Structure of chemically prepared poly-(para-phenylenediamine) investigated by spectroscopic techniques

被引：75

作者：

Sestrem, Ricardo H. ^{[1
]}

Ferreira, Daniela C. ^{[1
]}

Landers, Richard ^{[2
,3
]}

Temperini, Marcia L. A. ^{[1
]}

do Nascimento, Gustavo M. ^{[1
]}

机构：

[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, BR-05513970 Sao Paulo, Brazil

[2] Univ Estadual Campinas, Dept Fis Aplicada, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

[3] Lab Nacl Luz Sincrotron, BR-13084971 Campinas, SP, Brazil

来源：

POLYMER | 2009年 / 50卷 / 25期

基金：

巴西圣保罗研究基金会;

关键词：

Diamines; Polyaniline; Raman; X-RAY-ABSORPTION; RESONANCE RAMAN-SPECTROSCOPY; OXIDATIVE POLYMERIZATION; MONTMORILLONITE CLAY; POLYANILINE; STATES; PHENYLENEDIAMINES; POLYMERS; NITROGEN; BASE;

D O I：

10.1016/j.polymer.2009.10.028

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The structure of chemically prepared poly-p-phenylenediamine (PpPD) was investigated by Resonance Raman (RR), FTIR, UV-VIS-NIR, X-ray photoelectron (XPS), X-ray Absorption at Nitrogen K edge (N K XANES), and Electron paramagnetic Resonance (EPR) spectroscopies. XPS, EPR and N K XANES data reveal that polymeric structure is formed mainly by radical cations and dication nitrogens. It excludes the possibility that PpPD chains have azo or phenazinic nitrogens, as commonly is supposed in the literature. The RR spectrum of PpPD shows two characteristic bands at 1527 cm(-1) and 1590 cm(-1) that were assigned to nu C=N and nu C=C of dication units, respectively, similar to polyaniline in pernigraniline base form. The presence of radical cations was confirmed by Raman data owing to the presence of bands at 1325/1370 cm(-1), characteristic of nu C-N of polaronic segments. Thus, all results indicate that PpPD has a doped PANT-like structure, with semi-quinoid and quinoid rings, and has no phenazinic rings, as observed for poly-o-phenylenediamine. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：6043 / 6048

页数：6

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