原位聚合法制备聚丙烯酸甲酯/ZnAl层状双氢氧化物插层纳米复合材料及其形貌特征

近 2 0年来 ,聚合物 /层状无机物纳米复合材料引起了广泛关注 ,与聚合物材料相比 ,该类纳米复合材料在力学、热稳定性、阻燃、气体阻隔等性能方面都有显著增强 .但所报道的绝大部分无机物均采用蒙脱土为代表的层状硅酸盐1～ 3] ,而以层状双氢氧化物 (Layered double hydroxide,LDH)为基础制备的聚合物 /层状无机物纳米复合材料的报道极少 .LDH是由水镁石结构中的二价阳离子 (M2 + )被三价阳离子 (M3+ )取代而形成的 ,层上产生的剩余正电荷被吸附在层间的阴离子平衡 .与层状硅酸盐相比 ,L DH层间电荷密度高 ,层与层之间相互作用强 ,导…

Synthesis of PMA/ZnAl-LDH Intercalation Nanocomposite by in situ Polymerization and Its Morphology

A poly(methyl acrylate)(PMA)/ZnAl layered double hydroxide(ZnAl-LDH) intercalation nanocomposite is synthesized by in situ polymerization of methyl acrylate with ogano-modified ZnAl-LDH(O-ZnAl-LDH). Its structure and morphology are confirmed by X-ray diffraction(XRD) and transmission electron microscopy(TEM) image. The d 001 of O-ZnAl-LDH is expanded to 2.85 nm after polymerization from 2.63 nm, which indicates the intercalation of PMA chains into the galleries of O-ZnAl-LDH. The (001) diffraction of PMA/ZnAl-LDH nanocomposite is broad due to the exfoliation of some O-ZnAl-LDH layers. The TEM image shows that the most of the layers of O-ZnAl-LDH are stacked with a distance of about 3 nm while some of them are exfoliated and dispersed disorderly in the PMA matrix.