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    題名: Synthesis and properties of chitosan-modified poly(acrylic acid)
    作者: Chuang, Chung-yang;董崇民;Don, Trong-ming;Chiu, Wen-yen
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: copolymerization;modification;radical polymerization;swelling;thermal properties
    日期: 2008-09
    上傳時間: 2010-08-09 18:23:20 (UTC+8)
    出版者: Hoboken: John Wiley & Sons, Inc.
    摘要: Potassium persulfate (K2S2O8) was used to initiate the polymerization of acrylic acid (AA) monomer in a chitosan (CS) solution. Both a poly(acrylic acid) (PAA) homopolymer and a CS-co-PAA copolymer were produced. When the amount of AA was increased from 5 to 40 g with 5 g of CS, the total monomer conversion was found to increase from 89 to 98% after 2 h of reaction at 70°C. In addition, the percentage of reacted AA monomer being converted to the CS-co-PAA copolymer (copolymerization efficiency) and the weight composition of the PAA portion in the copolymer (copolymer composition) both increased with the amount of AA added. The structures and properties of the synthesized CS-modified PAA polymers were studied. In Fourier transform infrared spectra, the formation of a polyelectrolyte complex between CS chains and PAA chains could be observed. From the thermograms obtained via differential scanning calorimetry, we found that the presence of rigid CS chains increased the glass-transition temperature of PAA. Thermogravimetric analysis revealed three stages of degradation of the synthesized CS-modified PAA polymers. The swelling ratio of the CS-modified PAA polymers depended on the pH value and had a maximum value in a buffer solution at pH 7. This was due to the changes in the morphological structure with the pH value.
    關聯: Journal of Applied Polymer Science 109(5), pp.3382-3389
    DOI: 10.1002/app.28420
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文

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