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使用脲醛(Urea-formaldehyde)树脂-环氧树脂微胶囊(E-51)和三聚氰胺-尿素-甲醛共缩聚树脂(Melamine-urea-formaldehyde)-环氧树脂微胶囊(E-51)制备微胶囊/环氧树脂复合材料样品。对其力学性能进行了测试,并对复合材料的断面形貌进行了观察,研究了微胶囊对微胶囊/环氧树脂复合材料力学性能的影响。结果表明:随着微胶囊用量的增加,复合材料拉伸强度和弯曲强度有所降低;微胶囊质量分数小于2%时,复合材料断裂伸长率和断裂弯曲应变有所提高;大于2%时复合材料断裂伸长率和断裂弯曲应变下降。微胶囊对环氧树脂有增韧效果,微胶囊表面越粗糙,粒径越小,增韧效果越明显。在裂纹扩展区,大部分微胶囊破裂,裂纹终止区,大部分微胶囊剥离。
The preparation of microcapsules by using urea-formaldehyde resin-epoxy resin microcapsule (E-51) and melamine-urea-formaldehyde-epoxy resin microcapsule (E-51) Epoxy resin composite samples. The mechanical properties of the composites were tested, and the cross-sectional morphology of the composites was observed. The effect of microcapsules on the mechanical properties of microcapsules / epoxy composites was studied. The results showed that the tensile strength and flexural strength of the composites decreased with the increase of the microcapsule dosage. When the microcapsule mass fraction was less than 2%, the elongation at break and the flexural strain at break were increased. When the microcapsule content was more than 2% The fracture elongation and fracture bending strain of composites decrease. The microcapsules have the toughening effect on the epoxy resin, the more rough the microcapsule surface, the smaller the particle size, the more obvious the toughening effect. In the crack growth zone, most of the microcapsules were cracked and the crack was terminated. Most of the microcapsules were peeled off.