聚(苯胺-吡咯)共聚物/Fe3O4网状纳米纤维复合物的制备及吸波性能

在十六烷基三甲基溴化胺（CTAB）存在下，将苯胺（An）与吡咯（Py）两种单体在Fe3O4磁流体中原位化学氧化共聚制备了PAn-co-PPy/Fe3O4网状纳米纤维复合材料。通过改变CTAB的浓度、An/Py单体的配比及Fe3O4磁流体的用量获得了形态和电磁性能可调控的纳米纤维复合物。采用SEM、TEM、XRD、TG、电导和磁性能测试对复合物进行了表征，通过矢量网络分析仪获得了试样在2-18 GHz范围的复介电常数和复磁导率，经计算获取相应的微波反射损耗曲线。结果表明共聚复合物具有比单一的聚合物、共聚物、PAn/Fe3O4及PPy/Fe3O4更优越的微波吸收性能，样品（含Fe3O412.4 wt%）在9.0 GHz处具有最大的反射损耗为 -36.5 dB，损耗超过 -10 dB的频带宽度达4.7 GHz。

Preparation and Microwave-absorbing Properties of Poly(aniline-co-pyrrole) Copolymer/Fe3O4 Network Nanofiber Composites

PAn-co-PPy/Fe3O4 network nanofiber composites have been synthesized in Fe3O4 magnetic fluid by in situ chemical oxidative polymerization of aniline (An) and pyrrole (Py) monomers in the presence of cationic surfactant cetyltrimethylammoniun bromide (CTAB). Experimental results show that nanocomposites with controllable morphology and electromagnetic properties can be obtained by varying the concentration of CTAB, molar ratio of An/Py and amount of Fe3O4. The resulting products were characterized by SEM, TEM, XRD, TG and measurements of their electrical conductivities and hysteresis loops. The complex permittivity and permeability of samples were measured on vector network analyzer in the range of 2～18 GHz, from which the reflection loss (R) curves of microwave vs frequency were calculated. The results showed that the PAn-co-PPy/Fe3O4 nanocomposites exhibit better microwave-absorbing properties than any single polymer or copolymer or PAn/Fe3O4 and PPy/Fe3O4 composites. It had a maximum reflection loss of –36.5 dB at 9.0 GHz with about 4.7 GHz bandwidth above -10 dB when the content of Fe3O4 in the composite was 12.4 wt%.