杨木粉塑化工艺及塑化产物理化性能  

Poplar powder plasticization process and physical and chemical properties of plasticized product

作　　者：吕九芳[1] 鹿甫坤 刘欢欢[1] 孙丰文[1,2] 

机构地区：[1]南京林业大学,南京210037 [2]南京林业大学(泗阳)杨木加工利用技术研究院

出　　处：《林业科技开发》2015年第5期102-106,共5页China Forestry Science and Technology

基　　金：江苏省产学研联合创新基金项目(BY2011013);苏北科技发展计划项目(BC20114761)

摘　　要：以Na OH溶液为润胀剂及催化剂,氯化苄为醚化剂对杨木粉进行塑化改性。以塑化产物的熔体质量流动速率和玻璃化转变温度作为主要评价指标,研究了碱液质量分数、塑化时间、杨木粉与氯化苄的质量比以及超声波处理对塑化效果的影响,同时采用差示扫描量热仪、傅立叶红外光谱、扫描电子显微镜等对杨木粉及塑化产物的玻璃化转变温度、分子结构、微纤丝形态进行研究。结果表明:选择质量分数为15%的碱液在超声波条件下预处理20 min,氯化苄与杨木粉的质量比为2.0,苯甲基化反应时间为1 h的工艺条件最佳。塑化杨木粉的分子结构变化明显,微纤丝状结构消失较多,胞壁内层呈无规则非结晶结构。超声波处理对杨木粉的塑化更加有利。Plasticization of poplar powder was carried out with NaOH solution as swelling agent and catalyst, and benzyl chloride as etherification agent. By taking the melt mass flow rate and glass transition temperature as the main evaluation in- dices, this paper analyzed the influence of alkali mass fraction, plasticizing time, mass ratio of poplar powder to benzyl chloride and ultrasonic treatment on plasticizing effect. The glass transition temperature, molecular structure and micro morphology of poplar power and modified product were studied and characterized by differential scanning calorimeter （DSC）, fourier transform infrared spectroscopy （FT-IR） and scanning electron microscopy （SEM）. The results showed that the optimum conditions of plasticization were as follows： alkali mass fraction 15%, pretreatment time of ultrasonic 20 min, mass ratio of benzyl chloride to poplar powder 2.0, benzylation time 1 h. The molecular structure of the modified pop- lar power varied significantly, most microfibril structure disappeared and amorphous structure appeared on the inner layer of cell wall. Ultrasonic treatment was favorable to the plasticization of poplar powder.

关 键 词：杨木粉 氯化苄 熔体质量流动速率 塑化 超声波处理 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]