Preparation And Characterization Of Attapulgite, Microencapsulated Red Phosphorus / Of Pa6 Composites

Polymer /inorganic nanocomposites have extracted extensive research interests due to their unique properties. The nanocomposites combine the advantages of inorganic materials (rigidity, high thermal stability and unique optical electronic and magnetic properties) with the advantages of organic polymers (flexibility, dielectric ductility and processability), which is different from the single material and conventional composite materials. Because the dispersibility of nano/micro materials in polymer plays a key role in the properties of composites, the related investigation is necessary.In this thesis, the subject was stressed on surface treatment and application in polymer of nano materials. Polyamide-6 (PA6) as a polymer and several kinds of inorganic materials (e.g attapulgite and red phosphorus) were used to prepare the materials based on organic/inorganic nanocomposites. The works are as follow:1. The effect of modification with cetyltrimethylammonium bromide (CTAB) and sodium laurylsulfonate(SDS) as organic agents were studied. The results revealed that two kinds of surfactants could not be intercalated into ATP and could be absorbed on the surface of ATP. The surface property of modified ATP showed better dispersility in organic medium. For the study of the effect of SDS absorption in different pH values, the results indicated that silicate impurities in ATP products could be removed at pH<7 and the best absorption could be obtained at pH=7.The polyamide-6(PA6)/org-attapulgite (OATP) nanocomposites were prepared by melt extrusion and characterized by scanning electron microscope (SEM), X-ray diffraction, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), tensile test, and so on. The results showed that OATP fibers could remarkably reinforce the thermal and mechanical properties of PA6 resins, hydrogen bonds were formed between PA6 and OATP, but this could not change the crystal form of PA6. In similar with layered inorgnic clays, PA6 containing OATP (PA6/OATP) showed an obvious flame retradant. An ARES rheomete was used to furtherly reveal the relationship between structure and property of PA6/OATP, the results indicated that polymer chain movement was inhibited at the presence of OATP, the thermal and mechanical properties were reinformed in macrocosm.2. Inorganic and organic encapsulated red phosphorus were carried on with magnesium hydroxide and phenolic resin by sol-gol method, respectively. The influences of reaction conditions on encapsulation were studied. Through deposition or macromolecule network gel was obtained in aqueous solution, uniform layer of encapsulation was formed on red phosphorus surface. The samples were characterized by XPS, TGA and DTA. The results indicated that phosphorus content on surface of microencapsulated phosphorus reduced greatly, and self-ignite point rised by 100℃. Moreover, to some extent, surface and interface tension of red phosphorus powders modified by phenolic resin decreased. The compatibility between inorganic and organic phase was improved, which was beneficial to application of red phosphorus in resin materials.The properties of flame retardancy and mechanical aspact were studied on PA6 containing red phosphorus microencapsulated by phenolic resin. The results indicated that oxygen indexes were improved greatly at the addition of red phosphorus. When the addition comes to 15 percents, oxygen index could pass UL94V-0 rank. But the addition of red phosphorus had a small effect on mechanical properties.