超声辅助PP/云母片介电复合材料的制备与性能
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摘要
通过超声波辅助法将云母片分散在聚丙烯(PP)基体中,然后通过熔融共混法制备不同组分的PP/云母片复合材料。对复合材料的微观形貌和结构进行表征,研究了PP/云母片复合材料的力学性能、介电性能、击穿强度和储能密度。结果表明,超声波辅助法一定程度上有助于云母片的剥离和分散。当云母片含量为5%时,复合材料的拉伸强度和断裂伸长率达到最大,分别为38.8MPa和30%。此时材料的介电性能也达到最佳,击穿强度为362 MV/m;储能密度为1.46J/cm~3,相比于PP纯样增长了51%。由于云母片和PP的协同效应,复合材料的介电损耗也维持在较低水平,低于0.05。
The mica was dispersed in polypropylene(PP) matrix by ultrasound-assisted method,and then PP/mica composites with different components were prepared by melt blending method. The microstructure and morphology of the composites were characterized. The mechanical properties,dielectric properties,breakdown strength and energy storage density of PP/mica composites were studied. The results show that the ultrasonic assisted method is helpful to the separation and dispersion of mica. When the content of mica nanosheet is 5%,the tensile strength and elongation at break of the composite reach the maximum,which are 38.8 MPa and 30%,respectively. At this time,the dielectric properties of the material also surpass that of counterparts,the breakdown strength is 362 MV/m;and the energy storage density is 1.46 J/cm~3,which is 51% higher than that of pure PP. Due to the synergistic effect of mica sheet and PP,the dielectric loss of the composite is also maintained at a low level,lower than 0.05.
The mica was dispersed in polypropylene(PP) matrix by ultrasound-assisted method,and then PP/mica composites with different components were prepared by melt blending method. The microstructure and morphology of the composites were characterized. The mechanical properties,dielectric properties,breakdown strength and energy storage density of PP/mica composites were studied. The results show that the ultrasonic assisted method is helpful to the separation and dispersion of mica. When the content of mica nanosheet is 5%,the tensile strength and elongation at break of the composite reach the maximum,which are 38.8 MPa and 30%,respectively. At this time,the dielectric properties of the material also surpass that of counterparts,the breakdown strength is 362 MV/m;and the energy storage density is 1.46 J/cm~3,which is 51% higher than that of pure PP. Due to the synergistic effect of mica sheet and PP,the dielectric loss of the composite is also maintained at a low level,lower than 0.05.
引文
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[3]Pillai P K C,Narula G K,Tripathi A K.Dielectric properties of polypropylene/polycarbonate polyblends[J].Polymer Journal,1984,16(7):575-578.
[4]Xu P,Gui H,Hu Y,et al.Dielectric properties of polypropylenebased nanocomposites with ionic liquid-functionalized multiwalled carbon nanotubes[J].Journal of Electronic Materials,2014,43(7):2 754-2 758.
[5]Wang D,Zhang X,Zha J,et al.Dielectric properties of reduced graphene oxide/polypropylene composites with ultralow percolation threshold[J].Polymer,2013,54(7):1 916-1 922.
[6]Grari O,Dhouibi L,Lallemand F,et al.Effects of high frequency ultrasound irradiation on incorporation of SiO2 particles within polypyrrole films[J].Ultrasonics Sonochemistry,2015,22:220-226.
[7]Hamzah M S,Mariatti M,Kamarol M.Breakdown characteristics of grafted polypropylene in PP/EPDM hybrid nanocomposite for electrical insulator applications[J].Polymer Bulletin,2018,75:2 529-2 542.
[8]Dang Y,Wang Y,Deng Y,et al.Enhanced dielectric properties of polypropylene based composite using Bi2S3 nanorod filler[J].Progress in Natural Science Materials International,2011,21(3):216-220.
[9]Senden T J,Ducker W A.Surface roughness of plasma-treated mica[J].Langmuir,1992,8(2):733-735.
[10]Low C G,Zhang Q,Hao Y,et al.Graphene field effect transistors with mica as gate dielectric layers[J].Small,2014,10(20):4 213-4 218.
[11]Naderi S H,Shoja R R,Loghman E M R,et al.The effects of organoclay on the morphology and mechanical properties of PAI/clay nanocomposites coatings prepared by the ultrasonication assisted process[J].Ultrasonics Sonochemistry,2017,38:306-316.
[12]董孔祥,卢迪芬,江涛.人工合成云母粉剥离细化的新方法[J].中国粉体技术,2012,18(2):72-75.Dong Kongxiang,Lu Difen,Jiang Tao.A new method for comminuting synthetic mica[J].China Powder Science and Technology,2012,18(2):72-75.
[13]熊传溪,闻荻江.LMPM/PP复合材料中PP的晶型结构[J].中国塑料,1999,13(4):23-28.Xiong Chuanxi,Wen Dijiang.Crystal structure of polypropylene in LMPM/PP composite[J].China Plastics,1999,13(4):23-28.
[14]陶友季,张晓东,麦堪成,等.不同晶型聚丙烯的光老化行为[J].合成树脂及塑料,2010,27(4):70-73.Tao Youji,Zhang Xiaodong,Mai Kancheng,et al.Photodegradation behavior of polypropylene with different crystalline modifications[J].China Synthetic Resin and Plastics,2010,27(4):70-73.
[15]Dang Z M,Yuan J K,Yao S H,et al.Flexible nanodielectric materials with high permittivity for power energy storage[J].Cheminform,2013,25(44):6 334-6 365.
[16]Zhang Z,Gu Y,Bi J,et al.Tunable BT@SiO2 core@shell filler reinforced polymer composite with high breakdown strength and release energy density[J].Composites Part A:Applied Science and Manufacturing,2016,85:172-180.