机构地区: 华南理工大学轻工与食品学院制浆造纸工程国家重点实验室
出 处: 《造纸科学与技术》 2005年第6期49-53,共5页
摘 要: 纤维素是具有多孔性结构及一定孔径分布的天然高分子材料,其中大部分微孔孔径在纳米数量级。这种特殊的结构使其在原位复合法制备磁性纳米复合材料研究中有无比的优越性和可操作性。本文采用N2吸附法、染料吸附法、保水值测定等手段表征不同原料来源的纤维素纤维的多孔性,并对丝光化和超声波预处理后纤维素纤维的比表面积、孔隙率、孔径和对液体的吸附性能的变化进行了研究。研究表明不同原料的比表面积、孔径尺寸和羧基含量均不相同,云杉纤维羧基含量较高,孔径较小,表面积较大,可作为制备磁性纳米复合纤维素纤维及磁性纸的原料。丝光化和超声波处理能进一步提高纤维素纤维的保水值和可及表面积。 The porous properties,the accessibility of cellulose fibers were characterized by determination of WRV, surface area by means of centrifugation, N2 adsorption and dye adsorption methods. The changes of spruce cellulose fibers'accessibility pretreated by ultrasonic wave and alkali were also investigated. Due to smaller average diameter of the pores, higher WRV, and more carboxyl groups compared with other cellulose raw materials, spruce cellulose fibers are the ideal raw materials for the preparation of magnetic cellulose nanocomposites and magnetic paper.