摘要
以蔗渣木聚糖(BX)为主要原料,过硫酸铵为引发剂,N′,N-亚甲基双丙烯酰胺(MBAM)为交联剂,在水溶液中与丙烯酰胺(AM)、甲基丙烯酸甲酯(MMA)接枝共聚,合成了AM/MMA-BX交联型接枝共聚物。考察了BX与混合单体(AM-MMA)质量比、单体配比、引发剂浓度、反应温度、反应时间、反应体系溶剂用量、交联剂MBAM用量等对单体转化率(C)、接枝率(G)和接枝效率(GE)的影响。实验确定的较佳反应条件为:m(BX)∶m(AM-MMA)=1∶1,单体配比n(AM)∶n(MMA)=2∶1,引发剂浓度0.043mol·L-1,反应温度55℃,反应时间8.0h,m(BX)∶V(溶剂)=3∶25(g/mL),m(BX)∶m(MBAM)=3∶0.07。采用IR,SEM,XRD对蔗渣木聚糖和接枝共聚物的结构进行了表征。IR在1668cm-1、1737cm-1处出现特征峰;SEM显示颗粒表面结构比改性前光滑,没有粗糙和较大的沟壑;XRD说明分子排列的规整性提高,结晶度增加,结晶区域变大。
The cross-linked graft eopolymer of acrylamide/methyl methacrylate onto bagasse xylan（AM/MMA-BX） was synthesized by graft copolymerization of acrylamide（AM）and methyl methacrylate（MMA）onto BX in aqueous solution using BX as the main raw materials, ammonium persulfate（MBAM） as initiator, N＇, N-methylene-bis-acrylamide（MBAM） as cross-linking agent. The influence of following single factor on the monomer conversion（C）and grafting rate（G）and grafting efficiency（GE） were investigated？ BX and mixed monomers（AM-MMA） mass ratio, the monomer ratio, the concentration of initiator, the reaction temperature and time, the amount of solvent of reaction system, the amount of MBAM as cross-linking agent. The optimal conditions from experiments were as follows： m（BX） ： m（AM MMA）- 1 ： 1, monomer ratio was n （AM） ： n（MMA）= 2： 1, the concentration of ammonium persulfate was 0. 043mol · L-1, the reaction temperature was 55℃ ,the reaction time was 8.0h,m（BX）： V（solvent） =3 ： 25（g/mL）,m（BX） ： m（MBAM）=3 ： 0.07. The structures of BX and the graft copolymer were characterized by IR, SEM and XRD techniques. Characteristic peaks appeared in 1668cm-1 , 1737cm-1 in the IR spectrum. SEM showed that the surface textures of the particle was smoother than that before modified,no rough and larger gap. XRD explained that the molecular arrangement has improved regularity,increasing crystallinity and growing crystalline regions by modifying.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第10期199-201,208,共4页
New Chemical Materials
基金
广西矿冶与环境科学实验中心资助项目(KH2013YB013)
桂林市科学研究与技术开发项目(20110105-3)
关键词
蔗渣木聚糖
交联型接枝共聚物
合成
表征
bagasse xylan,cross-linked graft copolymer,synthesis,characterization
