十六烷基三甲基溴化铵改性粉煤灰漂珠/聚苯胺复合材料的制备与表征  

Preparation and Characterization of Cetyltrimethylammonium Bromide Modified Fly Ash Floating Bead/Polyaniline Composites

作　　者：王悦[1] 雷西萍[1] 宋学锋[1] 蔺彦梅 

机构地区：[1]西安建筑科技大学材料与矿资学院,西安710055

出　　处：《材料导报》2014年第20期41-46,共6页Materials Reports

基　　金：国家自然科学基金青年基金(51204131)

摘　　要：不同条件下利用阳离子型表面活性剂十六烷基三甲基溴化铵(CTAB)对粉煤灰漂珠(FAFB)进行有机改性;再以苯胺(An)为单体,十二烷基苯磺酸(DBSA)为乳化剂和掺杂剂,过硫酸铵(APS)为氧化剂,利用乳液聚合法合成了有机改性漂珠/聚苯胺复合材料(FAFB-CTAB/PAn)。利用FTIR、XRD、SEM、TGA、化学元素分析和四探针技术对产物的结构与性能进行分析。结果表明:利用试验方法可得到改性效果最佳的FAFB,其中CTAB浓度为0.20mol/L,在80℃反应90min,以及CTAB改性漂珠(FAFB-CTAB)与聚苯胺(PAn)为原位复合;TGA结果说明PAn的包覆量为9.80%,且随着FAFB-CTAB的引入PAn的耐热性能增强,PAn的分解温度滞后了25℃;利用四探针技术测试发现,随着PAn的包覆,FAFB-CTAB/PAn的电导率可达到0.06S/cm,但仍处于半导体的范围。Fly ash floating bead （FAFB）was modified with the cationic surfactant cetyltrimethylammonium bro- mide （CTAB） at different conditions. The composite （FAFB-CTAB/PAn）was obtained by emulsion polymerization with aniline （An） as the monomer, dodecylbenzene sulfonic acid （DBSA） as the emulsifier and doping agent, and ammonium persulfate （APS） as oxidant. The structure and performance of the composites were analyzed by FTIR, XRD, SEM, TGA, chemical elemental analysis and four point probe technique. The results indicated that the FAFB was modified by CTAB successfully, the concentration of CTAB was 0. 20 mol/L under a nomal atmosphere for 90 min at 80℃, which was the best of given conditon in this test, and the FAFB-CTAB/PAn composites were obtained by in situ polymerization method. TGA revealed that the amount of PAn coat on FAFB-CTAB was 9.80%. The thermal stability of FAFB-CTAB/PAn composite was enhanced by 25 ℃ and that can be attributed to the introduction of FAFB. The four point probe technique test showed that the conductivity of FAFB-CTAB/PAn was 0. 06 S/cm as the polyaniline coating, but still in the scope of the semiconductor.

关 键 词：粉煤灰漂珠 聚苯胺 十六烷基三甲基溴化铵 乳液聚合 电导率 

分 类 号：TB333[一般工业技术—材料科学与工程] X705[环境科学与工程—环境工程]