In this article, we report the preparation of
conducting natural rubber (NR) with polyaniline (Pani). NR
was made into a conductive material by the compounding
of NR with Pani in powder form. NR latex was made into a
conductive material by the in situ polymerization of aniline
in the presence of NR latex. Different compositions of Pani-
NR semi-interpenetrating networks were prepared, and the
dielectric properties of all of the samples were determined
in microwave frequencies. The cavity perturbation techpique was used for this study. A HP8510 vector network analyzer
with a rectangular cavity resonator was used for this
study. S bands 2-4 GHz in frequency were used. Thermal
studies were also carried out with thermogravimetric analysis
and differential scanning calorimetry.
Rinku Mariam, Thomas; Dr.George, K E; Dr.Mathew, K T; Dr.Prathapan, S(Cochin University of Science & Technology, May , 2005)
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Abstract:
The thesis deals with the preparation and dielectric characterization of
Poly aniline and its analogues in ISM band frequency of 2-4 GHz that includes part
of the microwave region (300 MHz to 300 GHz) of the electromagnetic spectrum
and an initial dielectric study in the high frequency [O.05MHz-13 MHz].
PolyaniIine has been synthesized by an in situ doping reaction under different
temperature and in the presence of inorganic dopants such as HCl H2S04, HN03,
HCl04 and organic dopants such as camphorsulphonic acid [CSA],
toluenesulphonic acid {TSA) and naphthalenesulphonic acid [NSA]. The variation
in dielectric properties with change in reaction temperature, dopants and
frequency has been studied. The effect of codopants and microemulsions on the dielectric properties has also been studied in the ISM band. The ISM band of
frequencies (2-4 GHz) is of great utility in Industrial, Scientific and Medical (ISM)
applications. Microwave heating is a very efficient method of heating dielectric
materials and is extensively used in industrial as well as household heating
applications.
Description:
Department of
Polymer Science and Rubber Technology,Cochin University of Science and
Technology
Poly(6-tert-butyl-3,4-dihydro-2H-1,3-benzoxazine) was synthesized by
thermally activated cationic ring opening polymerization. The structure of the
polymer was confirmed by spectral and thermal studies. The highest occupied
molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were
estimated using cyclic voltammetry and optical absorption. Modulated photocurrent
measurement technique was employed to study the spectral and field dependence of
photocurrent. Photocurrent of the order of 1.5 micro A/m2 was obtained for polymer at a
biasing electric field of 40 V/mico m.