Relations Between Chain Architecture,Surface Roughening and Physical Properties in Polypropylene Capacitor Films
In order to elucidate the effect of chain structure characteristics on the surface roughening and bulk properties of biaxially oriented polypropylene films(BOPP).The crystallization behavior and homogeneous polycrystallinity of three polypropylene(PP)granules with different chain structures were compared.The porosity,roughness,tensile mechanics,thermal shrinkage,dielectric properties and electrical breakdown field strength of BOPP films at different temperatures were tested.The results show that the chain structure with low tacticity(96.2%)and wide molecular weight distribution(5.35)is conducive to the formation of β crystals and uniform spherulite morphology,ensuring the ideal roughening morphology.Although the roughening form of BOPP film prepared by high-tacticity(97.4%)and narrow-distribut(4.34)granules is not optimal,the porosity is 9%and the surface roughness is 0.42 μm,which can meet the requirements of the capacitive film industry standard.Compared with the control films,the transverse tensile strength is 269 MPa,the transverse elastic modulus is 3 692 MPa,and the breakdown field strengths are 668 V/m(25℃)and 518 V/m(125℃).Appropriate adjustment of the PP chain structure can take into account the surface roughening and bulk performance,and provide useful inspiration for the design and development of high-performance roughening film for oil-immersed AC capacitors.
Surface-roughened film for capacitorPolymorphismTacticityMolecular weight distribution
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