Preparation, Structure And Properties Of Glass Bead Filled Polyolefin Composites

Polyolefin are always the most important products of organic polymer materials, but the mechanical properties of polyolefin, especially in toughness, strength, hardness and modulus, are somewhat worse than engineering plastics, which limits the application range. How to realize the high performance with special property and low cost is one of most important research field of polymer science and engineering in 21st century. In 1980's, inorganic rigid particles toughened polymers sparking the interests of researchers in polymer science. As newly inorganic rigidity particles, glass bead (GB) is paid more attention by material scientists in modifying polyolefin research field.This work covers an overall mechanical properties of glass bead filled polyolefin(PP PE). Glass bead with small particle size have approximate invariant influence on tension strength, which obviously falls down at 10m of particle size. Glass bead with small particle size is beneficial to composites toughness. Glass bead with different content filled LLDPE, the impact strength of composites is improved and keep increasing with definite glass bead content. Filling two different glass beads to PP resin, the mechanical properties are enhanced, notch impact strength and extension at break increase at 50% than pure PP resin.Rheological properties of GB/ polyolefin system are researched. The results of melt flow rate (MFR) indicate that processing method, content of glass bead and particle size are all making influence on MFR, of which glass bead content is larger than particle size, and MFR value at the condition of double-screw processing is higher than that of single-screw processing method. Torque rheological performance indicates that plastication torque of GB/LLDPE system firstly decreases, and gradually increases with filling glass bead. The balance torque and processing energyconsumption are decreased with filling glass bead. The glass bead size has little influence on torque rheological performance. Plastication torque, balance torque and processing energy consumption at the condition of single-screw processing are larger than those of double-screw processing condition. For GB/PP system, processing methods have obviously influenced on torque rheological performance. Glass bead filled with PP and PE are pseudoplastic fluid system. At the range of researched glass bead size, particle diameter has little influence on apparent viscosity of materials. The viscosities of composites are obviously different between single-screw processing and double-screw processing method.Using the mathmatic fromula to validate the experiment results of mechnical properties of GB/PP and GB/LLDPE composites, which show the concordance at modulus using Ishai model. The tensile strength presents better conformity adopting Nicolais-Narkis and Pukzansky formula.When filling glass bead to different resin matrix, the melt and crystallization process of materials take a totally difference. The properties of composites are somewhat related to the filler influence on materials crystallization behavior.Essential work of fracture (EWF) method is adopted to value the fracture toughness of GB/polyolefin system. In general, specific essential work of fracture, we, is lower than that of pure resin, glass bead with different particle size filling resin matrix makes little influence on value of we. The we of GB/PP system is higher than that of PP at glass bead with 5000 meshes, and different with GB/PE system to this point. Specific non-essential work of fracture, wp, is decreasing with filling glass bead, and higher than pure polyolefin at relatively low content of glass bead.