Preparation And Properties Of Composite Materials: Modified Glass Fiber Filled UHMWPE

Ultra-high molecular weight polyethylene (UHMWPE) materials has its inherentadvantages, such as good tensile performance, superior wear resistance and impact resistance,resistance to chemical corrosion, etc., but also has its disadvantages such as low surface hardness,poor formability. Blending can be used to improve the performance of the polymer, reduce thecost of materials and obtain new properties, is a kind of effective modification technology.In thispaper, glass fiber (GF) is used to modify UHMWPE materials, with purpose to maintaining thegood performance of UHMWPE, exploring new ways of mixing and optimizing thecomprehensive mechanicalproperties of materials. Mould pressing craft of the way is studied atthe same time. The concrete contents and conclusions are list as follows:Using orthogonal experiment method to study the factors of GF/UHMWPE composites:Within the scope of the length to diameter ratio is less than42.5, filler content has the greatestinfluence on the properties ofcomposite material, the length to diameter ratio second, GF treatedwith coupling agent performs better than no coupling agent treatment, and with KH570effectbetter. On this basis, the most combination is obtained, namely the length to diameter ratio of18to25of the GF and treated with KH570, modified in accordance with the GF: UHMWPE=1:9made tensile properties and wear resistance of GF/UHMWPE composites for optimal. Specificas follows: the tensile strength is31.8MPa, the elongation at break is428.2%, wear rate is0.58%by mass.Modified glass fiber (GF) filled UHMWPE composites were prepared via in-situpolymerization of vinyl acetate(VAc) and methyl iso-octyl methacrylate(EHMA). The effects ofthe mass ratio of monomer and GF, the aspect ratio of GF, coupling selection and the fillercontent on the mechanical properties were studied. When the aspect ratio of GF is4.8-5.3:1,pretreated byKH550, Mm (monomer mass): Mg (GF mass)=1:4in situ polymerization, and10%addition of modified GF, the GF/VAc-g-EHMA composite show the highest values ofmechanical properties, tensile strength31.3MPa, elongation at break is435%, the wear ratelower than0.14%by mass. The SEM results show good bonding quality between the GF andthe matrix. Analysis by infrared spectroscopy, bonding manner between the filler and the matrixwere also further investigated.Optimized the mould pressing craft of the GF filled UHMWPE composites: as to4mmproducts, preloading under8MPa, and then15MPa for60-70min, moulded in mouldingtemperature under230℃and then water stripping is advisable.