Search In this Thesis
   Search In this Thesis  
العنوان
Synthesis, characterization and Electrical properties of some
conducting polymers /
المؤلف
EL-Mekawy , Sameh Araby Atia Elewa.
هيئة الاعداد
باحث / سامح عربي عطية عليوه
مشرف / محمود عبد الغفار
مشرف / عيشه امام محمد علي
مناقش / جابر محمود عز الدين
مناقش / محمود عبد الغفار
الموضوع
conducting polymers.
تاريخ النشر
2013.
عدد الصفحات
141 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
Physical and Theoretical Chemistry
تاريخ الإجازة
1/1/2013
مكان الإجازة
جامعة قناة السويس - كلية العلوم - كيمياء
الفهرس
Only 14 pages are availabe for public view

from 162

from 162

Abstract

In this study, conductive homopolymers of aniline and anthranilic acid were
synthesized chemically and electrochemically in acidic solution and their properties
were analyzed. Studies of chemical and electrochemical co-polymerization of aniline
and anthranilic acid with carboxylic group were also performed. Chemical
polymerization produces polymers in the form of powder while electrochemical
polymerization leads to form homogeneous films. Chemical polymerization and
doping process occurs concurrently in a single step. IR spectra and 1H NMR were
taken in order to analyze the structural properties of the resulting polymers. The
crystallinity of the samples was examined by powder X-ray diffraction technique. The
obtained results reveal the amorphous nature of synthesized P(ANA-co-ANI) copolymer
while PANI and PANA are semicrystalline in structure. The thermal
properties of chemically prepared polymers were studied using thermogravimetric
analysis (TGA) and differential scanning calorimetry (DSC). Thermo gravimetric
analysis results indicated that the decomposition of the two homopolymers and the
copolymer of them involves three stages. The surface morphology of the resulting
polymers was characterized by scanning electron microscope (SEM). The specific
capacities (Sp.C) of the chemically prepared polymers were determined. Sp.C of the
PANA-PANI co-polymer reaches up to 1856 Fg−1. The conductive polymers aniline
and anthranilic acid were then synthesized electrochemically under a nitrogen
atmosphere using a potentiostat. The conducting polymers were deposited
electrochemically using cyclic voltammetry (CV). Initially, the oxidation potential
values of these monomer solutions were determined by CV. The surface morphology
of the resulting homo and co-polymer films was characterized by scanning electron
microscope and the effect of monomers molar ratios on specific capacity were
characterized using cyclic voltammetry in acidic and neutral solutions. Sp.C of the
electrochemically prepared polymers were determined in both acidic and neutral
medium. Based on the resulting specific capacity data, it was concluded that PANA
has higher specific capacity than PANI. SEM images showed that the morphology of
polymer films was homogeneous and the particle size in the range of 150-250
nanometers