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2 - amino-1 ,3 - acid - aniline copolymers and their preparation and properties of functional materials research

Author: YangDeXing
Tutor: WuXiaoDong
School: Nanjing University of Technology and Engineering
Course: Materials Science
Keywords: Poly(2-Amino-1,3 -Benzenedicarboxylic acid-aniline) Thioacetamide Conductivity Fluorescence
CLC: TB34
Type: Master's thesis
Year: 2009
Downloads: 62
Quote: 0
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Abstract


In this paper,we have reviewed the progress on conducting polyaniline,including the electrochemical polymerization,chemically oxidative polymerization,the polymerization mechanism、doping mechanism and derivatives of polyaniline、copolymerization state of polyaniline.Then,the metal-organic polymers and organic-inorganic materials were reviewed also.Poly（2-amino-1,3-benzenedicarboxylic acid-aniline）（PADCA） were obtained from the chemical polymerization of 2-amino-1,3-benzenedicarboxylic acid and aniline.The structure and properties of the PADCA copolymers were characterized by Nuclear Magnetic Resonance spectroscopy（NMR）、Fourier Transform Infrared spectroscopy（FT-IR）、Ultraviolet visible spectroscopy（UV-Vis）、X-ray diffraction（XRD） and thermogravimetry（TG）.The electrical conductivity of the PADCA copolymers falls in the range of 10-5-10-4S/cm which has dropped several magnitudes in compared with polyaniline（3.33 S/cm）.Strong florescence has been observed for PADCA copolymers.In addition the samples were observed to display in columnar morphologies.Taking into account of the great possibility of the formation of coordination bonds between carboxylic groups and that of Cu2+ ions,hydrothermal approach was utilized to prepare the coordinated counterpart of PADCA.The structure and properties of the products were characterized.Interestingly,the electrical conductivity of the coordinated species is nearly an order magnitude(in the range of 10-3 S/cm) higher than their precursors.In great contrast,the intensity of the fluorescent of the bulk drops.In the final part,the coordinated sample PADCA was functionalized in the presence of thioacetamide（TAA） and obtained a composite of PADCA/CuS.The structure and properties of the products have been characterized.It is observed that the thermal stability was improved while the intensity of the fluorescence was weakened.As high as 10 S/cm of the conductivity can be measured after functionalization,and a possible conducting mechanism was put forward.To have a better understanding of the conducting mechanism,two model compounds were designed:PAASCu(the coordination of Sodium polyacrylate（PAAS） and Cu2+ and CuCl2,which were prepared in the identical way.The characterization of the chemical structure,the morphology and the physical properties has provided some insight into the conducting mechanism of the system.

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