Synthesis and Characterization of PE-g-MA/MgAl-LDH Exfoliation Nanocomposite via Solution Intercalation  

作　　者：陈伟 瞿保钧 

机构地区：[1]State Key Laboratory of Fire Science and Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei

出　　处：《Chinese Journal of Chemistry》2003年第8期998-1000,共3页中国化学（英文版）

基　　金：theNationalKeyBasicSpecialFoundation (No .2 0 0 1CB40 960 0 )ofChina

摘　　要：An organo modified MgAl layered double hydroxide (OMgAl LDH) was successfully exfoliated in the xylene solution of polyethylene grafted maleic anhydride (PE g MA) under refluxing condition. A PE g MA/MgAl LDH exfoliation nano composite was formed after the precipitation of PE g MA from the dispersion system. The structure and thermal property of the PE g MA/MgAl LDH exfoliation nanocomposite were characterized by X ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetry analysis (TGA). The disappearance of d 001 XRD peak of OMgAl LDH at 2 θ =3 2° suggests that the MgAl hydroxide sheets are exfoliated in the nanocomposite. The TEM image shows that the MgAl hydroxide sheets of less than 70 nm in length or width are exfoliated and dispersed disorderly in PE g MA matrix. TGA profiles indicate that the PE g MA/MgAl LDH nanocomposite with 5 wt% OMgAl LDH loading shows a faster charring process in temperature range from 210 to 390 ℃ and a greater thermal stability beyond 390 ℃ than PE g MA does. The decomposition temperature of the nanocomposite is 25 ℃ higher than that of PE g MA as measured at 50% weight loss. The PE g MA/MgAl LDH nanocomposite is promising for application of flame retardant polymeric materials.An organo modified MgAl layered double hydroxide (OMgAl LDH) was successfully exfoliated in the xylene solution of polyethylene grafted maleic anhydride (PE g MA) under refluxing condition. A PE g MA/MgAl LDH exfoliation nano composite was formed after the precipitation of PE g MA from the dispersion system. The structure and thermal property of the PE g MA/MgAl LDH exfoliation nanocomposite were characterized by X ray diffraction (XRD), transmission electron microscopy (TEM), and thermogravimetry analysis (TGA). The disappearance of d 001 XRD peak of OMgAl LDH at 2 θ =3 2° suggests that the MgAl hydroxide sheets are exfoliated in the nanocomposite. The TEM image shows that the MgAl hydroxide sheets of less than 70 nm in length or width are exfoliated and dispersed disorderly in PE g MA matrix. TGA profiles indicate that the PE g MA/MgAl LDH nanocomposite with 5 wt% OMgAl LDH loading shows a faster charring process in temperature range from 210 to 390 ℃ and a greater thermal stability beyond 390 ℃ than PE g MA does. The decomposition temperature of the nanocomposite is 25 ℃ higher than that of PE g MA as measured at 50% weight loss. The PE g MA/MgAl LDH nanocomposite is promising for application of flame retardant polymeric materials.

关 键 词：polymer/layered double hydroxide nanocomposites EXFOLIATION thermal stability 

分 类 号：O621[理学—有机化学]