Abstract:Two types of conducting polymer composites comprising polypyrrole (PPy) (filler) dispersed in a polyimide (PI) (matrix) and bilayered conducting polymer/PI composites, were successfully formulated. Electrochemical deposition of the PPy/PI composite was accomplished by initially depositing PPy onto the working electrode, and then casting a layer of PI onto the modified electrode. The PPy/PI composite was also formulated by first casting a PI film onto the bare electrode followed by electrochemical deposition of… Show more
“…The C–N stretching vibration of imine ring is located at 1365 cm −1 . The peaks at 1495 and 1598 cm −1 can be assigned to the C=C stretching vibrations of benzenoid and quinonoid rings, respectively [22,23]. Figure 2 FT-IR spectra of treated Kapton under different conditions.…”
The preparation of inorganic coatings on polymer surfaces to improve their performance is a frequently used method. However, the cracking and falling off of the coatings caused by different thermal expansion coefficients or poor adhesion between the coatings and polymer substrates need to be solved. In this paper, the preparation of a SiO x coating with a lot of micro-nanometre wrinkles is proposed, using the scalability of wrinkles to alleviate or eliminate the stress. The wrinkled coating is prepared on the polyimide surface by a sol forming process. Environmental simulation tests showed that the coatings exhibit resistance to moisture and temperature change, and have a good anti-atomic oxygen performance.
“…The C–N stretching vibration of imine ring is located at 1365 cm −1 . The peaks at 1495 and 1598 cm −1 can be assigned to the C=C stretching vibrations of benzenoid and quinonoid rings, respectively [22,23]. Figure 2 FT-IR spectra of treated Kapton under different conditions.…”
The preparation of inorganic coatings on polymer surfaces to improve their performance is a frequently used method. However, the cracking and falling off of the coatings caused by different thermal expansion coefficients or poor adhesion between the coatings and polymer substrates need to be solved. In this paper, the preparation of a SiO x coating with a lot of micro-nanometre wrinkles is proposed, using the scalability of wrinkles to alleviate or eliminate the stress. The wrinkled coating is prepared on the polyimide surface by a sol forming process. Environmental simulation tests showed that the coatings exhibit resistance to moisture and temperature change, and have a good anti-atomic oxygen performance.
“…= weight of copolymer after drying Percentage conversion weight of monomers taken ×100 (5) The nomenclature of the samples prepared with different synthesis conditions and their corresponding percentage conversions are given in Table 2.…”
Section: Percentage Conversion Of Copolymersmentioning
confidence: 99%
“…Hence, the functional monomers with polymerizable double bonds serve as fascinating materials for synthesizing a complex copolymer with a polyfunctional macromolecular archi tecture, with specific composition and properties. There fore, copolymerization offers feasibility to a chemist to design material to meet the requirements for applications like photovoltaic cell, diodes and polymeric batteries [1][2][3] and also material with optically active properties, electromagnetic shielding properties [4][5][6], display prop erties, etc. Thus, the inbuilt heterogeneity of material via copolymerization has stimulated researchers to concen trate on nonconducting materials to improve their physi cal, mechanical and thermal properties.…”
Copolymerization of pyrrole and aniline was carried out using chemical methods. The synthesis was carried out at different temperatures for different pro portions of the monomers. The monomer reactivity ratios for pyrrole and aniline were calculated as 5.2 and 0.19, respectively, by using the low conversion analysis method. In addition, the same was done for two different concentrations of the initiator. The graphs for percentage conversion were plotted for various combinations of tem perature, feed ratio and initiator concentration. Thus, an effort was made to study the impact of various parameters on the process of copolymerization.
“…7 However, all organic coatings are permeable to corrosive species such as oxygen, water and ions to some extent in practice. [8][9][10][11] In the last few years, investigations of the preparation of fluoropolymer coatings have been considered due to its characteristic of the fluoropolymer coatings, such as weather resistance, excellent chemical resistance, low surface energy and so on. 12,13 Nevertheless, there have been few reports about fluoropolymer coatings modified by nanoparticles so far.…”
The surfaces of nanoparticles of SiO 2 , TiO 2 and Al 2 O 3 have been modified by γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH-560) in order to achieve proper dispersion of nanoparticles and possible chemical interactions between nanoparticles and polymeric coatings, and then the homogeneous fluoropolymer coatings containing nanoparticles of SiO 2 , TiO 2 and Al 2 O 3 have been successfully prepared on mild steel substrates. The surface morphologies of the coatings were characterised by field emission scanning electron microscopy. The effects of incorporating various nanoparticles on the corrosion resistance of fluoropolymer-coated steel were investigated by potentiodynamic polarisation curve, electrochemical impedance spectroscopy and salt spray tests. The results showed that KH560-modified nanoparticles can decrease agglomeration effectively, and the nanoparticles play a beneficial role in improving the corrosion resistance of the coated steel significantly. In addition, SiO 2 nanoparticles are of the best effect among three kinds of nanoparticles.
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