%0 Journal Article
%T 聚合法制备木基聚苯胺半导体薄木的主要特性
%A 何文
%A 田佳西
%A 李吉平
%A 金辉
%A 孙丰文
%A 张齐生
%J 林业工程学报
%D 2016
%R 10.13360/j.issn.2096-1359.2016.03.003
%X 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2.57×10-5～9.23×10-3 S/cm,完全符合制备电磁屏蔽材料的电导率要求。</br>Recently, polyaniline(PANI)has been extensively studied as a conducting polymer because of its low cost, easy preparation, environmental stability and tunable characteristics. In this paper, the semiconducting wood-PANI veneers were synthesized via in situ polymerization of aniline monomer which was in advance impregnated into the wood. The oxidant was ammonium peroxydisulfate, and the dopant was phosphoric acid(PA). The concentration of PA ranged from 0.1 to 0.8 mol/L. Thus, the wood products obtained the conductivity of the PANI polymer and the characteristics of natural wood veneer. Light microscopy and scanning electronic microscopy images showed that PANI was uniformly dispersed in both cell lumen and cell wall of the wood veneer. The weight percentage gain and volume swelling of the semiconducting wood products were 16.13% and 6.21% respectively, when the concentration of PA was 0.6 mol/L. Water absorplion studies showed that the modified veneer was less hydrophilic, which was caused by the addition of hydrophobic PANI. The electrical conductivity of the wood-PANI composite ranged from 2.57×10-5 to 9.23×10-3 S/cm when the PA concentration ranged from 0.1 to 0.8 mol/L. The obtained electrical conductivity indicated that the composite could be used as potential material for anti-static material and shield of electromagnetic radiation, etc. Fourier transform infrared spectra revealed that PANI was closely polymerized onto the cell wall, which was realized by the accessibility of the amine groups of the aniline monomer to the hydroxyl groups of the wood material. Furthermore, X-ray diffraction analysis indicated that after the in situ polymerization of PANI, the wood cellulose maintained a classic cellulose structure, while its degree of crystallinity decreased
%K 木质单板
%K 聚苯胺
%K 电磁屏蔽
%K 原位聚合
%K 电导率&lt
%K /br&gt
%K wood veneer
%K polyaniline
%K electromagnetic shielding
%K in situ polymerization
%K electrical conductivity
%U http://lkkf.njfu.edu.cn//oa/darticle.aspx?type=view&id=201603003