双分布聚乙二醇接枝纳米二氧化硅的高效可控制备

发布时间：2018-01-20 23:43

本文关键词： St?ber法二氧化硅聚乙二醇混合溶剂双分布接枝刷　出处：《高分子学报》2017年11期 　论文类型：期刊论文

【摘要】：在混合溶剂中通过"grafting to"的方法将2种分子量不同的聚乙二醇单甲醚(MPEG M_w=750,4000)接枝到氨基修饰的St?ber法二氧化硅(SiO_2-NH_2)表面,制备双分布纳米接枝复合物.采用二步法,先将带环氧端基的低分子量聚乙二醇单甲醚(MPEG-EO)与SiO_2-NH_2在甲苯溶剂中充分反应后,与高分子量的MPEG-EO在甲苯和正癸烷的混合溶剂中使用相同的反应条件和后处理方法,能便捷制备出具有双分布接枝的纳米复合物.在接枝反应体系中,分子链的链段尺寸和接枝密度之间存在着密切关系.一定的范围内,接枝密度随链段尺寸减小而增大.通过改变混合溶剂比例来调控接枝链段的尺寸,可以很好控制聚合物的接枝密度.在双分布接枝的纳米复合物中,低分子量的接枝密度为0.85 chains/nm~2,高分子量的接枝密度能达到0.40 chains/nm~2,体现出了简单、高效、可控的特点,与聚环氧乙烷(PEO)共混后分散良好,对于制备出均匀分散的纳米复合材料起到了一定的指导作用.
[Abstract]:Two kinds of polyethylene glycol monomethyl ether with different molecular weight were grafted to amino modified Sturon by "grafting to" method in mixed solvent. The double distributed nano-grafted composites were prepared on the surface of SiO2 / SiO2-NH2) by ber method. The two-step method was used. First, the low molecular weight polyethylene glycol monomethyl ether (MPEG-EO) with epoxy end group was fully reacted with SiO_2-NH_2 in toluene solvent. The same reaction conditions and post-treatment methods were used in the mixed solvent of toluene and n-decane with high molecular weight MPEG-EO. In the graft reaction system, there is a close relationship between the chain size and the graft density. The graft density increases with the decrease of segment size. The graft density can be well controlled by adjusting the size of the graft segment by changing the proportion of the mixed solvent. The grafting density of low molecular weight is 0.85 chains / nmm-2, and that of high molecular weight can reach 0.40 chains / nmm-2, which is simple and efficient. The controllable properties show that the blends with PEO / PEO have good dispersion and play a guiding role in the preparation of uniformly dispersed nanocomposites.
【作者单位】：江苏省先进高分子材料设计及应用重点实验室苏州大学材料化学与化工学部;中国科学院化学研究所工程塑料院重点实验室北京分子科学国家实验室;
【基金】：国家自然科学基金(基金号21574141)资助项目
【分类号】：O632.3;TB383.1
【正文快照】： **通讯联系人,E-mail:ylsu@iccas.ac.cn;ylcai@suda.edu.cn纳米二氧化硅(Si O2)因易于实现功能化改性而被广泛应用于纳米复合材料的制备[1].在近几十年的研究中,人们一直关注于将聚合物通过化学键接枝到Si O2表面的纳米复合材料制备.接枝到Si O2表面的接枝聚合物层甚至决定了

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