聚合法制备木基聚苯胺半导体薄木的主要特性

发布时间：2019-03-25 11:58

【摘要】：通过对木质单板真空浸渍苯胺单体,然后使其在氧化剂和不同浓度的掺杂剂磷酸的作用下发生原位聚合反应而制备成木基聚苯胺半导体材料,此复合材料既具有聚苯胺的导电性,又具有木质材料的天然特征。光学电镜和扫描电镜显示,聚苯胺均匀地分散在木质基材中。木材的质量增加率和体积膨胀率分别为16.13%和6.21%,而且吸水率显著降低。傅里叶变换红外光谱显示苯胺单体在木质基材中发生了原位聚合反应,而且氨基与木材的羟基发生了接枝反应,与木材基质形成了紧密的界面结合。X-射线衍射分析发现,木质纤维素晶区的晶格并未遭到破坏,而木质纤维素的相对结晶度有所增加。通过改变掺杂剂的浓度,木基聚苯胺复合材料的电导率可达2.57×10-5~9.23×10-3S/cm,完全符合制备电磁屏蔽材料的电导率要求。
[Abstract]:Wood-based Polyaniline semiconductor material was prepared by vacuum impregnation of aniline monomer on wood veneer and in-situ polymerization of aniline monomer under the action of oxidant and different concentration of dopant phosphoric acid. The composite not only has the electrical conductivity of Polyaniline, but also has the natural characteristics of wood material. The results of optical and scanning electron microscopy showed that Polyaniline was uniformly dispersed in the wood substrate. The mass increase rate and volume expansion rate of wood were 16.13% and 6.21%, respectively, and the water absorption rate was significantly decreased. Fourier transform infrared spectroscopy (FTIR) showed that aniline monomer was polymerized in situ in wood substrate, and amino group was grafted onto wood hydroxyl group, which formed a close interface with wood matrix. X-ray diffraction analysis showed that there was a close interface between amino group and wood matrix. The lattice of lignocellulosic region was not destroyed, but the relative crystallinity of lignocellulose increased. By changing the concentration of dopant, the conductivity of wood-based Polyaniline composites can reach 2.57 脳 10 ~ (5) ~ 9.23 脳 10 ~ (- 3) S 路cm ~ (- 1), which fully meets the requirements of preparing electromagnetic shielding materials.
【作者单位】：南京林业大学材料科学与工程学院;南京林业大学生物与环境学院;南京林业大学(泗阳)杨木加工利用技术研究院;
【基金】：国家自然科学基金项目(31300476) 江苏省自然科学基金项目(BK20140971) 江苏苏北富民强县项目(BN2014069)
【分类号】：TB33

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