菠萝叶纤维与甲基丙烯酸甲酯接枝聚合条件优化及其共聚物性能表征  

Optimization of Graft Polymerization Conditions of Methyl Methacrylate onto Pineapple Leaf Fibers and Characterization of Copolymers

作　　者：熊曾恒 林艳 林昭华[1,2] 何忠平 张玉苍[1,2] 

机构地区：[1]海南大学材料与化工学院,海南海口570228 [2]热带岛屿资源先进材料教育部重点实验室(海南大学),海南海口570228

出　　处：《生物质化学工程》2017年第6期11-18,共8页Biomass Chemical Engineering

基　　金：国家自然科学基金资助项目(51263006);海南省国际合作项目(KJHZ2014-02);海南省重点研发项目(ZDYF2017005)

摘　　要：研究了硝酸铈铵为引发剂的氧化还原体系中,甲基丙烯酸甲酯(MMA)与菠萝叶纤维以水为介质的非均相接枝聚合反应。以纤维接枝率作为聚合效果评价指标,确定了优化的反应条件:铈离子浓度0.006 mol/L,氢离子浓度0.06 mol/L,MMA浓度0.4 mol/L,反应温度50℃,反应时间3 h,接枝率达到185%。用扫描电镜(SEM)、X射线衍射(XRD)、红外光谱(FT-IR)、热重分析(TG)、纤维强力仪等分析MMA接枝前后纤维的结构和理化性质,结果显示,菠萝叶纤维接枝MMA后,改变了纤维分子原有的规整排列,纤维部分结晶区受到破坏,纤维呈松散状且更柔软,抗拉性能下降,而耐热性有所增强。同时,研究结果也显示了菠萝叶纤维MMA接枝率越高,则纤维的吸湿率越低,耐酸碱性能越强。Graft polymerizations of methyl methacrylate（ MMA） onto pineapple leaf fibers by using ammonium cerium nitrate as initiator and water as medium were carried out in heterogeneous systems. The obtained optimal process conditions for the graft polymerization were ammonium cerium nitrate concentration of 0. 006 mol/L,hydrogen ion of 0. 06 mol/L,MMA of 0. 4 mol/L and reaction for 3 h at 50 ℃. Under these conditions, the grafting rate of copolymer was 185%. The structures and physicochemical properties of pineapple leaf fibers before and after graft polymerization were characterized by SEM,FT-IR,TG and fiber strength analyzer,respectively. The results indicated that the graft polymerization changed the original arrangement of fibrous molecules,destroyed parts of crystalline areas of fibers,and decreased the tensile strength; and the grafted pineapple leaf fibers were loose and more soft,whereas the heat resistance improved. Meanwhile,the higher grafting ratio of pineapple leaf fibers was,the lower hygroscopicity as well as higher acid and alkali resistance it was.

关 键 词：菠萝叶纤维 甲基丙烯酸甲酯 接枝聚合 接枝率 

分 类 号：O631[理学—高分子化学]