聚萘并噁嗪/蒙脱土纳米复合材料的制备与表征

用原位插层反应法地制备了聚萘并嗪 蒙脱土纳米复合材料 .采用X ray衍射 (XRD)及透射电镜(TEM)研究复合材料中蒙脱土硅酸盐片层间距 ,发现硅酸盐片层间距由 1 2 6nm扩增至 5 88nm以上 .同时研究了该复合材料的耐热性 ,并探讨了复合材料的结晶行为

POLYNAPHTHOXAZINE-MONTMORILLONITE NANOCOMPOSITES:SYNTHESIS AND CHARACTERIZATION

A new class of phenolic like thermosetting resins based on the ring opening polymerization of naphthoxazine precursor exhibits some unique properties, including:no by product releasing during curing reactions; near zero shrinkage and excellent mechanical properties. Polynaphthoxazines clay hybrid nanocomposites were prepared from 1,5 dihydroxynaphthalene,aniline, formaldehyde and different proportion montmorillonite(MMT) by in situ reaction in ethanol. 1H Nuclear Magnetic Resonance( 1H\|NMR)、X ray Diffraction Analysis (XRD)、Thermogravimetry(TGA) and Transmission Electron Microscopy(TEM) were applied to characterize the nanocomposites. 1H\|NMR spectrum of naphthoxazine from the nanocomposites was identical to that of the pristine naphthoxazine, indicating the presence of MMT didn't change the chemical structure of the product. The spaces of silicate layers of montmorillonite in the composites were investigated by using X ray diffractometer. It was found that exfoliation structure was formed after in situ synthesis reaction and was remained after being cured. The TEM results suggested that an exfoliated polynaphthoxazine montmorillonite nanocomposite was successfully achieved. Dynamic TGA showed that only very small amount of clay is effective to improve the weight residues for nanocomposites. The char yield at 700℃ increased by ca.10% with 5 wt% MMT content in the nanocomposite and reached 65%. The confined crystallization behavior of the system was discussed.