辐照丙烯酸接枝HDPE/TiO_2复合物的微波介电性能研究

Study of dielectric properties in microwave frequency on irradiation HDPE/TiO_2 composites grafted by acrylic acid

研究了不同剂量的60Co γ射线对丙烯酸接枝HDPE/TiO2复合物的凝胶率、接枝率、应用频率及温度对微波下复合物介电常数及介电损耗的影响,研究表明,同时采用辐照及丙烯酸接枝两种方法改性的HDPE/TiO2复合物,在微波下有较高的介电常数(ε′≈30)及较低的介电损耗正切(tgδ≈3×10-3),这对微波通信有重要的应用价值。另一方面,扫描电子显微镜(SEM)的微观形态分析表明丙烯酸接枝复合物经辐照后其表面为网状结构。

The effect of HDPE/TiO_2 composites grafted by acrylic acid (AA) with different irradiation doses on the gel fraction, grafting rate, application frequency, and temperature were reported, the dielectric constant and dielectric loss tangent (tgδ) were studies for the composites in microwave frequency band. The results showed that the HDPE/TiO_2 composites irradiated were grafted simultaneously have higher dielectric constant (ε′≈30) and lower dielectric loss tangent (tgδ≈3×10^(-3)), it was very important value for the microwave communication. On the other hand, the SEM micrographs of composite show that the interfacial interaction between HDPE and TiO_2 were network structure after composite irradiated and grafted by AA.