Premium
Modification of poly(N‐vinylcarbazole): Nitration and thermally stimulated depolarization current study
Author(s) -
Zamora Fernando,
Del Carmen Gonzalez Maria,
Del Val Juan José
Publication year - 1988
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19880200161
Subject(s) - nitration , differential scanning calorimetry , nitric acid , polymerization , glass transition , viscometer , chemistry , sulfuric acid , polymer chemistry , macromolecule , depolarization , relaxation (psychology) , analytical chemistry (journal) , materials science , organic chemistry , polymer , thermodynamics , biochemistry , physics , psychology , social psychology , viscosity , composite material , medicine , endocrinology
In order to introduce some electronic affinity in poly(N‐vinylcarbazole), we proceeded to incorporate NO 2 groups in its pendant aromatic group. Two samples obtained by different polymerization processes were chosen: a commercial sample LUVICAN (BASF) and a cationically polymerized one. Both samples were fractionated and characterized by GPC and viscometry. The first ones were treated with a sulphuric acid‐nitric acid mixture, while the second ones were nitrated in presence of dimethyl sulphoxide. The glass transition temperature and the corresponding dielectric α relaxation were studied by differential scanning calorimetry and thermally stimulated currents techniques, respectively. Rigidity of the macromolecular chain and the degree of nitration lead to different behaviour in the relaxation process.