Graft Copolymerization of Artemisia Seed Gum with Acrylic Acid under Microwave and its Water Absorbency |
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| Authors: | Ji Zhang Shengtang Zhang Kun Yuan |
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| Institution: | 1. Gansu Key Laboratory of Polymer Materials , Northwest Normal University , Lanzhou, China;2. College of Life Science, Northwest Normal University , Lanzhou, China;3. Gansu Key Laboratory of Polymer Materials , Northwest Normal University , Lanzhou, China |
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| Abstract: | A super‐absorbent polymer was prepared by grafting copolymerization of acrylic acid onto Artemisia seed gum, using microwave irradiation and ammonium persulfate as an initiator. The effect of various preparation conditions on its water absorbency, such as the ratio of acrylic acid to Artemisia seed gum, degree of acrylic acid neutralization, amount of initiator and microwave irradiation time, was investigated by orthogonal tests. The optimal reaction conditions were 3 min (irradiation time), 70% neutralization degree of acrylic acid and 2% initiator on the basis of the mass of acrylic acid used. When the mass ratio of acrylic acid to Artemisia seed gum is 5:0.5, the product has a water absorbency close to 400 times at room temperature in distilled water, this indicated that is has a high water absorbency. The structure of the graft copolymer was confirmed by Fourier transform infrared spectrometer (FT‐IR) and thermogravimetric analysis (TGA). Further more, this microwave irradiation processing method to prepare water absorbent materials has no industrial cast off produced, that is to say, this method is environmentally friendly. |
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| Keywords: | graft copolymerization super‐absorbent acrylic acid Artemisia seed gum microwave irradiation |
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