接触辉光放电等离子体引发合成淀粉接枝丙烯酸超强吸水树脂

Synthesis of Starch-Graft-Acrylic Acid Superabsorbing Resin Using Contact Glow Discharge Electrolysis Plasma

采用接触辉光放电等离子体代替常规化学引发剂引发聚合反应成功地合成了淀粉接枝丙烯酸超强吸水树脂,用傅立叶变换红外光谱(FTIR)、热重分析(TGA)和扫描电子显微镜(SEM)测试技术对该吸水性树脂进行了结构表征和性能测试。采用正交设计方法研究了影响接枝反应的5个因素,考察了放电时间和放电功率对接触辉光放电强度的影响。结果表明,控制放电功率为12.8 W,放电时间为12 m in,在单体和淀粉质量比为2∶1,交联剂占淀粉和单体总量的质量分数为0.6%,后聚合温度70℃,后聚合时间3 h以及中和度为85%时,所合成的吸水树脂接枝率为47%,对蒸馏水的吸液率为765 g/g,对0.9%氯化钠溶液的吸液率为81 g/g。

Graft polymerization of acrylic acid on starch was carried out via contact glow discharge electrolysis plasma（ CGDE ）, and the product was characterized by Fourier transform infrared spectroscopy （FTIR）, thermogravimetric analysis（TGA） and scanning electron microscopy （SEM）. Five important factors for the graft polymerization were examined. For the contact glow discharge electrolysis plasma, the discharge time and the discharge power were also studied. At a discharge power of 12.8 W and a discharge time of 12 min, the optimum reaction conditions were obtained, namely, the ratio of acrylic acid to starch, the amount of crosslinking agent, reaction temperature, reaction time and neutralization of acrylic acid were 2： 1, 0. 6%, 70 ℃, 3 h and 85%, respectively. A satisfactory starch-graft-acrylic acid superabsorbing resin with a graft percentage of 47% and a high absorbency（765 g/g in distilled water, 81 g/g in 0. 9% NaCl solution） was prepared successfully.