以纤维素为模板制备多孔SiO_2棒  

Synthesis of Mesoporous Silica Nanorod By Using the Cellulose as Template

作　　者：张奎[1] 刘春华[1] 王平华[1] 范保林[1] 屈龙[1] 

机构地区：[1]合肥工业大学化工学院,安徽合肥230009

出　　处：《高分子材料科学与工程》2011年第2期145-148,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50573016);合肥工业大学青年基金资助项目(060608F)

摘　　要：以2-溴丁酰溴与羟乙基纤维素的酯化产物为原子转移自由基(ATRP)聚合的大分子引发剂,在60℃引发甲基丙烯酸-N,N-二甲氨基乙酯(DMAEMA)聚合,再将PDMAEMA接枝到纤维素上。以此作为模板,在其水溶液中搅拌加入前驱体正硅酸乙酯(TEOS),水解产生二氧化硅凝胶并吸附在模板上,形成二氧化硅棒,通过红外光谱(FT-IR),热重分析(TGA)和透射电镜(TEM)对产物的结构、组成进行了表征。研究了pH值、TEOS用量、水解时间对二氧化硅棒形态的影响。实验结果表明,在pH=4,TEOS浓度为10mg/mL时,水解24 h^36 h,可以获得较好的棒状结构。Cellulose was acylated with 2-bromobutyrylbromide at ambient temperature in ionic liquid（RTIL）,1-allyl-3-methylimidazolium chloride,giving polyfunctional macroinitiators for atom transfer radical polymerization（ATRP）.Copolymers were obtained via ATRP of N,N-dimethylamino-2-ethyl methacrylate（DMAEMA） with CuBr/ pentamethyldiethylenetriamine（PMDETA） as catalyst and N,N-dimethylformamide（DMF） as solvent at 60 ℃.The resultant Cellulose-graft-poly（N,N-dimethylamino-2-ethyl methacrylate）（cellulose-g-PDMAEMA） was dissolved in distilled water under stirring.Mesoporous silica nanotubes were synthesized under mild conditions by applying conventional sol–gel routes using tetraethyl orthosilicate（TEOS） as the precursors.The results were confirmed via FT-IR,TGA and TEM.The effect of the pH value,the concentration of TEOS and polycondensation time on the morpHology of silicarod was studied.The results show that the desirable morpHology of silicarod can be obtained from polycondensation of TEOS in aqueous solution with concentration of 10 mg/mL at pH=4 for 24 h～36 h.

关 键 词：原子转移自由基聚合 甲基丙烯酸-N N-二甲氨基乙酯 羟乙基纤维素 二氧化硅棒 

分 类 号：TB383[一般工业技术—材料科学与工程]