Full
WANG Chen (1963-), female, Ph.D., Professor. E-mail: wangchen2231@xpu.edu.cn
Outline
Calcium polyphosphate (CPP) was modified via the Schotton-Baumann acylation reaction using 12-aminododecanoic acid (12-AA) and acryloyl chloride as main raw materials. The effects of hydrothermal reaction time and 12-AA dosage on the modification process of CPP were investigated. They were characterized by Fourier infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The particle size, contact angle and thermal stability of CPP were also determined. The results show that the yield of CPP-modified increases with increasing the hydrothermal reaction time and 12-AA content. In the acylation process, the pH value decreases as the reaction time increases until stable (i.e., a weak acidity, pH 6.2). A greater yield (i.e., 56.70%) and the smaller particle size (i.e., 588.3±119.7 nm) of modified CPP are obtained when a molar ratio of CPP to 12-AA is 1∶3 and the reaction time is 12 h. The contact angle before and after the modification increases from 2 to 61.41 degrees. Based on the results by thermogravimetric analysis, the CPP has a good thermal stability with little mass loss at <592.92 ℃. However, the modified CPP still has a good thermal stability and shows an obvious mass loss at 426.68-461.66 ℃.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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