聚马来酸/LDH插层型纳米复合材料的制备与表征

Preparation and Characterization of PMA/LDH Intercalated Nano-Composite

采用离子交换法将马来酸单体插入Mg/Al-Cl-LDH层间,然后通过热或氧化还原引发层间单体链式原位缩聚制备聚马来酸/水滑石(LDH)插层型纳米复合材料。研究了插层组装的条件和引发聚合的方法。采用X射线衍射(XRD)、红外光谱(FT-IR)、热重及差热分析(TG-DTA)和扫描电子显微镜(SEM)等手段对样品进行了表征与测试。结果表明,马来酸插层LDH使层间距由0.767 nm增大至1.19 nm,H2O2引发剂或热引发聚合使层间距由1.19 nm分别减小至1.114 nm和1.085 nm,产物粒径为50 nm^100 nm。聚马来酸分子进入LDH层间形成超分子结构,使其热稳定性提高100℃以上。

Poly（maleic acid）/layered double hydroxides（PMA/LDH） intercalated nanocomposites were prepared by in situ suspension polymerization of maleic acid（MA） pillared LDH initiated by thermal or oxidation/reduction oxidation.MA/LDH was assembled by ion-exchange method.Intercalation assembly conditions and polymerization methods were researched in detail.The as-prepared samples were characterized by X-ray diffraction（XRD）,Fourier transform infrared spectrum（FT-IR）,thermogravimetric-differential thermal analysis（TG-DTA） and scanning electron microscope（SEM） measurements.The results show that the interlayer distance increases from 0.767 nm for Cl-LDH to 1.19 nm for MA pillared LDH and further decreases from 1.19 nm to 1.085 nm or 1.114 nm after polymerization of MA initiated by thermal or oxidation/reduction treatment.It is found that the particle size of products is about 50 nm～100 nm.The thermal stability of PMA/LDH is 100 ℃ higher than that of pure PMA.