对苯胺及其双子衍生物1,3-二苯胺基异丙醇在1 mol/L盐酸中对碳钢的缓蚀性能进行了对比研究,探讨了通过双子衍生化提高有机分子缓蚀性能的有效性.静态失重法测得20℃下苯胺缓蚀率为85.15%～91.62%,而苯胺始终为82%左右.腐蚀动力学分析显示苯胺及其双子衍生物加入均能明显提高腐蚀反应势垒,阻碍腐蚀反应的发生,且双子衍生物阻碍效果更佳,表观活化能提高到48.94～59.59 k J/mol,高于苯胺的44.61～49.59 k J/mol.相同条件下双子衍生物缓蚀效果明显高于苯胺,原因是双子衍生化通过共价键连接拉近了两个N原子的距离,使分子中极性部位电荷密度增大,吸附能力增强,同时也使与N相连的疏水苯环距离更近,当形成吸附层时,其疏水层中苯环的密度也相应增大,阻隔效果更好.极化曲线测试结果表明,苯胺双子衍生物作为缓蚀剂可同时抑制阴阳极反应,属于混合型缓蚀剂.
A new silole monomer with two 4-（N,N-dimethylamino）phenyl substitutions on silicon atom as designed and synthesized. Three copolymers PF-N-HPS1, PF-N-HPS10 and PF-N-HPS20 were then obtained by copolymerizations of 2,7-fluorene deriva- tives with the silole monomer at feed ratios of 1%, 10%, and 20%. Their UV-vis absorption, electrochemical, photolumines- cent, and electroluminescent （EL） properties were investigated. PF-N-HPS possessed HOMO levels of -5.25-5.58 eV, and showed green emissions. Using PF-N-HPS as the emissive layer, three different polymer light-emitting diodes were fabricated as device A with ITO/PEDOT/PF-N-HPS/A1, device B with ITO/PEDOT/PF-N-HPS/Ba/A1, and device C with ITO/PEDOT/ PF-N-HPS/TPBI/Ba/A1. For the device A, PF-N-HPS only showed very low EL efficiency of 0.06-0.33 cd/A, indicating that the A1 cathode could not inject electron efficiently to the emissive polymers containing the 4-（N,N-dimethylamino）phenyl groups. For the device B, low work function Ba supplied better electron injections, and the EL efficiency could be improved to 0.85-1.44 cd/A. TPBI with a deep HOMO level of -6.2 eV could enhance electron transport and hole blocking. Thus modi- fied recombinations and largely elevated EL efficiency of 4.56-7.96 cd/A were achieved for the device C. The separation of the emissive layer and metal cathode with the TPBI layer may also suppress exciton quenching at the cathode interface.
LIU ZhiTianHU SuJunZHANG LinHuaCHEN JunWuPENG JunBiaoCAO Yong
