Study on Modification of Polypropylene

Adding inorganic or organic substances or blending different types of high-molecular polymers by physical and mechanical methods or using chemical methods to achieve copolymerization, grafting, cross-linking, block of high polymers or combining the above methods In order to reduce the cost of materials, improve molding processability or end-use performance, or make materials have unique functions such as surface, electricity, magnetism, light, heat, sound, combustion, etc., collectively referred to as polymer modification.

Polypropylene is a thermoplastic general-purpose plastic with very comprehensive properties. It has the characteristics of easy processing, low density, and low production costs. Therefore, polypropylene has been widely used in household appliances, daily packaging materials, and the automotive industry. One of the fastest growing plastics in recent years. However, polypropylene also has disadvantages: poor creep resistance, low melting point, poor dimensional stability, low thermal deformation temperature, low temperature brittleness, etc., which restricts its application as engineering stress materials.

Glass fiber reinforced polypropylene can increase the range of use of the material. The glass fiber is a high temperature resistant material, so the heat resistance of the material is improved. At the same time, glass fiber is a high-strength material that can improve the strength and impact properties of plastics.

The surface of glass fiber is coated with silane coupling agentto enhance interfacial compatibility. In the application process, the interface bonding strength of glass fiber reinforced polypropylene composites was improved by using a maleic anhydride-grafted polypropyleneas a compatibilizer, thereby improving the mechanical properties of the composites. The grafting of maleic anhydride with an appropriate amount of high-fusing polypropylene can greatly improve the fluidity of polypropylene and can fully impregnate glass fibers. At the same time, the grafting of polypropylene with maleic anhydride can significantly improve the interface compatibilization effect of composite materials. These two effects can make glass fiber reinforced polypropylene materials with good appearance and excellent performance. The higher the maleic anhydride grafting rate of the compatibilizer, the stronger the reactivity and the better the compatibilizing effect on the interface of the composite material.