Effect of β-nucleating Agent on Properties of Polypropylene
The polypropylene(PP)was modified by β-nucleating agent to prepare PP masterbatch with the β-nucleating mass fraction of 5%.The PP masterbatches are then injection molded with PP in various ratios to form PP standard test specimens,which are subsequently subjected to mechanical property testing.The results showed that the β-nucleating agent had a significant toughening effect on the homopolymer PP 1100N.When the mass fraction of β-nucleating agent is 0.02%,the notched impact strength at room temperature increases from 5.0 kJ/m2 to 9.1 kJ/m2,with an increase of 82%.At a mass fraction of 0.15%,the notched impact strength at room temperature reaches its maximum,increasing from the original 5.0 kJ/m2 to 11.5 kJ/m2,with an increase of 130%.The low-temperature impact strength also increases with the addition of β-nucleating agents,from 2.0 kJ/m2 to 2.6 kJ/m2,with an increase of 30%.The incorporation of β-nucleating agents affects the tensile properties of the material.At a mass fraction of 0.05%of β-nucleating agent,the tensile strength reaches a maximum of 30.98 MPa,which is a 13.27%increase in tensile strength compared to the blank sample without addition,and the elongation at break also increases from 708.95%to over 1 060.00%.The addition of β-nucleating agents affects the bending properties of the material and reduces its rigidity,but the impact is not significant.
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