Effect of Thermal Oxygen Aging on the Structure and Properties of Maleic Anhydride Grafted Polypropylene
The effect of maleic anhydride grafted polypropylene(PP-g-MAH)on the properties of glass fiber reinforced polypropylene materials and the effect of thermal oxygen aging on the molecular structure and properties of PP-g-MAH were studied.The results show that the self-made PP-g-MAH significantly improves the mechanical properties of 30％glass fiber reinforced polypropylene material.With the prolongation of thermal oxygen aging time,the MFR of PP-g-MAH continues to increase,and the improvement effect on the mechanical properties of glass fiber reinforced polypropylene materials continues to decrease.According to the analysis of gel chromatograph(GPC),infrared spectrum(IR)and maleic anhydride(MAH)grafting rate measurement results,the thermal oxidative aging process does not have a significant impact on the maleic anhydride of the PP molecular link branch,but causes the fracture of the polypropylene molecular chain,resulting in the decrease of PP-g-MAH molecular weight,resulting in the decline of its own mechanical properties,and the decline of the interface strength between PP and glass fiber.The improvement effect of PP-g-MAH on the mechanical properties of glass fiber reinforced polypropylene materials is reduced.
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