高频交变电场下聚三氟氯乙烯介电性能研究

Dielectric properties of polytrifluorochloroethylene under high frequency alternating electric field

用差示扫描量热法(differential scanning calorimetry,DSC),在高频交变电场下,研究纯聚三氟氯乙烯在176、186℃热处理、共聚改性、聚三氟氯乙烯+钛酸钡模式下的介电性能。结果表明:高频交变电场中,186℃热处理后的聚三氟氯乙烯具有较佳的介电性能;用极性低的单体改性聚三氟氯乙烯能使其介电损耗减小;随钛酸钡含量增加,聚三氟氯乙烯+钛酸钡高介电复合材料的结晶水平降低,体系内聚合物的分子量受晶格约束而减小,聚合物分子链运动能力变好,则体系的介电损耗变大,介电性能变差。

Using differential scanning calorimetry(DSC),the dielectric properties of pure polytrifluorochloroethylene treated by176℃and 186℃heat treatment,copolymerization modification,polytrifluorochloroethylene+barium titanate were studied.The results show that,in the high-frequency alternating electric field,the polytrifluorochloroethylene obtained using the heattreatment of 186℃has better dielectric properties.The uses of low-polarity monomers modified polytrifluorochloroethylene canreduce the dielectric loss of the polytrifluorochloroethylene.As the content of barium titanate increases,the crystallization levelof the polytrifluorochloroethylene+barium titanate high dielectric composite material decreases,the molecular weight of thepolymer in the system reduces due to the restriction of the crystal lattice,and the movement capability of molecular chainbecomes better,the dielectric loss of the system becomes larger and the dielectric performance becomes worse.