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2.3. Characterization The Fourier transform-infrared (FTIR) spectrum was obtained from a MAGNA 560 FTIR spectrometer (Thermo Nicolet Corporation, USA) using KBr discs in the range from 4000 cm−1 to 400 cm−1. Scanning electron microscopy (SEM) images were obtained using a FEI QUANTA 200 microscope. The swollen resin hydrogel were frozen in liquid nitrogen and immediately snapped and freezedried. The fractured surface of the resin hydrogel was observed. Differential scanning calorimetry (DSC) was done using a DSC2004 heat flux differential scanning calorimeter (NETZSCH, Germany) at a temperature range from 293 K to 773 K with a heating rate of 10 K/min and an argon gas flow at 40 mL/min. 2.4. Swelling and absorbency of resins in chloride and pH buffer Solutions NaCl, CaCl2, and AlCl3 solutions were prepared at different concentrations (0.1 mol/L, 0.05 mol/L, and 0.01 mol/L), where 0.1 g of the resin products was mixed with 200 mL of each salt solution. The water absorbency was measured. Buffer solutions with pH values of 2, 4, 6, 8, 10, and 12 were prepared, where 0.1 g of the resin was mixed with 200 mL of the buffer solution at different pH values. After saturation, filtered and weighed, the hydrogel characteristics were determined, and the absorbency was calculated. 2.5. Determination of biodegradability Resin sheets measuring 1 cm × 2 cm were weighed and labeled separately. The sheets were then placed in 18 PDA plates containing mycete (six plates each of Penicillium, A. niger, and L. edodes), sealed with tape, and incubated at 30 ◦C. Afterwards, the resin products were filtered, dried, weighed, and the biodegradation was observed every 3 days. |
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2.3. 表征 傅里叶变换红外（FTIR）光谱用MAGNA 560 FTIR光谱仪（Thermo Nicolet 公司，美国）获得，KBr压片的使用范围为4000/厘米〜400/厘米。用FEI QUANTA 200显微镜获得扫描电子显微镜（SEM）图像。溶胀树脂的水凝胶冷冻在液氮中，并立即折断和冷冻干燥。观察到树脂的水凝胶有断裂面。用DSC2004热通量差示扫描量热计（NETZSCH，德国）在温度范围从293K到773 K、加热速率为10K/min、氩气流量为40毫升/分钟条件下得到差示扫描量热（DSC）。 2.4. 树脂在氯化物和pH缓冲液中的溶胀和吸水性 制备不同浓度（0.1摩尔/升，0.05摩尔/升和0.01摩尔/升）的氯化钠，氯化钙，和氯化铝溶液，将0.1克树脂制品与200ml各种盐溶液混合。测定吸水性。制备pH值为2，4，6，8，10，和12的缓冲液，将0.1可树脂与200mL具有不同pH值的缓冲溶液混合。饱和后，过滤并称重，确定所述水凝胶的特性，并计算吸水率。 2.5. 树脂生物降解性的测定 取1厘米×2厘米大小的树脂片材，分别称重并标记。然后将片材置于含有霉菌的18 PDA平板（青霉属，黑曲霉，和香菇各6个平板），用胶带密封，并在30℃保温。然后，将树脂产物过滤，干燥，称重，并每3天观察其生物降解情况。 |
2楼2014-11-04 11:23:29