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2.1. Materials β-CD, acrylic acid (AA), N,N -methylenebisacrylamide (NMBA), acrylamide (AM), K2S2O8, NaCl, CaCl2, and AlCl3, were purchased from the chemical reagent development center of Kemiou Engineering (Tianjin, China). Penicillium, Aspergillus niger (A. niger), and Lentinus edodes (L. edodes) were obtained from the Laboratory of Forest Protection of Northeast Forestry University. All agents used were of analytical grade, and all solutions were prepared with distilled water. 2.2. Synthesis of ˇ-CD-based resin Cyclohexane (50 mL) and arlacel-80 (10 mL) were mixed in a 250 mL four-neck reaction bottle. Nitrogen flowed through for 10 min, and the reaction temperature was raised to 65 ◦C. Afterwards, β-CD, AA, and AM were added based on their mass ratio. NaOH (1 mol/L) solution was used to adjust the mixture to a specified degree of neutralization. The mixture was uniformly mixed to dissolve the solid samples. K2S2O8 (quantitative initiator) and NMBA (cross-linking agent) were then added dropwise using a funnel at a constant rate of 1–2 d/s with stirring. The mixture reacted under nitrogen protection. The temperature was maintained for 0.5 h after the reaction. The mixture passed through a filter, and the filtered cake was dried at 50 ◦C for 48 h until a constant weight was obtained. The cyclohexane filtrate was recycled to achieve granular resin products. A range of products were obtained by changing the reaction factors such as the mass ratio ofβ-CD, AA, and AM, the dosages of K2S2O8 and NMBA, reaction time, and neutralization degree. The optimum synthesis conditions for the super absorbent resin were explored using water absorbency in distilled water and saline solution as the evaluation indicator. |
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2.1. 材料 β-CD，丙烯酸（AA），N，N-甲基双丙烯酰胺（NMBA），丙烯酰胺（AM），过硫酸钾，氯化钠，氯化钙，氯化铝，从Kemiou工程（中国天津）化学试剂开发中心购买。青霉，黑曲霉（黑曲霉）和香菇（香菇），从东北林业大学森林保护实验室获得。所用的所有试剂均为分析纯，所有溶液均用蒸馏水配制。 2.2. β-CD型树脂的合成 环己烷（50mL）和ARLACEL-80（10毫升）混合在一个250ml四颈反应瓶中。用氮气流过10分钟，并将反应温度升高至65℃。此后，根据质量比加入β-CD，AA，和AM。用NaOH（1摩尔/升）溶液调节该混合物到特定的中和度。将混合物均匀混合，以使固体样品溶解。然后用漏斗以1-2滴/秒的恒定流量逐滴加入加入K2S2O8（定量引发剂）和NMBA（交联剂），并同时进行搅拌。在氮气保护下混合物进行反应。反应完毕后维持该温度0.5小时。反应混合物通过过滤器，在50℃干燥滤饼48小时，直到得到恒定的重量。环己烷滤液再循环，以达到粒状树脂产品。通过改变β-CD，AA和AM的质量比，K2S2O8和NMBA的剂量、反应时间，和中和度等反应的因素，得到一系列产品。用在蒸馏水和生理盐水溶液中的吸水性作为评价指标，探讨了超吸水性树脂的最佳合成条件。 |
2楼2014-11-04 10:42:57