与基体之间的界面相互作用,结果同样表明:当MOSw添加量小于5%时,晶须与基体之间的界面相互作用较强;随着MOSw添加量的增大,晶须与基体之间的界面相互作用减弱。
A series of polypropylene/magnesium oxysulfate whisker(PP/MOSw) composites were prepared via solution blending method, using xylene as solvent, PP resin as matrix and lauric acid modified MOSw as filler. Mechanical property tests showed that the tensile strength, yield strength and impact strength were all greatly increased when the amount of MOSw was less than 5 wt%. With the further increase of MOSw content, the tensile strength and yield strength of PP/MOSw composites turned to decline, but still greater than those of composites prepared via melt blending method. The SEM analyses of fracture surface implied that less than 5 wt% amount of MOSw was well-dispersed. However, great amount of MOSw easily led to aggregating and had poor compatibility with PP matrix. Besides, Turcsányi equation was used to quantitative calculate the interfacial interaction between MOSw and PP matrix. The results also confirmed that less than 5 wt% amount of MOSw led to stronger interfacial interaction. With the increase of MOSw content, the interfacial interaction instead became weaker.
A series of polypropylene/magnesium oxysulfate whisker(PP/MOSw) composites were prepared via solution blending method, using xylene as solvent, PP resin as matrix and lauric acid modified MOSw as filler. Mechanical property tests showed that the tensile strength, yield strength and impact strength were all greatly increased when the amount of MOSw was less than 5 wt%. With the further increase of MOSw content, the tensile strength and yield strength of PP/MOSw composites turned to decline, but still greater than those of composites prepared via melt blending method. The SEM analyses of fracture surface implied that less than 5 wt% amount of MOSw was well-dispersed. However, great amount of MOSw easily led to aggregating and had poor compatibility with PP matrix. Besides, Turcsányi equation was used to quantitative calculate the interfacial interaction between MOSw and PP matrix. The results also confirmed that less than 5 wt% amount of MOSw led to stronger interfacial interaction. With the increase of MOSw content, the interfacial interaction instead became weaker.
引文
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6 Kouhei Ueno,Tomohiko Akagawa,Kazuyosbi Obana.U.S.patent,US4997871,1991.
7 Lei W,Lei W G.Fiber Reinforced Plastics/Composites,2006(5),13(in Chinese).雷文,雷文广.玻璃钢/复合材料,2006(5),13.
8 Jiang Y Z,Li Y B.Journal of Shenyang Ligong University,2009,28(1),1(in Chinese).姜玉芝,李彦博.沈阳理工大学学报,2009,28(1),1.
9 Dang L.Surface modification of magnesium oxysulfate whisker and its application in polypropylene.Ph.D.Thesis,University of Chinese Academy of Science (Institution of Qinghai Salt Lakes),China,2017(in Chinese).党力.碱式硫酸镁晶须表面改性及其在聚丙烯材料中的应用研究.博士学位论文,中国科学院大学(青海盐湖研究所),2017.
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14 Bagheriasl D,Carreau P J,Dubois C,et al.Composites Science and Technology,2015,117,357.
15 Schwab R,Ruff V.Acta Materialia,2013,61(5),1798.
16 Sieradzki K,Rinaldi A,Friesen C,et al.Acta Materialia,2006,54(17),4533.
17 Shi H W,Tang Y J.China Synthetic Resin and Plastics,2017,34(4),56(in Chinese).施红伟,唐毓婧.合成树脂及塑料,2017,34(4),56.
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20 Ma W Y.Research on preparation and mechanical properties of PP/POE blends and nano-composites.Ph.D.Thesis,South China University of Technology,China,2011(in Chinese).马文勇.PP/POE共混物及其纳米复合材料的制备和力学性能的研究.博士学位论文,华南理工大学,2011.
21 Turcsanyi B,Pukanszky B,Tudos F.Journal of Materials Science Letters,1988,7(2),160.