相分离条件下楠竹碱木素改性产物的集聚态研究  

Research on Aggregation of Phyllostachys Pubescens Alkaline Lignin using Phase Separation Condition

作　　者：戴歆[1] 任浩[1] 翟华敏[1] 刘祝兰[1] 曹云峰[1] 

机构地区：[1]南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京210037

出　　处：《纤维素科学与技术》2014年第2期14-21,共8页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金青年基金(51203075);江苏省自然科学基金青年基金(BK2012420);国家重点基础研究发展计划(2010CB732205)

摘　　要：楠竹经三种条件碱法蒸煮,所得黑液经酸化沉淀干燥,用60%(wt)硫酸、相分离法处理,精制有机相得到三种碱木质素酚,将三种碱木质素酚分别与由竹粉经相分离法直接提取的木质素酚通过红外光谱(FT-IR)、凝胶色谱(GPC)、原子力显微镜(AFM)、动态光散射(DLS)进行结构和分子集聚态的分析与比较。结果表明,在缓和的碱法蒸煮条件下,黑液中的木素还具备一定的酚化改性潜力,所得碱木素酚结构和官能团与竹粉木质素酚未见较大差异,但在分子集聚态上其分散性明显不同于竹粉木质素酚,表现为尺度小,分布密集等特点。Native lignins were separated from bamboo （Phyllostachys Pubescens） using phase separation system. Three kinds of alkaline lignins were isolated from cooking black liquor. And the three kinds of alkaline lignins were modified using phase separation system. The characteristics of bamboo native lignin and alkaline lignins were compared using fourier transform infrared spectroscopy （FT-IR）, gel permeation chromatography （GPC）,atomic force microscopy （AFM） and dynamic light scattering （DLS）. The solubility of lignophenols derived from bamboo and from alkaline lignins were better than that of alkaline lignins. All materials were soluble in common organic solvents and showed similar functional groups in FT-IR spectra. GPC data indicated that the molecular weight of bamboo lignophenols （circa 2200~3000） were larger than that of alkaline lignophenols （circa 1700~ 2800）. AFM images taken from the same smooth plane showed that the molecular heights of bamboo lignophenols were higher than those of alkaline lignophenols, and the aggregation of bamboo lignophenols appeared to be very uniform. DLS results indicated that the average dimension of lignophenol molecular and its aggregates ranged from 170 nm to 2220 nm, depending on pH, concentration of solution and the type of material examined.

关 键 词：楠竹 碱木素 木质素酚 结构和集聚态 

分 类 号：TQ351[化学工程] TS749.7[轻工技术与工程—制浆造纸工程]