Preparation and characterization of composite polyaniline/poly(vinyl alcohol)/palygorskite

被引:13
作者
Rodrigues Oliveira, Marilia Evelyn [1 ]
Santos, Leandro de Miranda [1 ]
de Gois da Silva, Mirna Luciano [2 ]
da Cunha, Helder Nunes [3 ]
da Silva Filho, Edson Cavalcanti [1 ]
da Silva Leite, Cleide Maria [4 ]
机构
[1] Univ Fed Piaui, Grad Program Mat Sci, BR-64049550 Teresina, PI, Brazil
[2] Univ Fed Piaui, Grad Program Pharmaceut Sci, BR-64049550 Teresina, PI, Brazil
[3] Univ Fed Piaui, Grad Program Phys, BR-64049550 Teresina, PI, Brazil
[4] Univ Fed Piaui, Ctr Nat Sci, Dept Chem, BR-64049550 Teresina, PI, Brazil
关键词
Composite materials; Thin films; Electrical characterization; Thermal analysis; AQUEOUS-SOLUTION; NANOCOMPOSITES; POLYANILINE/CLAY; MORPHOLOGY; REMOVAL; BLENDS; ACID;
D O I
10.1007/s10973-014-4117-4
中图分类号
O414.1 [热力学];
学科分类号
摘要
The preparation of composites occurred by insertion of organically modified molecules, using quaternary ammonium salts-Cetremide (cetyl trimethyl ammonium bromide, CTAB) and Genamim (cetyl trimethyl ammonium chloride, CTAC)-in the fibrous structure of the palygorskite clay (PALY). For the preparation of PANI/PVA (polyaniline/poly(vinyl alcohol), PANI/PVA/PALY, PANI/PVA/PALY-CTAB, and PANI/PVA/PALY-CTAC films, the "casting" technique was used, and they were characterized by XRD, FTIR, SEM, TG/DTG, and DSC. The XRD and FTIR data suggest that there was the incorporation of characteristic groups of the ammonium salts was incorporated on the clay. The TG/DTG curves showed that the decomposition occurred with natural and organophilic PALY showing a thermal stability profile. The incorporation of PALY to the blend PANI/PVA affected the thermal profile, and the DSC curves of the PANI/PVA/PALY suggest that the incorporation of polymers in the PALY structure decreases the crystalline fraction of the material. Through electrical impedance spectroscopy with alternating current, we observed that the blend of composites PANI/PVA with clay PALY-CTAC is more conductive presenting electric conductivity at low frequencies around 6.0 x 10(-4) S cm(-1), whereas in the films with the clay PALY-CTAB conductivity reaches 1.4 x 10(-6) S cm(-1), that is approximately four times smaller. It was observed that films with clay and those that are doped become much more conductive than the electrical blend of PANI/PVA doped as well.
引用
收藏
页码:37 / 46
页数:10
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