| 摘 要： | 1 Results Nanocomposite has attracted more and more interest all over the world.Polystyrene (PS) is a commercialized and mass-productive polymer,continuous research efforts have been devoted to the development of polystyrene/montmorillonite (PS/MMT) nanocomposites[1-2].But the polarity of styrene (St) is too small to intercalate the space between the clay layers.The polarity of hydrophilic monomer is so strong that it can intercalate the MMT easily,the intercalated smectic clays maybe exfoliated by using a polymer to form nanocomposites.In this work,organic modified montmorillonite (OMMT) was made by pristine montmorillonite and cetyl trimethylammonium brimide.The two kind of nanocomposite,polystyrene-acrylate/Na-MMT (PSA/MMT) and PSA/OMMT were prepared from styrene,hydrophilic acrylate monomer and MMT or OMMT by in site emulsion polymerization,respectively.Hydrophilic acrylate monomer [beta-hydroxyethyl methacrylate (HEMA),acrylic acid(AA),methyl acrylate(MA)] type,level and emulsifier type on the thermal stability of two nanocomposites were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG),the structure of composites was characterized by Infrared spectroscopy (IR) analysis and X-ray diffraction (XRD).The results showed that the thermal stability of the two composites were enhanced by the addition of HEMA,AA or MAA,and PSA/OMMT nanocomposite had higher thermal stability than that PSA/MMT nanocomposite,and also HEMA had better improvement for both nanocomposites than MAA and AA.In addition,the thermal stability of the nanocomposite made by emulsifier SDS was better than that by emulsifier SDBS.Acknowledgement:Thanks to the financial support of key laboratory of new material and processing technology of Guangxi province(063006-5C-06).
|
