磺酸盐型水性聚氨酯/聚吡咯导电材料的原位制备与电阻性能

摘要

A series of waterborne sulfonate polyurethanes dispersions (SWt'U) was prepared through prepoty- merization method by reacting polyethylene glycol (PEG1000) and isophorone diisocyanate (IPDI) with 2,4-dia- mind-benzene sulfonie acid sodium salt (DASS) as chain extender. Then FeCI3 was employed as oxidant, therefore SWPU/polypyrrole (SWPU/PPy) conductive composite was prepared by in situ ehemical oxidative poly- merization of pyrrole (Py) in SWPU dispersions. The effects of different preparative conditions including feeding ratios, feeding sequences and reaction conditions on the conductivity of SWPU/PPy conductive composite were studied. Fourier infrared spectra demonstrated the presence of hydrogen-bonding interactions between SWPU and PPy. Results also showed that SWPU/PPy resistivity can achieve 1Ω·cm, when feeding sequence: SWPU →Py→FeCl3, Py concentration was 30%, reaction temperature was 0℃, reaction time was 3h and n (FeCl3) / n (Py) =2.2.%以聚乙二醇（PEG1000）、异佛尔酮二异氰酸酯（IPDI）以及2,4-二氨基苯磺酸钠（DASS）为原料,通过预聚体法合成了磺酸盐型水性聚氨酯分散液（SWPU）。再以FeCl3为氧化剂,采用原位化学氧化聚合法使吡咯（Py）在SWPU中聚合,制备了磺酸盐型水性聚氨酯/聚吡咯（SWPU/PPy）导电复合材料。研究了制备条件（如投料比和投料顺序）、反应条件等对磺酸盐型水性聚氨酯/聚吡咯（SWPU/PPy）导电复合材料电阻性能的影响。红外光谱图表明PPy与SW-PU分子间存在氢键缔合。实验结果亦表明,最佳制备条件为：Py浓度为30%,n（FeCl3）（Py）=2.2,投料顺序为SWPU→Py→FeCl3,反应温度0℃（冰浴）,反应时间为3h,SWPU/PPy电阻率可达到1Ω·cm。