聚全氟乙丙烯改性超高分子量聚乙烯的性能研究

以纯超高聚乙烯(UHMWPE)为基础原料,添加高密度聚乙烯、乙烯-丙烯酸酯共聚物、纳米SiO₂等改性剂,制备了UHMWPE改性混合物。研究了聚全氟乙丙烯(FEP)的加入和用量,对UHMWPE改性混合物力学性能及磨耗性能、熔融性能及热性能的影响。结果表明:添加FEP前后,改性混合物体系中纳米粒子都有较好的分散,拉伸强度和冲击强度以及热性能变化不大,但添加FEP后聚合物体系的磨耗几乎下降了50%,熔融性有一定的改善。当FEP用量较少时,随着FEP用量的增加,改性混合物的拉伸强度和冲击强度都上升;当FEP用量超过2%时,随着随着FEP用量的增加,改性混合物的拉伸强度和冲击强度都下降;在FEP用量达到2%时,改性混合物的磨耗是最低的。

Performance study on the ultra-high molecular weight polyethylene modified using FEP

Using ultra-high molecular weight polyethylene(UHMWPE)as the base material,The UHMWPE modified mixture was prepared by adding high-density polyethylene,ethylene-acrylate copolymer,nano SiO₂and other modifiers.According to UHMWPE modified mixture,study has been done about FEP addition and dosage how to effect mechanical properties,wear properties,melt properties and thermal properties of the polymer systems.Results show that before and after FEP added,nanoparticles have good dispersion in the polymer systems;Tensile strength and impact strength as well as thermal properties have little change;Wear properties almost felled 50%,and melt properties improved a little.When FEP was small amount,tensile strength and impact strength of the polymer systems was rising as FEP scales up;when the percentage of FEP is above 2%,tensile strength and impact strength of the polymer systems was falling as FEP scales up.Wear properties of the polymer systems were lowest when the percentage of FEP is 2%.