落叶松和毛白杨制备纳米结晶纤维素的性能对比  

Comparative Studies on Properties of Nano Crystalline Cellulose Prepared from Larch and Populus Tomentosa

作　　者：林舒媛[1] 李昱[1] 朱月梅[1] 张浩[1] 佘颖[1] 蒲俊文[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《生物质化学工程》2013年第3期29-33,共5页Biomass Chemical Engineering

基　　金：国家级大学生创新创业训练计划(201210022036);北京市自然科学基金(BLYJ201106)

摘　　要：本研究以落叶松和毛白杨浆粕为原料,用酸水解法、超声处理分别制备纳米结晶纤维素,并研究原料的α-纤维素含量和聚合度等性质对制备所得纳米结晶纤维素得率、结构、结晶度和热稳定性的影响。实验所选用落叶松浆粕的α-纤维素质量分数为88.93%,平均聚合度达到1048.11,而毛白杨浆粕的α-纤维素质量分数为85.90%,平均聚合度为976.07。结果表明:酸水解处理对浆粕纤维中排列致密的结晶区影响不明显,但是会破坏非结晶区造成结晶度提高,而超声处理会使结晶度下降;由落叶松浆粕制备所得纳米结晶纤维素的得率高、晶面特征吸收峰显著,且热稳定性较好(热降解温度为295.2℃),而由毛白杨浆粕制备所得的纳米结晶纤维素的热降解温度为283.1℃。Nano crystalline cellulose （NCC） was prepared from larch and Populus tomentosa pulp by acid hydrolysis method and ultrasound treatment in this study. The effects of α-cellulose and degree of polymerization on the yield, structure, crystallinity, and thermal stability of NCC were studied. The mass fraction of α-cellulose in larch pulp was 88.93% and the average degree of polymerization was 1048. 11, while the mass fraction of α-cellulose and degree of polymerization of P. tomentosa pulp were 85.90 % and 976. 07, respectively. The results showed that the acid hydrolysis affected the crystal region of cellulose inconspicuously and the amorphous region was destroyed by sulfuric acid. Crystallinity of NCC was decreased by the sonication. NCC prepared from larch precented high yield and obvious characteristic absorption peaks of the crystal region. Its thermal degradation temperature was 295.2 ℃, while that of NCC prepared from P. tomentosa was 283.1 ℃.

关 键 词：纳米结晶纤维素 落叶松 毛白杨 性能 

分 类 号：TQ352.1[化学工程] TB383.1[一般工业技术—材料科学与工程]