辐照增容高密度聚乙烯/无机粒子填充体系的研究

【作者】 范萍；

【导师】 徐闻；

【作者基本信息】 四川大学 ， 高分子材料， 2001， 硕士

【摘要】 本文采用γ射线和电子束辐照在聚乙烯主链上引入含氧极性基团，增加了HDPE与无机粒子的界面相容性，通过优选界面增容剂进一步增强了γ-HDPE与白云母的相容性。并针对增强增韧体系所存在的老化及分散问题进行了初步探讨。研究了界面增容剂对γ-HDPE/白云母力学性能的影响，通过SEM对该体系的形态结构进行了研究，探讨了界面增容剂的作用：研究了粒径对γ-HDPE/白云母填充体系力学性能的影响；采用超声作用改善无机粒子在聚乙烯中的分散状态；并对辐照聚乙烯及辐照聚乙烯/绢英粉共混体系的老化性能进行了初步探讨。结果表明：1．辐照增容方法适用于γ-HDPE/白云母体系，使该体系同时获得增强增韧效果。含有NH₂的双官能团试剂对γ-HDPE/白云母填充体系的界面有明显的增容效果，能使体系的强度和韧性均得到较大提高。2．粒径对γ-HDPE/白云母填充体系的力学性能有显著影响。在本实验条件下，含有40％、3μm的白云母粒子可使γ-HDPE/白云母/增容剂体系的屈服强度达到30.MPa，缺口冲击强度达到388J/m，分别为原料树脂的124％和185％2．超声波可促进无机粒子的分散，使γ-HDPE/无机粒子填充体系的力学性能提高。在本实验条件下，超声处理的最佳时间为20min，最佳功率为200W。3．辐照增容HDPE/STC材料的抗热氧老化性能较好。在热氧加速老化条件下，当热老化时间达到168h时，e-6098/STC体系的力学性能变化不大。材料有望用于对抗热氧老化性能无特殊要求的领域。4．在紫外光加速老化条件下，当老化时间达到168h时e-HDPE/STC体系的冲击强度与断裂伸长率较e-HDPE下降幅度较大。在要求材料具有耐紫外光老化性能的领域，需要提高e-HDPE/STC/F体系的抗光氧老化能力更多还原

【Abstract】 Through y-ray and electron beam irradiation, some oxygen containing groups can be introduced onto the molecular chain of HDPE to increase the affinity of HDPE and inorganic fillers. When an optimized compatibilzer is used, the affinity between irradiated HDPE and fillers could be further improved. The effects of the compatibilizer and the particle size of fillers on the mechanical properties of irradiated HDPE/inorganic fillers were studied. Ultrasonic was adopted to improved the dispersion of inorganic fillers in HDPE. Anti-aging property of irradiated HDPE/STC was investigated as well.1. The y-ray irradiation could be a effective way to improve the affinity of HDPE/muscovite blend. In case a bifunctional -NHa containing compatiblizer is utilized, the affinity could be further improved. Both stiffness and toughness of the blend can be increased greatly. The particle size of muscovite has a notable effect on the mechanical properties of the y-HDPE/muscovite blend. A thorough study shows that, compared with HDPE, the yield and notched Izod impact strength of Y -HDPE/muscovite (60/40, 3 u m) are increased to 32.8 MPa and 388 J/m from 24.2 MPa and 210 J/m respectively.2. The dispersion of inorganic fillers in HDPE could be better after ultrasonic pre-treating. And better mechanical properties could be achieved. The optimum ultrasonic pre-treating time is 20 min, the optimum ultrasonic power is 200 W.3. The e-HDPE/STC blend has good anti-aging properties. After heat ageing for 168 hours, the mechanical properties of e-6098/STC almost have no change. It is also found that the impact strength and break-elongation of the blend will decrease when it is exposed to u.v. light. A further research is needed to be conducted to improve the material’s anti-photo-oxidation properties.更多还原