- Synthesis and characterisation of water dispersible copolymer submicron spheres of poly-(phenylenediamine-co-N-sulfopropyl aniline) via random copolymerisation
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The homopolymers of poly-phenylenediamines (P-PD's) and poly-N-sulfopropyl aniline (PSPA) were synthesized via chemical oxidative polymerization of phenylenediamine monomers and sulfopropyl aniline using ammonium persulfate as oxidizing agent in acidified medium. Three homopolymers of phenylenediamines synthesised were poly (m-phenylenediamine) P-MPD, poly (p-phenylenediamine) P-PPD and poly (o-phenylenediamine) P-OPD. Poly-N-sulfopropyl aniline (PSPA) is a self doped water soluble conducting polymer. Random copolymerization of N-sulfopropyl aniline and phenylenediamines would enhance the solubility of the copolymer nanomaterials. Three different copolymer compositions (COP25, COP50 and COP75) were employed for copolymer synthesis based on weight percentage of co-monomer's feed taken. Homopolymers and copolymers were characterized by fourier-transform infrared spectroscopy (FT-IR) and elemental analysis. The UV-Visible absorption spectra of the samples in water were shown the characteristic polaron- π?and π-π?peaks. The solid state ordering of the samples recorded by powder wide angle x-ray diffraction studies reveals that homopolymer samples were partially crystalline, whereas copolymers were either amorphous or less crystalline than homopolymer. Morphological features of the polymers and copolymers were recorded by scanning electron microscope (SEM). Poly (m-Phenylenediamine) was present as uniformly distributed submicron spheres with an average size of 850 ± 50 nm, whereas the poly (p-phenylenediamine) was present as non-uniform spheres with size in the range 600 ± 100 nm. The P-OPD sample was highly crystalline and it has shown some ordered rod like structures. Interestingly, all copolymer samples like M-COP25, P-COP25, and O-COP25 were formed as uniform submicron spheres. Poor water solubility of poly-phenylenediamines in aqueous solution was increased tremendously upon copolymerization.
- Rohini Das,Jinish Antony
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- Polyaniline nanoscaffolds for colorimetric sensing of biomolecules via electron transfer process
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Biologically important analytes such as cysteine and vitamin-C were detected by electron transfer (ET) via naked eye colorimetric sensing using a tailor-made watersoluble vself-doped polyaniline (PSPANa) as a substrate. Monomer (N-3-sulfopropylaniline) was synthesized via ring-opening of propane sultone with excess aniline and polymerized in water using ammoniumpersulfate to obtain green water-soluble polymer. Vitamin-C (ascorbic acid) and cysteine showed unexpected sharp and instantaneous color change from blue to colorless sensing action. The stoichiometry of the analyte to polymer was determined as 3:2 and 4:1 with association (or binding) constants of K = 2.1 × 10 3 and 1.5 × 103 M-1 for vitamin-C and cysteine, respectively. Efficient electron transfer from vitamin-C (also cysteine) to the quinoid unit of the polyaniline base occurred in solution; as a result, the color of the solution changed from deep blue to colorless. Cyclic voltammetry analysis of PSPANa showed the disappearance of the cathodic peak at -0.21 V upon the addition of analytes (vitamin-C and cysteine) and confirms the electron transfer from the analyte to the polymer backbone. Dynamic light scattering (DLS) and zeta potential techniques were utilized to trace the molecular interactions in the electron transfer process. DLS histograms of the polymer samples confirmed the existence of nanoaggregates of 8-10 nm in diameter. The polymers possessed typical amphiphilic structure to produce micellar aggregates which facilitate the efficient electron transfer occurred between the analyte and polyaniline backbone.
- Antony, M. Jinish,Jayakannan
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- LUMINESCENT SQUARAINE ROTAXANE COMPOUNDS
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Luminescent reporter compounds that are rotaxanes having the structure where B—Z—C is a reporter molecule based on a squaraine type molecule, or similar reporter, and K is a macrocycle that encircles and interlocks with the reporter molecule. Applications of the reporter compounds are provided, as well as reactive intermediates used to synthesize the reporter compounds, and methods of synthesizing the reporter compounds.
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Paragraph 0122-0123
(2019/02/24)
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- A sulfamic acid and its preparation method and application (by machine translation)
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The invention discloses a amino sulfonic acid and its preparation method and application. Of amino sulfonic acid preparing method is sulfonic acid lactone solvent dilution in, then dropwise added to the system in the primary amine, in the 25 - 80 °C reaction 4 - 24 h, then the reaction product filtering, washing, drying the obtained solid product; and then the product with the multi-isocyanate reaction to prepare the aqueous polyurethane curing agent, the curing agent has low viscosity, it is easy to disperse, NCO % higher, the advantages of the good matching with a hydroxyl group. The invention amino sulfonic acid and aqueous polyurethane of simple preparation process, mild reaction conditions, preparation of the curing agent to the aqueous hydroxy resin compound for preparing the two-component water-based polyurethane coating has good water resistance, gloss and the like. (by machine translation)
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Paragraph 0060-0067
(2019/07/04)
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- LUMINESCENT COMPOUNDS
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Luminescent reporter compounds that are rotaxanes having the structure where B—Z—C is a reporter molecule based on a cyanine, squaric acid, or other reporter, and K is a macrocycle that encircles and interlocks with the reporter molecule. Applications of the reporter compounds are provided, as well as reactive intermediates used to synthesize the reporter compounds, and methods of synthesizing the reporter compounds.
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- Electrocatalysisi of the quinone/hydroqainone system by electrodes coated with substituted polyaniline
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Polymer films derived from N-methylaniline (NMA), N(3-sulphopropyl)-aniline (NSPA), 2- and 3-iriethylanilines (2-MA and 3-MA), and 2,3-, 2,5- and 2,6-dimethyianilines (2,3-DMA, 2,5-DMA and 2,6-DMA), as well as of some copolymers, were obtained on a platinum electrode in acidic solution by potential cycling. Elecirocatalytic properties of the resulting polymer coated electrodes towards the hydroquinone-benzoquinone redox couple were investigated. The following sequence of catalytic activity was found: poly(2-MA) poly NMA = copoly (2-MA + 3-MA) >copoly(NMA + NSPA) > polyNSPA poly(3-MA). With respect to the stability of catalytic effects observed at prolonged potential cycling, the following sequence can be drawn: poly(2-MA)>pclyNSPA >copoly(2-MA + 3-MA) = poly(3-MA)>copoly(NMA + NSPA)>polyNMA. Thus, poly(2-MA) was found to be the most effective and stable electrocatalyst in the redox couple investigated. The polymers derived from dimethylanilines were found to inhibit this redox process. VCH Verlagsgesellschaft mbH, 1996.
- Malinauskas, Albertas,Holze, Rudolf
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p. 1740 - 1745
(2007/10/03)
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