表面紫外光接枝聚丙烯酸的聚电解质刷型纳米纤维素晶须  

Polyelectrolyte Brush Type Cellulose Nanowhiskers by Surface UV Grafting with Poly(acrylic acid)

作　　者：张素凌[1] 陈卫汕[1] 甘景洪[1] 蒋永坚[1] 林昌鹏[1] 叶代勇[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《精细化工》2014年第9期1120-1125,共6页Fine Chemicals

基　　金：国家大学生创新性实验计划项目(201210561060)~~

摘　　要：为了研究快速地制备改性纳米纤维素的方法,将低相对分子质量（简称分子量,下同）聚丙烯酸（PAA）以紫外光引发聚合的方法接枝到纳米纤维素晶须上,制备出聚电解质刷型纳米纤维素晶须。采用红外光谱、固体核磁、透射电镜、X射线衍射、热重分析等对刷型纳米纤维素晶须进行了表征测试。考察了单体浓度、光引发剂用量、紫外光照射时间等对接枝聚合反应的影响。结果表明,PAA与纳米纤维素晶须的质量比大于1∶1,光引发剂用量为纳米纤维素晶须质量的0.8%～1.0%,反应时间为90 s时,所得接枝产物中羧基含量最高,达到0.012 75 mol/g。紫外光接枝减少了制备改性纳米纤维素的步骤和时间,将扩展纳米纤维素的表面改性方法和用途。In order to develop a fast preparation method of modified nanocellulose,the polyelectrolyte brush type cellulose nanowhiskers（ CNW） were prepared by surface grafting with low-molecular-weight poly（ acrylic acid）（ PAA） using the UV photo-radiation method. The grafted products（ CNW-g-PAA）were characterized by means of FTIR,13 CNMR,TEM,XRD,DSC,etc. The effects of the graft polymerization conditions,such as the monomer content,the photo-initiator amount,the graft time,which influenced the carboxyl content of the grafted products,were investigated in detail. The optimum grafting conditions were that the mass ratio of PAA to CNW was 1∶1,the mass ratio of the photo-initiator to CNW contents ranged from 0. 8% to 1. 0%,and the graft time was 90 seconds. The optimum highest grafting ratio of carboxyl groups was about 0. 012 75 mol /g. This UV-grafting method utilized less chemical reagents,fewer synthesis steps and shorter reaction time. The synthesized CNW-g-PAA would have a lot of applications.

关 键 词：纳米纤维素晶须 聚丙烯酸 紫外光 接枝 聚合 丙烯酸系列化学品 

分 类 号：O636.11[理学—高分子化学]