Study on Effect of Different Nucleating Agents on Properties of Polypropylene
In this paper,the effects of four different types of nucleating agents,namely,α-nucleating agent CH-6N,HPN-715,TMP-7 and β-nucleating agent TMB-5,as well as the effects of compounding of different types of nucleating agents on the mechanical,optical and crystalline properties of polypropylene were investigated.The results show that the nucleating agent can effectively increase the crystallization temperature and crystallinity.α-nucleating agent CH-6N has the best rigidity effect.The bending modulus and bending strength of polypropylene are 2 390 MPa and 60.6 MPa respectively with the addition of 0.2% CH-6N.The α nucleating agent can reduce the toughness of polypropylene.Adding 0.2% CH-6N,the impact strength of polypropylene is only 2.7 kJ/m2.The β-nucleating agent TMB-5 can effectively improve the toughness of polypropylene,but reduce the rigidity.The toughening effect of 0.1% TMB-5 is the best.The impact strength of polypropylene is 20.7 kJ/m2,and the elongation at break is 530% .In terms of optical properties,α nucleating agent CH-6N has the best modification effect,and after the addition of 0.1% CH-6N,the yellow index of polypropylene is only 0.46.The combination of α nucleating agent and β nucleating agent can not only improve the toughness of polypropylene,but also improve its rigidity,and achieve the balance of rigidity-toughness.The compound modification effect of 0.1% CH-6N and 0.1% TMB-5 is good,and the impact strength of polypropylene is 5.5 kJ/m2,the bending modulus is 2 140 MPa,and the tensile strength is 41.1 MPa.
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