| With" little size effect" , "surface effect"and"quantum effect", Inorganic nanoparticle has mang special properties which different from other particles.Modification of plastics by inorganic nanoparticles, excellent performance polymer/inorganic nanoparticles composities which conbinate higher rigidity, heat resistance and size stability of inorganic filler with good toughening, dielectric and process ability of polymer can be got. In this present thesis,the effect of nanometer TiO2. Montmorllonite on the properties of HIPS , ABS, PA6 and PA66 are carried out theoretically and experimentally in a systemetic way. The main content can be concluded as follows:1. HIPS/nano-TiO2/TAS nanocompo sites have been prepared for the first time by surface pretreatment of nano-TiO2; selecting special macromolecule dispersing agent ( TAS) and master batch manufacturing technlogy. The effect of nano-TiO2 content and its surface treatment on the mechanical properties, thermal property, rheological behaviour, flame- retardancy, heat aging behaviour of HEPS/nano-TiO2/TAS composites have been studied in detail. The optimum content of nano-TiO2 that have both reinforceing and tougening effect on HIPS, The component ritio and manufactory technlogy which HIPS/nano- TiO2/TAS have optimum comprehensive, heat resistance, flame- retardancy anti-aging and surface property of HIPS/nano-TiO2/TAS composites are better than those of HIPS.2. The dispersing behaviour and dispersing law of nano-TiO2 in HEPS were studied. It is found that the particle size of nano -TiO2 rises up as content of coupling and nano-TiO2 is in creased,or as shear rate is decreased.The relation between nano-TiO2 content,surface treatment and processing parametes with properties of nanocomposites have been established.Some key problems of plastics modification by nanoparticles as well as its solving ways and measures were put forward.3. Application of MTT and MTT/POE-MAH two components on modification of PA6 and PA66 were studied in systematic way. A seires of composites of PA6/MTT PA6/MTT/POE-MAH ,PA66/MTT/and PA66/MTT/POE-MAH which comprehensive propertis be improved have been prepared. The recationship between content of MTT or MTT and POE-MAH with properties of those composites are analyzed and discussed by using some analytical technipues such as DSC,XRD and SEM.4. This thesis make a deep and systematic study for application of nano-TiO2 andMTT on modification of ABS. The relationship between content of nano- TiO2 and MMT with properties of composites are also sum up. some micro-structional models of nanoparticles dispersing in ABS are proposed. Those models can explan satistactorily relationship between properties and struction of ABS/nanoparticles.Experiment result show that the flame-retardancy and anti-aging properties of ABS/MTT composites have been improved.5.PA6/PP/POE-MAHandPA6/PP/POE-MAH alloys have prepared by melt blend. The effect of component ritio on mechanical properties and water absorbtion of alloys are carried out in a systematic way. low water absorbtion and high performance of PA6/PP/POE-MAH and PA66/PP/POE- MAH are prepared succeedly. The influence of POE- MAH on microscopic struction, crystalline behaviour and compatibility of blends are explored by using SEM.DSC and XRD,etc.6. "Cracz and crack transfer mutually"mechanism of reinforcing and toughening of plastics modified by nanoparticles are proposed for the first time. The reliability of this mechanism are explained by means of theoretical and experimental foundation. This mechanism describle accurately act behariour of nanoparicle dispersed in polymer matrix and unify successfully many different mechanism about reinforcing and toughening of polymer modified by nanoparicles.This mechanism supply a theoretical solution of application of polymers modified by nanoparticles.
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