|Title of Invention||
A WATER SOLUBLE POLYELECTROLYTE POLY-2-VINYL PYRIDINE HYDRIODIC ACID
|Abstract||According to this invention is provided a novel, water-soluble polyelectrolyte and a process for the preparation thereof. In accordance with this invention 2vinylpyridine (2VP) is thermally polymerized at 50° to 70°C for 20 to 25 hrs to obtain poly (2-vinylpyridine) (P-2VP). This 2VP has a molecular mass in the range of 4.8 x105 to 5.5 x 105 g/mol. Thereafter, a solution of P-2VP is treated with hydriodic acid at 20 to 30°C and kept in the dark. The poly-2-vinylpyridine-Hydriodic acid precipitated out is dissolved in water and purified by recrystallisation. The molecular mass of the P-2VP-HI is in the range of 11.5 x 105 to 12.0 x 105 g/mol. The conductivity of the polyelectrolyte is determined at 30 to 90°C in solid state. The addition of iodide ion (I -) increases the ionic conductivity of P-2VP and its salts. P-2VP-HI behaves as an intrinsic conducting polymer. The electrolyte when used in a voltaic cell with graphite plate and zinc metal as cathode and anode respectively produces a voltage of 1.2 volt dc. The polyelectrolyte is easy to synthesize and is soluble in water. It is recyclable as it can be reused, by adding Hydrogen Iodide (HI).|
|Full Text||- 2-
FIELD OF THE INVENTION:
This invention relates to a novel polyelectrolyte and a process for the preparation thereof.
BACKGROUND OF THE INVENTION
Polyelectrolytes are macromolecules that contain poly ions, with a large number of ionizable groups. To preserve the electronegativity of a polyelectrolyte substance the poly ion charges must be compensated by counter ions, typically ions of low molecular weight such as H+ or Na+
Unlike uncharged polymers, polyelectrolytes are usually soluble in polar solvents. They can be classified as poly acid, poly bases or if both are present, as poly ampholytes. Poly (acrylic acid), poly (methacrylic acid), Poly (vinyl sulphonic acid), Poly (p-styrenesulphonic acid), Poly (styrene-co-maleic acid), Poly (vinyl methyl ether-co-maleic acid), Poly (acrylic acid-co-maleic acid), Poly (metaphosphoric acid), Poly vinylamine, Poly (4-vinyl-N-dodecylpyridinium) chloride etc are few examples of polyelectrolytes.
The presence of a large number of charges on the same macro molecule produces some striking effects that generally are not observed in solutions containing uncharged macromolecules of comparable chemical composition, or in solution containing an equivalent concentration of unpolymerized charged monomers. As flexible chains like polymers are ionized by titration, their average configuration in solution becomes more
Extended as a result for the coulombic repulsion among the poly ion charges. The superposition of contributions from these charges produces a strong electric field, which can exert a long-range influence on other charged species in solution, especially the small mobile ions. The interaction between the poly ion and a small reference ion is generally more significant energetically than the sum of interaction between the reference ion and all other small ions (if the solution is sufficiently dilute). In the reference frame of the poly ion, the counter ions are strongly attracted to its vicinity, whereas ions carrying charges of the opposite sign (called co-ions or by-ions) are strongly repelled. These effects of the poly ion field on the radial distributions of the small ions are manifested in polyelectrolyte. In contrast to solutions of simple electrolytes, the nonideality of polyelectrolyte solutions containing added salt not only persists, but also may increase with the addition of the pure solvent, If the solution is diluted in this way, the decrease in the concentration of small ions results. As a result screening of the poly ion charges by the counter small ions will be less. So in dilute solution, interactions among poly ions may become significant and may lead to long range ordering.
Therefore, the need exists to synthesize such polyelectrolytes, in large
OBJECTS OF THE INVENTION :
It is therefore an object of this invention to propose a novel water-soluble polyelectrolyte, and a process for the preparation thereof.
It is a further object of this invention to propose a novel water-soluble polyelectrolyte and a process for the preparation thereof, which is cheaper and reusable.
It is a further object of this invention to propose a novel water soluble polyelectrolyte, by an easy, efficient and cost effective process.
These and other objects and advantages of the invention will be apparent from the ensuing description.
However, at the outset of the description, which follows, it is to be understood that the ensuing description only illustrates a particular form of this invention. However, such a particular form is only an exemplary embodiment and the teachings of the invention is not intended to be taken restrictively.
DESCRIPTION OF THE INVENTION:
According to this invention, a novel, water-soluble polyelectrolyte is synthesized and provided a novel process for the preparation of this polyelectrolyte.
In accordance with this invention 2vinylpyridine (2VP) is thermally polymerized to obtain poly-2vinylpyridine (P-2VP). This P-2VP has a molecular mass in the range of 4.8 x l05 to 5.5 x 10s 5/mol. Thereafter, a solution of P-2VP is treated with hydriodic acid and kept in the dark. The poly-2-vinyipyridine-Hydriodic acid precipitated out is dissolved in water and purified by recrystallisation. The molecular mass of the P-2VP-HI is in the range of 11.5 x 10s to 12.0 x 10s g/mol.
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The conductivity of the polyelectrolyte is determined at 30 to 90°C in solid state. The addition of iodide ion (I ) increases the ionic conductivity of P-2VP and P-2VP-HI behaves as an intrinsic conducting polymer. The electrolyte when used in a voltaic cell with graphite plate and zinc metal as cathode and anode respectively produces a voltage of 1,2 volt dc.
The polyelectrolyte is easy to synthesize and is soluble in water. It is recyclable as it can be reused, by adding Hydrogen Iodide (HI).
Dated this 12th DAY OF DECEMBER, 2006.
|Indian Patent Application Number||1350/KOL/2006|
|PG Journal Number||25/2013|
|Date of Filing||12-Dec-2006|
|Name of Patentee||NEELOTPAL SEN SARMA|
|Applicant Address||Material Sciences Division,Polymer Unit, Institute Of Advanced Study in Science and Technology,Guwahati 781035|
|PCT International Classification Number||C08F 20/00|
|PCT International Application Number||N/A|
|PCT International Filing date|