纳米铜改性酚醛树脂及其应用性能

采用新发明的原位生成法成功地制备了摩擦材料用纳米铜改性酚醛树脂。利用XRD和TEM对所制备的树脂进行了表征。结果显示,纳米铜的粒径为10~40 nm,呈近球形。进行了TGA、冲击试验和摩擦试验。结果表明,纳米铜改性酚醛树脂的耐热性有较大提高,与纯酚醛树脂相比,其初始分解温度和半分解温度可分别提高31℃和46℃;纳米铜改性酚醛树脂基摩擦材料的韧性和摩擦学性能有明显改善,与纯酚醛树脂基摩擦材料相比,冲击强度提高44%,热衰退率和磨损率分别降低约50%和2/3。建立了酚醛树脂/纳米铜复合材料的界面模型,并探讨了纳米铜改善酚醛树脂及摩擦材料性能的机理。

PHENOLIC RESIN MODIFIED BY NANO-COPPER AND ITS APPLIED BEHAVIORS

The phenolic resin(PF) modified by nano-copper, used in friction materials, was successfully prepared by in situ producing method invented newly. The prepared resin was characterized by XRD and TEM. The results show that the nano-copper particles are well dispersed in PF in diameter of 10~40 nm, and in spherical geometry. The results of TGA, impacting tests and friction and wear experiments indicate that the heat-resistance of the modified PF can be greatly raised. Compared with those of the pure PF, the initial decomposing and the half decomposing temperature rise by 31℃and 46℃, respectively; The toughness and tribological properties of the modified PF could be distinctly improved. Compared with those of the pure PF, the impact strength increases by 44%, the heat-fade rate and wear rate reduce by 50% and 2/3, respectively. The interfacial model of the phenolic resin / nano-copper composite was proposed. The mechanisms were discussed, that the properties of phenolic resin and friction materials are improved by nano-copper.