郑州大学学报（工学版）
鄭州大學學報（工學版）
정주대학학보（공학판）
JOURNAL OF ZHENGZHOU UNIVERSITY(ENGINEERING SCIENCE)
2010年
2期
83-86
,共4页
乙二胺%硅胶%接枝%动力学
乙二胺%硅膠%接枝%動力學
을이알%규효%접지%동역학
ethylenediamine%silica gel%graft%kinetics
以氯丙基三氯硅烷为架桥剂,乙二胺为硅胶表面修饰剂,合成了乙二胺接枝硅胶材料.考察了反应温度、反应时间和乙二胺含量等因素对取代反应的影响,得到优化的反应条件为:反应温度333 K,反应时间16 h,乙二胺与CPTCS-SiO_2表面氯含量的摩尔比大于9.测定了乙二胺取代反应的动力学数据,采用微分法和最小方差线性回归法处理实验数据,获得了表现动力学模型的反应级数为4.37,活化能为55.44 kJ/mol,频率因子为5.06×10~7h~(-1),并用红外谱法和性能测定验证了乙二胺在硅胶表面进行的接枝反应.
以氯丙基三氯硅烷為架橋劑,乙二胺為硅膠錶麵脩飾劑,閤成瞭乙二胺接枝硅膠材料.攷察瞭反應溫度、反應時間和乙二胺含量等因素對取代反應的影響,得到優化的反應條件為:反應溫度333 K,反應時間16 h,乙二胺與CPTCS-SiO_2錶麵氯含量的摩爾比大于9.測定瞭乙二胺取代反應的動力學數據,採用微分法和最小方差線性迴歸法處理實驗數據,穫得瞭錶現動力學模型的反應級數為4.37,活化能為55.44 kJ/mol,頻率因子為5.06×10~7h~(-1),併用紅外譜法和性能測定驗證瞭乙二胺在硅膠錶麵進行的接枝反應.
이록병기삼록규완위가교제,을이알위규효표면수식제,합성료을이알접지규효재료.고찰료반응온도、반응시간화을이알함량등인소대취대반응적영향,득도우화적반응조건위:반응온도333 K,반응시간16 h,을이알여CPTCS-SiO_2표면록함량적마이비대우9.측정료을이알취대반응적동역학수거,채용미분법화최소방차선성회귀법처리실험수거,획득료표현동역학모형적반응급수위4.37,활화능위55.44 kJ/mol,빈솔인자위5.06×10~7h~(-1),병용홍외보법화성능측정험증료을이알재규효표면진행적접지반응.
The ethylenediamine-grafted silica gel(EDA/SiO_2)was prepared by CPTCS as surface anchor and ethylenediamine as surface modification agent.The effects of temperature,time and ethylenediamine concentration on the substitution reaction of ethylenediamine with CPTCS-SiO_2 were investigated in detail.And it was obtained that the optimal conditions were reaction temperature 333 K,reaction time 16h,and n(ethylenediamine):n(chlorine on the surface of CPTCS-SiO_2)more than 9.The substitution reaction kinetics of ethylenediamine with CPTCS-SiO_2 was also investigated. It was obtained that the parameters of the apparent kinetic model were reaction order 4.37.activation energy 55.44KJ/mol and frequency factor 5.06×10~7h~(-1) by the kinetics data fitted with the differentiation and minimum variance linear regression.Infrared spectroscopy and its performance show that ethylenediamine was grafted on silica gel by substitution reaction.
