摘要: PP resin, with excellent physical and mechanical performance, has been widelyused in the automotive industry, household electrical appliances and manyother fields.But the PP resin with poor toughness, especially the brittleness un... 展开 PP resin, with excellent physical and mechanical performance, has been widelyused in the automotive industry, household electrical appliances and manyother fields.But the PP resin with poor toughness, especially the brittleness under the lowtemperature condition, limits its further use and development.Polyolefin elastomer (POE) has many performance and price advantage in theaspect of modification of polypropylene compared with EPR, EPDM, SBS.ThePOE/PP composites may have more potential on car bumpers, interior trim panels etc.In this thesis, the impact toughness, tensile strength, elongation at break, melt indexand shore hardness of POE/PP composites with different POE content were studied.Results show that POE can significantly improve the impact toughness, andelongation at break of the POE/PP system, while the flow ability, tensile strength,impact strength, melt index and shore hardness decreased with the increase of POE,and the best adding quantity of POE should be controlled between 15-20 wt.％. The inorganic nano particles toughened polypropylene can produce moremicro-cracks and absorb more impact energy by external impact force with thedecrease of the inorganic nanometer particle size, increase of the inorganicnanoparticles' dispersion, expand the inorganic nanoparticles' specific surface area,and increase the contact area filler and matrix.But in another aspect, the inorganicnano particles can also lead the microcracks of toughened polypropylene to developinto macro cracking or complete break to prompt composite material performancedegradation with too much inorganic nanoparticles, especially when the inorganicnanoparticles' surface without coupling agent and prone to reunite phenomenon. Therefore, the modification of the inorganic nanoparticles before filling is also veryimportant.In this thesis, silane coupling agent KH-570 was used to modification thesurface chemical properties of nanometer calcium carbonate nano-CaCO3, and thenthe modified nano-CaCO3 was used to blend with the POE/PP composite.The FT-IRof KH-570 modified nano-CaCO3, fracture surface, impact toughness, tensile strength,and elongation at break of KH-570 modified nano-CaCO3/POE/PP composites withdifferent modified nano-CaCO3 content were studied.The results show that the silanecoupling agent KH-570 modified nano-CaCO3 can effectively improve the disperse ofnano-CaCO3 in the POE/PP resin matrix.KH-570 modified nano-CaCO3, a rigidinorganic filler, was blended with the POE/PP resin to improve the tensile and impactstrength, and at the same time the composite can maintain reasonable elongation atbreak property.The tensile and impact strength of the KH-570 modifiednano-CaCO3/POE/PP composite, especially with 15wt.％ KH-570 modifiednano-CaCO3, can reach 22.5 MPa and 32 KJ·m-2, which increased about 14 ％ and31％ respectively compared with the pure 20 wt.％ POE/PP composite. As an excellent β-nucleating agent, PA-10 was used to improve the crystallinityof the PP/POE.The mechanical properties and thermostability of thenano-CaCO3/POE/PP composite was correspondingly changed with the fedding ofPA-10.The β-nucleating agent PA-10 modified nano-CaCO3/POE/PP compositeswere studied.The WXRD tests show that 0.3 wt.％ PA-10/PP with perfectβ-modification and the α-modification was still exist.The WXRD tests show thatperfect β-modification is avaible with 0.3 wt.％ PA-10/PP fedding together with theexisting of α-modification.PA-10 can slightly lower the tensile strength of KH-570modified nano-CaCO3/POE/PP composite with the additive amount of 0.3 wt.％,while the impact strength and thermal deformation vicat softening point temperatureof PA-10/nano-CaCO3/POE/PP composite increased 10.3 ％ compared with thePOE/PP composite. 收起