从竹材加工剩余物竹屑中提取纤维素,然后制备羧甲基纤维素钠。采用PlACkETT-burMAn(Pb)设计与中心组合法对影响竹纤维羧甲基纤维素钠取代度的6个相关因素进行了研究,结果表明,关键因子为氢氧化钠与纤维素的质量比、氯乙酸钠与纤维素的质量比和醚化时间;建立此三因素对羧甲基纤维素钠取代度影响的二次回归模型,优化得到最佳制备条件是:氢氧化钠与纤维素的质量比为0.8、氯乙酸钠与纤维素的质量比为1.2,醚化时间为2 H。制得羧甲基纤维素钠的黏度为136 M PA·S,取代度为0.93。利用扫描电镜、红外光谱、X射线衍射和热重分析等对制得样品进行表征。结果表明,利用廉价的竹屑可以制备高取代度的羧甲基纤维素钠。The preparation of carboxymethyl cellulose( CMC) with a high degree of substitution( DS) using cellulose from bamboo residues is investigated.The factors affecting DS of CMC are optimized by Plackett-Burman Design( PB) and Central Composite Design.The results of PB indicate that the mass ratio of Na OH and cellulose,the mass ratio of Cl CH2 COONa and cellulose,and the etherification time are the key factors.The quadratic regression model of these three factors is established.The optimal conditions are shown as follows: 0.8 of the mass ratio of Na OH and cellulose,1.2of the mass ratio of Cl CH2 COONa and cellulose,2 hours of the etherification time.Under this condition,CMC with a DS of 0.94 and viscosity of 136 m Pa·s is obtained.The CMC is characterized by SEM,FT-IR,XRD,and TGA.It indicates that cheap bamboo shavings could be used to prepare CMC with a high DS.国家自然科学基金(21303142;31170067); 福建省中青年教师教育科研项目(JA14010); 厦门市海洋经济发展专项资金项目(14GZP59HJ29
