The waterborne particles of bisphenol A epoxy resin were prepared by the phaseinversion technique, and the effects of the concentration of the synthetic polymeric emulslfleron the particles size and structure were dis...The waterborne particles of bisphenol A epoxy resin were prepared by the phaseinversion technique, and the effects of the concentration of the synthetic polymeric emulslfleron the particles size and structure were discussed. At lower concentration of the emulsifier,the bigger molecular sieves alike particles were obtained, on the contrary, the smallerparticles with some aggregation were prepared at higher concentration of the emulslfler. Theformation mechanism of different particle sizes and structure at different concentrations of theemulsifier was proposed. presides, the probable model of the aggregation was also brieflypresented.展开更多
采用离子液体作为反应介质,在235-280℃,反应3-7 h,研究了双酚A缩水甘油醚/乙二胺（DGEBA/EDA）环氧树脂的降解反应并考察了温度、时间等因素对降解的影响。通过傅里叶变换红外光谱仪对降解的残余固体进行分析,使用高效液相色谱（HPLC...采用离子液体作为反应介质,在235-280℃,反应3-7 h,研究了双酚A缩水甘油醚/乙二胺（DGEBA/EDA）环氧树脂的降解反应并考察了温度、时间等因素对降解的影响。通过傅里叶变换红外光谱仪对降解的残余固体进行分析,使用高效液相色谱（HPLC）法对液相产物进行定性定量研究。明确了反应后的残余固体为未降解的环氧树脂固体。获得的主要产物为苯酚、双酚A、对异丙基苯酚等。时间越长、温度越高降解率越大,主要产物收率越高,280℃,3 h时,降解率达到92%。通过Arrhenius方程进行动力学研究,计算反应的活化能,求得在Emim BF4介质中,反应活化能为Ea=156.4 k J·mol^-1,而在Bmim BF4介质中,反应活化能为Ea=109.4 k J·mol^-1。得到降解反应速率方程分别为-d[ER]/dt=8.813×10^12exp（-1.564×10^5/RT）[ER]和-d[ER]/dt=4.666×10^8exp（-1.094×10^5/RT）[ER]。展开更多
文摘The waterborne particles of bisphenol A epoxy resin were prepared by the phaseinversion technique, and the effects of the concentration of the synthetic polymeric emulslfleron the particles size and structure were discussed. At lower concentration of the emulsifier,the bigger molecular sieves alike particles were obtained, on the contrary, the smallerparticles with some aggregation were prepared at higher concentration of the emulslfler. Theformation mechanism of different particle sizes and structure at different concentrations of theemulsifier was proposed. presides, the probable model of the aggregation was also brieflypresented.
文摘采用离子液体作为反应介质,在235-280℃,反应3-7 h,研究了双酚A缩水甘油醚/乙二胺（DGEBA/EDA）环氧树脂的降解反应并考察了温度、时间等因素对降解的影响。通过傅里叶变换红外光谱仪对降解的残余固体进行分析,使用高效液相色谱（HPLC）法对液相产物进行定性定量研究。明确了反应后的残余固体为未降解的环氧树脂固体。获得的主要产物为苯酚、双酚A、对异丙基苯酚等。时间越长、温度越高降解率越大,主要产物收率越高,280℃,3 h时,降解率达到92%。通过Arrhenius方程进行动力学研究,计算反应的活化能,求得在Emim BF4介质中,反应活化能为Ea=156.4 k J·mol^-1,而在Bmim BF4介质中,反应活化能为Ea=109.4 k J·mol^-1。得到降解反应速率方程分别为-d[ER]/dt=8.813×10^12exp（-1.564×10^5/RT）[ER]和-d[ER]/dt=4.666×10^8exp（-1.094×10^5/RT）[ER]。
