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Preparation of Hydrogel Based on acryl Amide and Investigation of Different Factors Affecting Rate and Amount of Absorbed Water

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Agricultural Sciences 2017年第2期8卷 161-170页

作者： Mostafa A. Radwan Omar H. Al-Sweasy Hany A. Elazab Chemical Engineering Department The British University in Egypt BUE Cairo Egypt

Hydrogel is considered as an important material in our world nowadays as it is used in many important and significant applications such as in tissue engineering and agriculture. There are hundreds of types of such materials, where most of them can be easily prepared. The main objective of this work is to prepare one of the hydrogel types which could be very useful in the agriculture of deserts where plants in dry places require water in order to grow up. There are many places around the world where raining occurs only once or twice a year. There are also places where it does not rain at all. Therefore, hydrogels are required in order to absorb water in large quantities either during raining or irrigation instead of escaping to underground and then eject them to the roots of plants over time as the plants require watering. In this research a hydrogel based on acryl amide, Poly 2-acrylamide-2-Methyl-1-Propane Sulphonic Acid, (PAMPS) was prepared by using different percentages of a suitable cross-linking agent, Methylene-bis-acrylamide. The cross-linker content is very important factor affects the rate and amount of absorbed water. The highest amount of absorbed water at 25°C was observed by using 0.6% cross-linking agent based on monomer mass. The temperature of absorbed water and its pH value are also essential factors that affect the rate and the amount of absorbed water and were investigated in this work. The highest amount of absorbed water was recorded at pH = 12 and at 60°C. The amount and the rate of water absorbed by Sodium Polyacrylate Hydrogel were also investigated at 25°C. The agriculture applications of hydrogel based on Sodium Polyacrylate were examined using Fenugreek seeds implanting.

关键词： Hydrogel acryl Amide Poly 2-acrylamide-2-Methyl-1-Propane Sulphonic Acid (PAMPS) Cross-Linking Agent Sodium Polyacrylate Hydrogel

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Preparation and Characterization of Functionalized Polypropylene with acrylamide and Itaconic Acid

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Journal of Materials Science and Chemical Engineering 2014年第10期2卷 43-51页

作者： A. R. Oromiehie H. Ebadi-Dehaghani K. Ansari K. Karimi Z. Rahmani S. Mirbagheri Iran Polymer and Petrochemical Institute Tehran Iran Shahreza Branch Islamic Azad University Shahreza Iran

Functionalized polypropylene with acryl amide (AAm) and itaconic acid (IA) were prepared in the molten state in the presence of dicumyl peroxide. The effects of the concentration of both mono- mers on the degree of functionalization and properties of the products were investigated by FT-IR, contact angle measurement and DSC analysis. It was found that the degree of functionalization depends on the initial concentration of both monomers that used in the reaction. The influence of the AAm and IA content on the melting and crystallization temperature of PP was investigated by DSC. The contact angle of water on film surfaces of the functionalized PP (PP-g-AAm and PP-g-IA) decreased with increasing modified polymer content. From FT-IR spectra of functionalized PP a calculation was made of carbonyl index on the films surfaces. It was found that the higher intensity of the carbonyl index, the lower contact angle value and the lower crystallinity confirmed the ex- istence of functionalized AAm and/or IA in PP. It was concluded from the different characteriza- tion methods that the polarity and percentage of functionalized PP were increased up to 3 phr for both monomers, and then it was decreased by increasing the amount of monomers and had a threshold value, due to nucleating agents of monomers in PP.

关键词： Functionalized Polypropylene acryl Amide Itaconic Acid FT-IR Contact Angle

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