【摘要】 用乳液聚合法合成了三种不同丙烯酸含量的苯乙烯-丙烯酯丁酯-丙烯酸三元共聚物母料。通过中和反应制备出具有不同离子含量和不同金属反离子的系列离聚体。用DP-Ⅱ型介电谱仪进行介电性能测量,得出:共聚物母料的介电常数ε_r值较高,损耗角正切tanδ的α和β两个峰叠合成一个。离子化后,α和β两峰独立存在;随离子化程度提高,ε_r值下降,α和β峰都向高温移动;随同价反离子的半径增加,ε_r值增大,β峰向低温移动,但α峰变化不大。更多还原

【Abstract】 Three styrene-butyl acrylate-acrylic acid random copolymers with different proportions of acrylic acid were synthesized by emulsion polymerization. By neutralization, a series of ionomers with different proportions of ions and different metal counterions were prepared. The dielectric properties of the sample so obtained were investigated with a DP- I dielectric spectra detector. It was found that the α and β peaks of the dielectric loss tangent (tg δ) coincided like a single peak and with higher permittivities (εr),if the unneutralized copolymers were used as the parent materials. As ionization was increasing, the permittivities (εr) decreased and the α,β peaks shifted toward the higher temperature.更多还原