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超声活化后的竹粉在微波辐射的作用下与丙烯腈反应制备氰乙基化竹粉,考察最佳用量和反应条件对氰乙基化反应的影响,并用电子显微镜、X-射线衍射分析(XRD)、红外(FTIR)和示差扫描量热分析(DSC)等对竹粉改性前后的微观结构和热塑性进行了初步研究.结果表明,1.5g竹粉在饱和KSCN的NaOH溶液的润胀作用下,超声活化10min后,与8mL丙烯腈微波辐射30min即可获得传统40℃水浴反应3h才能得到的增重率约为40%的氰乙基化竹粉.微波作用使竹粉的氰乙基化反应可以在非常温和的条件下(40℃)短时间内完成,减少了丙烯腈的水解和均聚等副反应.氰乙基化竹粉中竹纤维表面结构变得粗糙,管束结构消失,结晶度降低,并在145～290℃之间出现一个大的吸热峰.
Ultrasonic activated bamboo powder reacted with acrylonitrile under the action of microwave radiation to prepare cyanoethylated bamboo powder. The effects of the optimal dosage and reaction conditions on the cyanoethylation reaction were investigated. The effects of reaction conditions on the cyanoethylation were investigated by electron microscope, X-ray diffraction analysis XRD, FTIR and DSC were used to study the microstructure and thermoplastic properties of bamboo powder before and after modification.The results showed that the swelling effect of 1.5g bamboo powder in NaOH solution with saturated KSCN , Ultrasonic activated 10min, and 8mL acrylonitrile microwave irradiation 30min to obtain the traditional 40 ℃ water bath reaction 3h to get the weight gain rate of about 40% of cyanoethylated bamboo powder. Microwave reaction of bamboo powder cyanoethyl The reaction can be completed in a very short time under very mild conditions (40 ℃), reducing the side reactions such as hydrolysis and homopolymerization of acrylonitrile.The surface structure of bamboo fiber in cyanoethylated bamboo powder becomes rough and the structure of tube bundle disappears, The degree of crystallinity decreases, and a large endothermic peak appears between 145 and 290 ° C.