为了降低三酚基甲烷型环氧树脂(TMP)的黏度,通过不同的合成工艺得到了低黏度芳香族超支化环氧树脂(AHBP),采用傅里叶变换红外光谱仪对其表征。将AHBP作为TMP稀释剂,研究了AHBP加入量对TMP/甲基纳迪克酸酐(MNA)体系性能的影响,并与传统...为了降低三酚基甲烷型环氧树脂(TMP)的黏度,通过不同的合成工艺得到了低黏度芳香族超支化环氧树脂(AHBP),采用傅里叶变换红外光谱仪对其表征。将AHBP作为TMP稀释剂,研究了AHBP加入量对TMP/甲基纳迪克酸酐(MNA)体系性能的影响,并与传统稀释剂1,4-丁二醇二缩水甘油醚(BDDGE)进行比较。采用热重分析仪及电子万能试验机对其性能测试。当AHBP含量为15%时,体系黏度为2800 m Pa·s左右,拉伸强度、弯曲强度、冲击强度分别提高了12%,13.2%,40%,起到了增韧效果,热失重5%时温度为313.9℃;而BDDGE/TMP/MNA体系的力学性能及热性能下降显著。结果表明相对于BDDGE,AHBP在不降低TMP力学性能的情况下能较好地降低TMP黏度。展开更多
This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering...This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).展开更多
This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the p...This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate is titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied for the determination of chlordiazepoxide raw materials with satisfactory results. The recovery is between 99.58% and 100.4%, the relative error is less than ± 0.50% . Experiments show that the method gives the same results as the approach using nonaqueous titration (ChP).展开更多
文摘为了降低三酚基甲烷型环氧树脂(TMP)的黏度,通过不同的合成工艺得到了低黏度芳香族超支化环氧树脂(AHBP),采用傅里叶变换红外光谱仪对其表征。将AHBP作为TMP稀释剂,研究了AHBP加入量对TMP/甲基纳迪克酸酐(MNA)体系性能的影响,并与传统稀释剂1,4-丁二醇二缩水甘油醚(BDDGE)进行比较。采用热重分析仪及电子万能试验机对其性能测试。当AHBP含量为15%时,体系黏度为2800 m Pa·s左右,拉伸强度、弯曲强度、冲击强度分别提高了12%,13.2%,40%,起到了增韧效果,热失重5%时温度为313.9℃;而BDDGE/TMP/MNA体系的力学性能及热性能下降显著。结果表明相对于BDDGE,AHBP在不降低TMP力学性能的情况下能较好地降低TMP黏度。
文摘This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).
文摘This paper describes an effective method for determining chlordiazepoxide. An excess of sodium tetraphenylboron is added to precipitate chlordiazepoxide in HAc NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate is titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied for the determination of chlordiazepoxide raw materials with satisfactory results. The recovery is between 99.58% and 100.4%, the relative error is less than ± 0.50% . Experiments show that the method gives the same results as the approach using nonaqueous titration (ChP).
