Preparation and characterization of co hydrogel (Vinyl Pyrrolidone- Methacrylic acid) by free radical polymerization method

Subject Areas : The Application of Chemistry in Environment

amir  sepehrian azar ¹ (Department of Chemistry, Islamic Azad University OF AHAR, Ahar, Iran)
afsaneh  mohammadpour ² (islamic university of ahar, ahar, iran)
hamed  elmi ³ (M.S.c , Islamic Azad University of tehran, Tehran, Iran.)

Received: 2019-07-18 Accepted : 2020-12-14 Published : 2019-06-22

Keywords: hydrogel, Polymerization, Swelling, TGA,

Abstract :

Hydrogels are three dimensional polymers that do not dissolve in water, but they swell. One of the most important physical properties of hydrogels is their swelling in water [1]. Polyvinylpyrrolidone is widely used for its biocompatibility behavier [2]. Methacrylic acid also has many uses due to its COOH group. In this project, co hydrogel (vinyl pyrrolidone-methacrylic acid) was prepared by using free radical polymerization at 65 ° C for 5 hours and45 minutes using AIBN as a initiator and methylene bis acrylamide as a crosslinking agent. Then, at different pH and different temperatures and intensity of different ions, the maximum swelling at pH = 12 and in the ratio 1: 1,8000%, and the minimum swelling at pH=12 in ratio 1:2 was obtained. To identify the structure we use FTIR and for thermal identification we use T.G.A. And the maximum degradation for these hydrogels was at 75 ° C due to the high swelling rate.